[1] [1] Song H, Liu J, Lu H Y, Chen C and Ba L 2020 High sensitive gas sensor based on vertical graphene field effect transistor Nanotechnology 31 165503

[2] [2] Zhou M L, Chen X H, Zhang L J and Zeng W 2020 High performance novel gas sensor device for site environmental protection using Ti0.5Sn0.5O2 nanomaterials J. Nanoelectron. Optoelectron. 15 1423–8

[3] [3] Zhou J, Li P, Zhang S, Long Y C, Zhou F, Huang Y P,Yang P Y and Bao M H 2003 Zeolite-modified microcantilever gas sensor for indoor air quality control Sens. Actuators B 94 337–42

[4] [4] Matindoust S, Baghaei-Nejad M, Shahrokh Abadi M H,Zou Z and Zheng L R 2016 Food quality and safety monitoring using gas sensor array in intelligent packaging Sens. Rev. 36 169–83

[5] [5] Guo H D, Li X W and Qiu Y B 2020 Comparison of global change at the Earth’s three poles using spaceborne Earth observation Sci. Bull. 65 1320–3

[6] [6] Zhang X, Li C L and Li L F 2022 In situ detection technology for deep sea extreme environment: research status and strategies Bull. Chin. Acad. Sci. 37 932–8

[7] [7] Wieler R and Heber V S 2003 Noble gas isotopes on the Moon Space Sci. Rev. 106 197–210

[8] [8] Mahaffy P R et al 2015 The neutral gas and ion mass spectrometer on the Mars atmosphere and volatile evolution mission Space Sci. Rev. 195 49–73

[9] [9] Liu J, Sun F X, Zhang F, Wang Z, Zhang R, Wang C and Qiu S L 2011 In situ growth of continuous thin metal–organic framework film for capacitive humidity sensing J. Mater. Chem. 21 3775–8

[10] [10] Zhou Y, Lin X G, Wang Y, Liu G Q, Zhu X Y, Huang Y K,Guo Y C, Gao C and Zhou M 2017 Study on gas sensing of reduced graphene oxide/ZnO thin film at room temperature Sens. Actuators B 240 870–80

[11] [11] Alfano B, Polichetti T, Mauriello M, Miglietta M L,Ricciardella F, Massera E and Di Francia G 2016 Modulating the sensing properties of graphene through an eco-friendly metal-decoration process Sens. Actuators B 222 1032–42

[12] [12] Zhu Q Q, Gu D, Liu Z, Huang B Y and Li X G 2021 Au-modified 3D SnS2 nano-flowers for low-temperature NO2 sensors Sens. Actuators B 349 130775

[13] [13] Li X L, Lou T J, Sun X M and Li Y D 2004 Highly sensitive WO3 hollow-sphere gas sensors Inorg. Chem. 43 5442–9

[14] [14] Wang X N, Sun X L, Hu P A, Zhang J, Wang L F, Feng W,Lei S B, Yang B and Cao W W 2013 Colorimetric sensor based on self-assembled polydiacetylene/graphene-stacked composite film for vapor-phase volatile organic compounds Adv. Funct.Mater. 23 6044–50

[15] [15] Wang L Y 2020 Metal-organic frameworks for QCM-based gas sensors: a review Sens. Actuators A 307 111984

[16] [16] Vashist S K and Vashist P 2011 Recent advances in quartz crystal microbalance-based sensors J. Sens. 2011 571405

[17] [17] O’Sullivan C K and Guilbault G G 1999 Commercial quartz crystal microbalances—theory and applications Biosens.Bioelectron. 14 663–70

[18] [18] Chang A, Li H Y, Chang I N and Chu Y H 2018 Affinity ionic liquids for chemoselective gas sensing Molecules 23 2380

[19] [19] Li D S, Xie Z H, Qu M J, Zhang Q, Fu Y Q and Xie J 2021 Virtual sensor array based on butterworth-van Dyke equivalent model of QCM for selective detection of volatile organic compounds ACS Appl. Mater. Interfaces13 47043–51

[20] [20] Tang Y L, Xu X F, Han S B, Cai C, Du H R, Zhu H, Zu X T and Fu Y Q 2020 ZnO-Al2O3 nanocomposite as a sensitive layer for high performance surface acoustic wave H2S gas sensor with enhanced elastic loading effect Sens.Actuators B 304 127395

[21] [21] Tang Y L, Xu X F, Du H R, Zhu H, Li D J, Ao D Y, Guo Y J,Fu Y Q and Zu X T 2020 Cellulose nano-crystals as a sensitive and selective layer for high performance surface acoustic wave HCl gas sensors Sens. Actuators A 301 111792

[22] [22] Li M et al 2019 Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior Sens.Actuators B 287 241–9

[23] [23] Li H et al 2019 Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films Surf. Coat. Technol.362 78–83

[24] [24] Park W, Park J, Jang J, Lee H, Jeong H, Cho K, Hong S and Lee T 2013 Oxygen environmental and passivation effects on molybdenum disulfide field effect transistors Nanotechnology 24 095202

[25] [25] Fahad H M, Gupta N, Han R, Desai S B and Javey A 2018 Highly sensitive bulk silicon chemical sensors with sub-5nm thin charge inversion layers ACS Nano 12 2948–54

[26] [26] Hong S, Wu M L, Hong Y, Jeong Y, Jung G, Shin W, Park J,Kim D, Jang D and Lee J H 2021 FET-type gas sensors: a review Sens. Actuators B 330 129240

[27] [27] Wu Z L, Li Z J, Li H, Sun M X, Han S B, Cai C, Shen W Z and Fu Y Q 2019 Ultrafast response/recovery and high selectivity of the H2S gas sensor based on α-Fe2O3 nano-ellipsoids from one-step hydrothermal synthesis ACS Appl. Mater. Interfaces 11 12761–9

[28] [28] Khan A H, Rao M V and Li Q L 2019 Recent advances in electrochemical sensors for detecting toxic gases: NO2,SO2 and H2S Sensors 19 905

[29] [29] Fergus J W 2007 Solid electrolyte based sensors for the measurement of CO and hydrocarbon gases Sens.Actuators B 122 683–93

[30] [30] Dubbe A 2003 Fundamentals of solid state ionic micro gas sensors Sens. Actuators B 88 138–48

[31] [31] Ji H C, Zeng W and Li Y Q 2019 Gas sensing mechanisms of metal oxide semiconductors: a focus review Nanoscale11 22664–84

[32] [32] Kumar R, Liu X H, Zhang J and Kumar M 2020 Room-temperature gas sensors under photoactivation:from metal oxides to 2D materials Nano-Micro Lett.12 164

[33] [33] Nikolic M V, Milovanovic V, Vasiljevic Z Z and Stamenkovic Z 2020 Semiconductor gas sensors:materials, technology, design, and application Sensors20 6694

[34] [34] Penza M, Rossi R, Alvisi M, Signore M A, Cassano G,Dimaio D, Pentassuglia R, Piscopiello E, Serra E and Falconieri M 2009 Characterization of metal-modified and vertically-aligned carbon nanotube films for functionally enhanced gas sensor applications Thin Solid Films517 6211–6

[35] [35] Bekyarova E, Davis M, Burch T, Itkis M E, Zhao B,Sunshine S and Haddon R C 2004 Chemically functionalized single-walled carbon nanotubes as ammonia sensors J. Phys. Chem. B 108 19717–20

[36] [36] Yin F F, Yue W J, Li Y, Gao S, Zhang C W, Kan H, Niu H S,Wang W X and Guo Y J 2021 Carbon-based nanomaterials for the detection of volatile organic compounds: a review Carbon 180 274–97

[37] [37] Zou Q Q, Liu B and Zhang Y 2023 Design of an array structure for carbon-based field-effect-transistor type gas sensors to accurately identify trace gas species J. Mater.Chem. A 11 15811–20

[38] [38] Zhao Q N, He Z Z, Jiang Y D, Yuan Z, Wu H R, Su C L and Tai H L 2019 Enhanced acetone-sensing properties of PEI thin film by GO-NH2 functional groups modification at room temperature Front. Mater. 5 82

[39] [39] Nalage S R, Navale S T, Mane R S, Naushad M, Stadlar F J and Patil V B 2015 Preparation of camphor-sulfonic acid doped PPy–NiO hybrid nanocomposite for detection of toxic nitrogen dioxide Synth. Met. 209 426–33

[40] [40] Liu X H, Zheng W, Kumar R, Kumar M and Zhang J 2022 Conducting polymer-based nanostructures for gas sensors Coord. Chem. Rev. 462 214517

[41] [41] Fratoddi I, Venditti I, Cametti C and Russo M V 2015 Chemiresistive polyaniline-based gas sensors: a mini review Sens. Actuators B 220 534–48

[42] [42] Chen X W, Wang S, Su C, Han Y T, Zou C, Zeng M, Hu N T,Su Y J, Zhou Z H and Yang Z 2020 Two-dimensional Cd-doped porous Co3O4 nanosheets for enhanced room-temperature NO2 sensing performance Sens.Actuators B 305 127393

[43] [43] Duan Z H, Zhao Q N, Li C Z, Wang S, Jiang Y D, Zhang Y J,Liu B H and Tai H L 2021 Enhanced positive humidity sensitive behavior of p-reduced graphene oxide decorated with n-WS2 nanoparticles Rare Met. 40 1762–7

[44] [44] Zheng W, Liu X H, Xie J Y, Lu G C and Zhang J 2021 Emerging van der Waals junctions based on TMDs materials for advanced gas sensors Coord. Chem. Rev.447 214151

[45] [45] Meng H, Yang W, Ding K, Feng L and Guan Y 2015 Cu2O nanorods modified by reduced graphene oxide for NH3 sensing at room temperature J. Mater. Chem. A3 1174–81

[46] [46] Li E, Cheng Z X, Xu J Q, Pan Q Y, Yu W J and Chu Y L 2009 Indium oxide with novel morphology: synthesis and application in C2H5OH gas sensing Cryst. Growth Des.9 2146–51

[47] [47] Guo Y J et al 2013 Characterization and humidity sensing ofZnO/42? YX LiTaO3 Love wave devices with ZnO nanorods Mater. Res. Bull. 48 5058–63

[48] [48] J L Z et al 2019 Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature Mater. Horiz. 6 470–506

[49] [49] J L D et al 2019 High humidity enhanced surface acoustic wave (SAW) H2S sensors based on sol–gel CuO films Sens. Actuators B 294 55–61

[50] [50] Li Z J, Huang Y W, Zhang S C, Chen W M, Kuang Z,Ao D Y, Liu W and Fu Y Q 2015 A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit J. Hazard. Mater.300 167–74

[51] [51] Li Z J, Lin Z J, Wang N N, Huang Y W, Wang J Q, Liu W,Fu Y Q and Wang Z G 2016 Facile synthesis of α-Fe2O3 micro-ellipsoids by surfactant-free hydrothermal method for sub-ppm level H2S detection Mater. Des. 110 532–9

[52] [52] Xu Y S, Ma T T, Zhao Y Q, Zheng L L, Liu X H and Zhang J 2019 Multi-metal functionalized tungsten oxide nanowires enabling ultra-sensitive detection of triethylamine Sens.Actuators B 300 127042

[53] [53] Su P G, Shiu W L and Tsai M S 2015 Flexible humidity sensor based on Au nanoparticles/graphene oxide/thiolated silica sol–gel film Sens. Actuators B 216 467–75

[54] [54] Liu C, Kuang Q, Xie Z X and Zheng L S 2015 The effect of noble metal (Au, Pd and Pt) nanoparticles on the gas sensing performance of SnO2-based sensors: a case study on the {221} high-index faceted SnO2 octahedra CrystEngComm 17 6308–13

[55] [55] Mohammad Yusof N, Ibrahim S and Rozali S 2022 Advances on graphene-based gas sensors for acetone detection based on its physical and chemical attributes J. Mater. Res.37 405–23

[56] [56] Li Q F, Chen W L, Liu W H, Sun M L, Xu M H, Peng H L,Wu H Y, Song S X, Li T H and Tang X H 2022 Highly sensitive graphene ammonia sensor enhanced by concentrated nitric acid treatment Appl. Surf. Sci.586 152689

[57] [57] Kwon B et al 2022 Ultrasensitive N-channel graphene gas sensors by nondestructive molecular doping ACS Nano16 2176–87

[58] [58] Hizam S M M, Al-Dhahebi A M and Mohamed Saheed M S 2022 Recent advances in graphene-based nanocomposites for ammonia detection Polymers 14 5125

[59] [59] Ao D, Li Z J, Fu Y Q, Tang Y L, Yan S N and Zu X T 2019 Heterostructured NiO/ZnO nanorod arrays with significantly enhanced H2S sensing performance Nanomaterials 9 900

[60] [60] Liu B Q, Zhu Q, Pan Y H, Huang F T, Tang L Y, Liu C,Cheng Z, Wang P, Ma J and Ding M N 2022 Single-atom tailoring of two-dimensional atomic crystals enables highly efficient detection and pattern recognition of chemical vapors ACS Sens. 7 1533–43

[61] [61] Liu X H, Ma T T, Pinna N and Zhang J 2017 Two-dimensional nanostructured materials for gas sensing Adv. Funct. Mater. 27 1702168

[62] [62] Cho B et al 2015 Charge-transfer-based gas sensing using atomic-layer MoS2 Sci. Rep. 5 8052

[63] [63] Hashtroudi H, Mackinnon I D R and Shafiei M 2020 Emerging 2D hybrid nanomaterials: towards enhanced sensitive and selective conductometric gas sensors at room temperature J. Mater. Chem. C 8 13108–26

[64] [64] Lei G L, Pan H Y, Mei H S, Liu X H, Lu G C, Lou C M,Li Z S and Zhang J 2022 Emerging single atom catalysts in gas sensors Chem. Soc. Rev. 51 7260–80

[65] [65] Chu T S, Rong C, Zhou L, Mao X Y, Zhang B W and Xuan F Z 2023 Progress and perspectives of single-atom catalysts for gas sensing Adv. Mater. 35 2206783

[66] [66] Wei X Q et al 2021 Synergistically enhanced single-atomic site Fe by Fe3C@C for boosted oxygen reduction in neutral electrolyte Nano Energy 84 105840

[67] [67] Wei X Q, Luo X, Wu N N, Gu W L, Lin Y H and Zhu C Z 2021 Recent advances in synergistically enhanced single-atomic site catalysts for boosted oxygen reduction reaction Nano Energy 84 105817

[68] [68] Yan H, Su C L, He J and Chen W 2018 Single-atom catalysts and their applications in organic chemistry J. Mater.Chem. A 6 8793–814

[69] [69] Li W X, Guo Z H, Yang J, Li Y, Sun X L, He H Y, Li S A and Zhang J J 2022 Advanced strategies for stabilizing single-atom catalysts for energy storage and conversion Electrochem. Energy Rev. 5 9

[70] [70] Zhang T J, Walsh A G, Yu J H and Zhang P 2021 Single-atom alloy catalysts: structural analysis, electronic properties and catalytic activities Chem. Soc. Rev. 50 569–88

[71] [71] Chen Y J, Ji S F, Chen C, Peng Q, Wang D S and Li Y D 2018 Single-atom catalysts: synthetic strategies and electrochemical applications Joule 2 1242–64

[72] [72] Li W H, Yang J R, Wang D S and Li Y D 2022 Striding the threshold of an atom era of organic synthesis by single-atom catalysis Chem 8 119–40

[73] [73] Wei X Q et al 2023 Tuning the spin state of Fe single atoms by Pd nanoclusters enables robust oxygen reduction with dissociative pathway Chem 9 181–97

[74] [74] Zhang X X, Sun J H, Tang K S, Wang H R, Chen T T,Jiang K S, Zhou T Y, Quan H and Guo R H 2022 Ultralow detection limit and ultrafast response/recovery of the H2 gas sensor based on Pd-doped rGO/ZnO-SnO2 from hydrothermal synthesis Microsyst. Nanoeng. 8 67

[75] [75] Zhou M, Jiang Y, Wang G, Wu W J, Chen W X, Yu P,Lin Y Q, Mao J J and Mao L Q 2020 Single-atom Ni-N4 provides a robust cellular NO sensor Nat. Commun.11 3188

[76] [76] Shin H et al 2020 Single-atom Pt stabilized on one-dimensional nanostructure support via carbon nitride/SnO2 heterojunction trapping ACS Nano14 11394–405

[77] [77] Wang L B et al 2016 Atomic-level insights in optimizing reaction paths for hydroformylation reaction over Rh/CoO single-atom catalyst Nat. Commun. 7 14036

[78] [78] Ou L X, Liu M Y, Zhu L Y, Zhang D W and Lu H L 2022 Recent progress on flexible room-temperature gas sensors based on metal oxide semiconductor Nano-Micro Lett.14 206

[79] [79] Gu F B, Cui Y Z, Han D M, Hong S,Flytzani-Stephanopoulos M and Wang Z H 2019 Atomically dispersed Pt (II) on WO3 for highly selective sensing and catalytic oxidation of triethylamine Appl.Catal. B 256 117809

[80] [80] Liu B, Zhang L J, Luo Y Y, Gao L and Duan G T 2021 The dehydrogenation of H-S bond into sulfur species on supported pd single atoms allows highly selective and sensitive hydrogen sulfide detection Small 17 2105643

[81] [81] Chen Y J et al 2020 Engineering the atomic interface with single platinum atoms for enhanced photocatalytic hydrogen production Angew. Chem., Int. Ed.59 1295–301

[82] [82] Li L, Su H Y, Zhou L C, Hu Z X, Li T K, Chen B B, Li H Y and Liu H 2023 Single-atom Ce targeted regulation SnS/SnS2 heterojunction for sensitive and stable room-temperature ppb-level gas sensor Biochem. Eng. J.472 144796

[83] [83] Cheng M, Yang L, Li H Y, Bai W, Xiao C and Xie Y 2021 Constructing charge transfer channel between dopants and oxygen vacancies for enhanced visible-light-driven water oxidation Nano Res. 14 3365–71

[84] [84] Xue Z G et al 2021 Tailoring unsymmetrical-coordinated atomic site in oxide-supported Pt catalysts for enhanced surface activity and stability Small 17 2101008

[85] [85] Zhao Y F et al 2021 Simultaneous oxidative and reductive reactions in one system by atomic design Nat. Catal.4 134–43

[86] [86] Peng Y, Lu B Z and Chen S W 2018 Carbon-supported single atom catalysts for electrochemical energy conversion and storage Adv. Mater. 30 1801995

[87] [87] Wang N, Sun Q M, Zhang T J, Mayoral A, Li L, Zhou X,Xu J, Zhang P and Yu J H 2021 Impregnating subnanometer metallic nanocatalysts into self-pillared zeolite nanosheets J. Am. Chem. Soc. 143 6905–14

[88] [88] Jiao L and Jiang H L 2019 Metal-organic-framework-based single-atom catalysts for energy applications Chem5 786–804

[89] [89] Zhang R F, Deng Z, Shi L, Kumar M, Chang J Q, Wang S M,Fang X D, Tong W and Meng G 2022 Pt-anchored CuCrO2 for low-temperature-operating high-performance H2S chemiresistors ACS Appl. Mater. Interfaces14 24536–45

[90] [90] Xue Z G et al 2020 One-dimensional segregated single Au sites on step-rich ZnO ladder for ultrasensitive NO2sensors Chem 6 3364–73

[91] [91] Liu J Y 2017 Catalysis by supported single metal atoms ACS Catal. 7 34–59

[92] [92] Fonseca J and Lu J L 2021 Single-atom catalysts designed and prepared by the atomic layer deposition technique ACS Catal. 11 7018–59

[93] [93] Zhang P, Xiao Y, Zhang J J, Liu B J, Ma X F and Wang Y 2021 Highly sensitive gas sensing platforms based on field effect transistor—a review Anal. Chim. Acta 1172 338575

[94] [94] Eranna G, Joshi B C, Runthala D P and Gupta R P 2004 Oxide materials for development of integrated gas sensors—a comprehensive review Crit. Rev. Solid State Mater. Sci. 29 111–88

[95] [95] Yuan Z, Bariya M, Fahad H M, Wu J B, Han R, Gupta N and Javey A 2020 Trace-level, multi-gas detection for food quality assessment based on decorated silicon transistor arrays Adv. Mater. 32 1908385

[96] [96] Fahad H M et al 2017 Room temperature multiplexed gas sensing using chemical-sensitive 3.5-nm-thin silicon transistors Sci. Adv. 3 e1602557

[97] [97] Hu P A, Zhang J, Li L, Wang Z L, O’Neill W and Estrela P 2010 Carbon nanostructure-based field-effect transistors for label-free chemical/biological sensors Sensors10 5133–59

[98] [98] Janata J and Josowicz M 2003 Conducting polymers in electronic chemical sensors Nat. Mater. 2 19–24

[99] [99] Barsan N and Weimar U 2001 Conduction model of metal oxide gas sensors J. Electroceram. 7 143–67

[100] [100] Lundstr?m I, Sundgren H, Winquist F, Eriksson M,Krantz-Rülcker C and Lloydspetz A 2007 Twenty-five years of field effect gas sensor research in Link?ping Sens.Actuators B 121 247–62

[101] [101] Eisele I, Doll T and Burgmair M 2001 Low power gas detection with FET sensors Sens. Actuators B 78 19–25

[102] [102] Li Z and Yi J X 2020 Drastically enhanced ammonia sensing of Pt/ZnO ordered porous ultra-thin films Sens. Actuators B 317 128217

[103] [103] Tian R B, Ji P, Luo Z C, Li J M and Sun J H 2021 Room-temperature NH3 gas sensor based on atomically dispersed Co with a simple structure New J. Chem.45 10240–7

[104] [104] Bhati V S, Kumar M and Banerjee R 2021 Gas sensing performance of 2D nanomaterials/metal oxide nanocomposites: a review J. Mater. Chem. C 9 8776–808

[105] [105] Majhi S M, Mirzaei A, Kim H W and Kim S S 2021 Reduced graphene oxide (rGO)-loaded metal-oxide nanofiber gas sensors: an overview Sensors 21 1352

[106] [106] Gai L Y, Lai R P, Dong X H, Wu X, Luan Q T, Wang J,Lin H F, Ding W H, Wu G L and Xie W F 2022 Recent advances in ethanol gas sensors based on metal oxide semiconductor heterojunctions Rare Met. 41 1818–42

[107] [107] Liu L Y, Zhou P, Su X Z, Liu Y H, Sun Y H, Yang H B,Fu H Y, Qu X L, Liu S T and Zheng S R 2022 Synergistic Ni single atoms and oxygen vacancies on SnO2 nanorods toward promoting SO2 gas sensing Sens. Actuators B351 130983

[108] [108] Xiao H M, Hou Y C, Guo Y R and Pan Q J 2023 The coupling of graphene, graphitic carbon nitride and cellulose to fabricate zinc oxide-based sensors and their enhanced activity towards air pollutant nitrogen dioxide Chemosphere 324 138325

[109] [109] Tsymbalenko O, Lee S, Lee Y M, Nam Y S, Kim B C,Kim J Y and Lee K B 2023 High-sensitivity NH3 gas sensor using pristine graphene doped with CuO nanoparticles Microchim. Acta 190 134

[110] [110] Chang S L, Yang M Y, Pang R, Ye L, Wang X C, Cao A Y and Shang Y Y 2022 Intrinsically flexible CNT-TiO2-interlaced film for NO sensing at room temperature Appl. Surf. Sci. 579 152172

[111] [111] Vu T D, Cong T N, Huu B L, Duc C N and Huu L N 2019 Surface-modified carbon nanotubes for enhanced ammonia gas sensitivity at room temperature J. Nanosci.Nanotechnol. 19 7447–51

[112] [112] Du Z F, Li C C, Li L M, Yu H C, Wang Y G and Wang T H 2011 Ammonia gas detection based on polyaniline nanofibers coated on interdigitated array electrodes J.Mater. Sci., Mater. Electron. 22 418–21

[113] [113] Wu Z Q, Chen X D, Zhu S B, Zhou Z W, Yao Y, Quan W and Liu B 2013 Enhanced sensitivity of ammonia sensor using graphene/polyaniline nanocomposite Sens. Actuators B178 485–93

[114] [114] Wojkiewicz J L, Bliznyuk V N, Carquigny S, Elkamchi N,Redon N, Lasri T, Pud A A and Reynaud S 2011 Nanostructured polyaniline-based composites for ppb range ammonia sensing Sens. Actuators B160 1394–403

[115] [115] Pham T, Li G H, Bekyarova E, Itkis M E and Mulchandani A 2019 MoS2-based optoelectronic gas sensor with sub-parts-per-billion limit of NO2 gas detection ACS Nano13 3196–205

[116] [116] Friedman A L, Keith Perkins F, Cobas E, Jernigan G G,Campbell P M, Hanbicki A T and Jonker B T 2014 Chemical vapor sensing of two-dimensional MoS2 field effect transistor devices Solid-State Electron. 101 2–7

[117] [117] Ma S Q 2015 Gas sensitivity of Cr doped BN sheets Appl.Mech. Mater. 799–800 166–70

[118] [118] Heller I, Janssens A M, M?nnik J, Minot E D, Lemay S G and Dekker C 2008 Identifying the mechanism of biosensing with carbon nanotube transistors Nano Lett. 8 591–5

[119] [119] Chen T Y, Chen H I, Hsu C S, Huang C C, Chang C F,Chou P C and Liu W C 2012 On an ammonia gas sensor based on a Pt/AlGaN heterostructure field-effect transistor IEEE Electron Device Lett. 33 612–4

[120] [120] Qin R X, Liu P X, Fu G and Zheng N F 2018 Strategies for stabilizing atomically dispersed metal catalysts Small Methods 2 1700286

[121] [121] He G C, Yan M M, Gong H S, Fei H L and Wang S Y 2022 Ultrafast synthetic strategies under extreme heating conditions toward single-atom catalysts Int. J. Extrem.Manuf. 4 032003

[122] [122] Kaiser S K, Fako E, Manzocchi G, Krumeich F, Hauert R,Clark A H, Safonova O V, López N and Pérez-Ramírez J 2020 Nanostructuring unlocks high performance of platinum single-atom catalysts for stable vinyl chloride production Nat. Catal. 3 376–85

[123] [123] Kwon Y, Kim T Y, Kwon G, Yi J and Lee H 2017 Selective activation of methane on single-atom catalyst of rhodium dispersed on zirconia for direct conversion J. Am. Chem.Soc. 139 17694–9

[124] [124] Hai X et al 2022 Scalable two-step annealing method for preparing ultra-high-density single-atom catalyst libraries Nat. Nanotechnol. 17 174–81

[125] [125] Zhang Z Q et al 2019 The simplest construction of single-site catalysts by the synergism of micropore trapping and nitrogen anchoring Nat. Commun. 10 1657

[126] [126] Yang L, Shi L, Wang D, Lv Y L and Cao D P 2018 Single-atom cobalt electrocatalysts for foldable solid-state Zn-air battery Nano Energy 50 691–8

[127] [127] Sa Y J et al 2016 A general approach to preferential formation of active Fe-Nx sites in Fe-N/C electrocatalysts for efficient oxygen reduction reaction J. Am. Chem. Soc.138 15046–56

[128] [128] Zhao S Y et al 2018 One-pot pyrolysis method to fabricate carbon nanotube supported Ni single-atom catalysts with ultrahigh loading ACS Appl. Energy Mater. 1 5286–97

[129] [129] Cheng Y et al 2019 Iron single atoms on graphene as nonprecious metal catalysts for high-temperature polymer electrolyte membrane fuel cells Adv. Sci. 6 1802066

[130] [130] Jiang C J, Shang Z Y and Liang X H 2015 Chemoselective transfer hydrogenation of nitroarenes catalyzed by highly dispersed, supported nickel nanoparticles ACS Catal.5 4814–8

[131] [131] Cheng N C and Sun X L 2017 Single atom catalyst by atomic layer deposition technique Chin. J. Catal. 38 1508–14

[132] [132] Yan H, Cheng H, Yi H, Lin Y, Yao T, Wang C L, Li J J,Wei S Q and Lu J L 2015 Single-atom Pd1/graphene catalyst achieved by atomic layer deposition: remarkable performance in selective hydrogenation of 1, 3-butadiene J. Am. Chem. Soc. 137 10484–7

[133] [133] Shin H, Ko J, Park C, Kim D H, Ahn J, Jang J S, Kim Y H,Cho S H, Baik H and Kim I D 2022 Sacrificial template-assisted synthesis of inorganic nanosheets with high-loading single-atom catalysts: a general approach Adv. Funct. Mater. 32 2110485

[134] [134] Qiao S M, Wang Q, Zhang Q, Huang C H, He G H and Zhang F X 2022 Sacrificial template method to synthesize atomically dispersed Mn atoms on S, N-codoped carbon as a separator modifier for advanced Li–S batteries ACS Appl. Mater. Interfaces 14 42123–33

[135] [135] Sun Q M, Wang N, Zhang T J, Bai R S, Mayoral A, Zhang P,Zhang Q H, Terasaki O and Yu J H 2019 Zeolite-encaged single-atom rhodium catalysts: highly-efficient hydrogen generation and shape-selective tandem hydrogenation of nitroarenes Angew. Chem., Int. Ed. 58 18570–6

[136] [136] Szilágyi P ′A, Rogers D M, Zaiser I, Callini E, Turner S,Borgschulte A, Züttel A, Geerlings H, Hirscher M and Dam B 2017 Functionalised metal–organic frameworks: a novel approach to stabilising single metal atoms J. Mater.Chem. A 5 15559–66

[137] [137] Liu S S, Tan J M, Gulec A, Crosby L A, Drake T L,Schweitzer N M, Delferro M, Marks L D, Marks T J and Stair P C 2017 Stabilizing single-atom and small-domain platinum via combining organometallic chemisorption and atomic layer deposition Organometallics 36 818–28

[138] [138] Sun G D et al 2018 Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation Nat. Commun. 9 4454

[139] [139] Hu L Z, Wang T, Nie Q Q, Liu J Y, Cui Y P, Zhang K F,Tan Z C and Yu H S 2022 Single Pd atoms anchored graphitic carbon nitride for highly selective and stable photocatalysis of nitric oxide Carbon 200 187–98

[140] [140] Hu D, Wang L, Wang F and Wang J D 2018 Bimetallic Au-Li/SAC catalysts for acetylene hydrochlorination Catal. Commun. 115 45–48

[141] [141] Sarma B B, Jelic J, Neukum D, Doronkin D E, Huang X H,Studt F and Grunwaldt J D 2023 Tracking and understanding dynamics of atoms and clusters of late transition metals with in-situ DRIFT and XAS spectroscopy assisted by DFT J. Phys. Chem. C127 3032–46

[142] [142] Yang J Y et al 2022 Modulating the strong metal-support interaction of single-atom catalysts via vicinal structure decoration Nat. Commun. 13 4244

[143] [143] Zhang Y Q, Yang J, Ge R Y, Zhang J J, Cairney J M, Li Y,Zhu M Y, Li S A and Li W X 2022 The effect of coordination environment on the activity and selectivity of single-atom catalysts Coord. Chem. Rev. 461 214493

[144] [144] Chen J Y et al 2018 Surface engineering protocol to obtain an atomically dispersed Pt/CeO2 catalyst with high activity and stability for CO oxidation ACS Sustain. Chem.Eng. 6 14054–62

[145] [145] Sietsma J R A, van Dillen A J, de Jongh P E and de Jong K P 2006 Application of ordered mesoporous materials as model supports to study catalyst preparation by impregnation and drying Stud. Surf. Sci. Catal.162 95–102

[146] [146] Wang L Q, Huang L, Liang F, Liu S M, Wang Y H and Zhang H J 2017 Preparation, characterization and catalytic performance of single-atom catalysts Chin. J. Catal.38 1528–39

[147] [147] Ding J, Fan M H, Zhong Q and Russell A G 2018 Single-atom silver-manganese nanocatalysts based on atom-economy design for reaction temperature-controlled selective hydrogenation of bioresources-derivable diethyl oxalate to ethyl glycolate and acetaldehyde diethyl acetal Appl. Catal. B 232 348–54

[148] [148] Liu Q and Zhang Z L 2019 Platinum single-atom catalysts: a comparative review towards effective characterization Catal. Sci. Technol. 9 4821–34

[149] [149] Sun L, Cao L R, Su Y, Wang C J, Lin J and Wang X D 2022 Ru1/FeOx single-atom catalyst with dual active sites for water gas shift reaction without methanation Appl. Catal.B 318 121841

[150] [150] Millet M-M et al 2019 Ni single atom catalysts for CO2 activation J. Am. Chem. Soc. 141 2451–61

[151] [151] Zhu Y F, Kong X, Yin J Q, You R, Zhang B, Zheng H Y, Wen X D, Zhu Y L and Li Y W 2017 Covalent-bonding to irreducible SiO2 leads to high-loading and atomically dispersed metal catalysts J. Catal. 353 315–24

[152] [152] Wang Y, Chen L H, Mao Z X, Peng L S, Xiang R, Tang X Y,Deng J H, Wei Z D and Liao Q 2019 Controlled synthesis of single cobalt atom catalysts via a facile one-pot pyrolysis for efficient oxygen reduction and hydrogen evolution reactions Sci. Bull. 64 1095–102

[153] [153] Qi Y F, Li J, Zhang Y Q, Cao Q, Si Y M, Wu Z R, Akram M and Xu X 2021 Novel lignin-based single atom catalysts as peroxymonosulfate activator for pollutants degradation: role of single cobalt and electron transfer pathway Appl.Catal. B 286 119910

[154] [154] Li J X, Chai G D and Wang X W 2023 Atomic layer deposition of thin films: from a chemistry perspective Int.J. Extrem. Manuf. 5 032003

[155] [155] George S M 2010 Atomic layer deposition: an overview Chem. Rev. 110 111–31

[156] [156] Kaden W E, Wu T P, Kunkel W A and Anderson S L 2009 Electronic structure controls reactivity of size-selected Pd clusters adsorbed on TiO2 surfaces Science 326 826–9

[157] [157] Swain S, Altaee A, Saxena M and Samal A K 2022 A comprehensive study on heterogeneous single atom catalysis: current progress, and challenges Coord. Chem.Rev. 470 214710

[158] [158] Liu X, Su Y and Chen R 2023 Atomic-scale engineering of advanced catalytic and energy materials via atomic layer deposition for eco-friendly vehicles Int. J. Extrem. Manuf.5 022005

[159] [159] Pan H Y, Zhou L H, Zheng W, Liu X H, Zhang J and Pinna N 2023 Atomic layer deposition to heterostructures for application in gas sensors Int. J. Extrem. Manuf.5 022008

[160] [160] Oviroh P O, Akbarzadeh R, Pan D Q, Coetzee R A M andJen T C 2019 New development of atomic layer deposition: processes, methods and applications Sci. Technol. Adv. Mater. 20 465–96

[161] [161] Cheng N C, Shao Y Y, Liu J and Sun X L 2016 Electrocatalysts by atomic layer deposition for fuel cell applications Nano Energy 29 220–42

[162] [162] Cheng N C et al 2016 Platinum single-atom and cluster catalysis of the hydrogen evolution reaction Nat. Commun.7 13638

[163] [163] Sun S H et al 2013 Single-atom catalysis using Pt/graphene achieved through atomic layer deposition Sci. Rep. 3 1775

[164] [164] Song Z X et al 2020 Engineering the low coordinated Pt single atom to achieve the superior electrocatalytic performance toward oxygen reduction Small 16 2003096

[165] [165] Shi X X et al 2020 Copper catalysts in semihydrogenation of acetylene: from single atoms to nanoparticles ACS Catal.10 3495–504

[166] [166] Yin P Q et al 2016 Single cobalt atoms with precise N-coordination as superior oxygen reduction reaction catalysts Angew. Chem., Int. Ed. 55 10800–5

[167] [167] Chen Y J et al 2017 Isolated single iron atoms anchored on N-doped porous carbon as an efficient electrocatalyst for the oxygen reduction reaction Angew. Chem., Int. Ed.56 6937–41

[168] [168] Guo S L, Zhao Y K, Wang C X, Jiang H Q and Cheng G J2020 A single-atomic noble metal enclosed defective MOF via cryogenic UV photoreduction for CO oxidation with ultrahigh efficiency and stability ACS Appl. Mater.Interfaces 12 26068–75

[169] [169] Jiao L, Wan G, Zhang R, Zhou H, Yu S H and Jiang H L 2018 From metal-organic frameworks to single-atom fe implanted N-doped porous carbons: efficient oxygen reduction in both alkaline and acidic media Angew. Chem.,Int. Ed. 57 8525–9

[170] [170] Liu Q et al 2022 Presentation of gas-phase-reactant-accessible single-rhodium-atom catalysts for CO oxidation, via MOF confinement of an Anderson polyoxometalate J. Mater. Chem. A10 18226–34

[171] [171] Wu N N et al 2022 Atomically dispersed Ru3 site catalysts for electrochemical sensing of small molecules Biosens. Bioelectron. 216 114609

[172] [172] Yang S T, Liu X L, Niu F Q, Wang L Y, Su K K, Liu W F,Dong H Y, Yue H Y and Yin Y H 2022 2D single-atom Fe–N–C catalyst derived from a layered complex as an oxygen reduction catalyst for PEMFCs ACS Appl. Energy Mater. 5 8791–9

[173] [173] Yuan C Z, Zhan L Y, Liu S J, Chen F, Lin H J, Wu X L and Chen J R 2020 Semi-sacrificial template synthesis of single-atom Ni sites supported on hollow carbon nanospheres for efficient and stable electrochemical CO2 reduction Inorg. Chem. Front. 7 1719–25

[174] [174] Hou Y, Liang Y L, Shi P C, Huang Y B and Cao R 2020 Atomically dispersed Ni species on N-doped carbon nanotubes for electroreduction of CO2 with nearly 100%CO selectivity Appl. Catal. B 271 118929

[175] [175] Zhang L K et al 2020 Atomically dispersed Co catalyst for efficient hydrodeoxygenation of lignin-derived species and hydrogenation of nitroaromatics ACS Catal. 10 8672–82

[176] [176] Qiu L M, Shen S W, Ma C, Lv C M, Guo X, Jiang H L, Liu Z,Qiao W M, Ling L C and Wang J T 2022 Controllable fabrication of atomic dispersed low-coordination nickel-nitrogen sites for highly efficient electrocatalytic CO2 reduction Biochem. Eng. J. 440 135956

[177] [177] Li X et al 2022 Functional CeOx nanoglues for robust atomically dispersed catalysts Nature 611 284–8

[178] [178] Han G-F et al 2022 Abrading bulk metal into single atoms Nat. Nanotechnol. 17 403–7

[179] [179] Lang R et al 2019 Non defect-stabilized thermally stable single-atom catalyst Nat. Commun. 10 234

[180] [180] Nakate U T, Bulakhe R N, Lokhande C D and Kale S N 2016 Au sensitized ZnO nanorods for enhanced liquefied petroleum gas sensing properties Appl. Surf. Sci.371 224–30

[181] [181] Rong Q, Xiao B, Zeng J Y, Yu R H, Zi B Y, Zhang G L,Zhu Z Q, Zhang J, Wu J S and Liu Q J 2022 Pt single atom-induced activation energy and adsorption enhancement for an ultrasensitive ppb-level methanol gas sensor ACS Sens. 7 199–206

[182] [182] Zong B Y, Xu Q K and Mao S 2022 Single-atom Pt-functionalized Ti3C2Tx field-effect transistor for volatile organic compound gas detection ACS Sens.7 1874–82

[183] [183] Cong W H, Song P, Zhang Y, Yang S, Liu W F, Zhang T Y,Zhou J D, Wang M L and Liu X G 2022 Supramolecular confinement pyrolysis to carbon-supported Mo nanostructures spanning four scales for hydroquinone determination J. Hazard. Mater. 437 129327

[184] [184] Xu Y S, Zheng W, Liu X H, Zhang L Q, Zheng L L, Yang C, Pinna N and Zhang J 2020 Platinum single atoms on tin oxide ultrathin films for extremely sensitive gas detection Mater. Horiz. 7 1519–27

[185] [185] Ma J H, Ren Y, Zhou X R, Liu L L, Zhu Y H, Cheng X W,Xu P C, Li X X, Deng Y H and Zhao D Y 2018 Pt nanoparticles sensitized ordered mesoporous WO3 semiconductor: gas sensing performance and mechanism study Adv. Funct. Mater. 28 1705268

[186] [186] Niu W J, He J Z, Gu B N, Liu M C and Chueh Y L 2021 Opportunities and challenges in precise synthesis of transition metal single-atom supported by 2D materials as catalysts toward oxygen reduction reaction Adv. Funct.Mater. 31 2103558

[187] [187] Akri M et al 2019 Atomically dispersed nickel as coke-resistant active sites for methane dry reforming Nat.Commun. 10 5181

[188] [188] Zhang J, Hu P A, Zhang R F, Wang X N, Yang B, Cao W W,Li Y B, He X D, Wang Z L and O’Neill W 2012 Soft-lithographic processed soluble micropatterns of reduced graphene oxide for wafer-scale thin film transistors and gas sensors J. Mater. Chem. 22 714–8

[189] [189] Trabelsi A B, Alkallas F H, Manthrammel M A, Shkir M and AlFaify S 2022 Improvement in ammonia gas sensing properties of Co doped MoO3 thin films prepared by cost effective nebulizer spray pyrolysis method Results Phys.43 106036

[190] [190] Sharma B and Myung J 2019 Pd-based ternary alloys used for gas sensing applications: a review Int. J. Hydrog. Energy 44 30499–510

[191] [191] Li Z J, Yan S N, Wu Z L, Li H, Wang J Q, Shen W Z, Wang Z G and Fu Y Q 2018 Hydrogen gas sensor based on mesoporous In2O3 with fast response/recovery and ppb level detection limit Int. J. Hydrog. Energy 43 22746–55

[192] [192] Xue Z G, Wang C, Tong Y J, Yan M Y, Zhang J W, Han X,Hong X, Li Y F and Wu Y E 2022 Strain-assisted single Pt sites on high-curvature MoS2 surface for ultrasensitive H2S sensing CCS Chem. 4 3842–51

[193] [193] Guarnieri M and Balmes J R 2014 Outdoor air pollution and asthma Lancet 383 1581–92

[194] [194] Geng X et al 2021 Atomically dispersed Pb ionic sites in PbCdSe quantum dot gels enhance room-temperature NO2 sensing Nat. Commun. 12 4895

[195] [195] Wang C Y, Xie J Y, Chang X, Zheng W, Zhang J and Liu X H 2023 ZnO single nanowire gas sensor: a platform to investigate the sensitization of Pt Biochem. Eng. J.473 145481

[196] [196] Chen W M, Li P P, Yu J, Cui P X, Yu X H, Song W G and Cao C Y 2022 In-situ doping nickel single atoms in two-dimensional MXenes analogue support for room temperature NO2 sensing Nano Res. 15 9544–53

[197] [197] Wang H, Luo Y Y, Li K, Liu B, Gao L and Duan G T 2022Porous α-Fe2O3 gas sensor with instantaneous attenuated response toward triethylamine and its reaction kinetics Biochem. Eng. J. 427 131631

[198] [198] Li D K, Li Y W, Wang X H, Sun G, Cao J L and Wang Y 2022 Improved TEA sensitivity and selectivity of In2O3 porous nanospheres by modification with Ag nanoparticles Nanomaterials 12 1532

[199] [199] Peng R Q, Li Y Y, Liu T, Si P C, Feng J K, Suhr J and Ci L 2020 Boron-doped graphene coated Au@SnO2 for high-performance triethylamine gas detection Mater.Chem. Phys. 239 121961

[200] [200] Ju D X, Xu H Y, Xu Q, Gong H B, Qiu Z W, Guo J, Zhang J and Cao B Q 2015 High triethylamine-sensing properties of NiO/SnO2 hollow sphere P-N heterojunction sensors Sens. Actuators B 215 39–44

[201] [201] Zeng Z J et al 2021 Single-atom silver loaded on tungsten oxide with oxygen vacancies for high performance triethylamine gas sensors J. Mater. Chem. A9 8704–10

[202] [202] Sun L, Wang B and Wang Y 2020 High-temperature gas sensor based on novel Pt single atoms@SnO2 nanorods@SiC nanosheets multi-heterojunctions ACS Appl. Mater. Interfaces 12 21808–17

[203] [203] Li Q H et al 2021 Porous γ-Fe2O3 nanoparticle decorated with atomically dispersed platinum: study on atomic site structural change and gas sensor activity evolution Nano Res. 14 1435–42

[204] [204] Yang Z, Cao W, Peng C, Wang T, Li B, Ma H, Su Y, Zhou Z,Yang J and Zeng M 2021 Construction, application and verification of a novel formaldehyde gas sensor system based on Ni-doped SnO2 nanoparticles IEEE Sens. J.21 11023–30

[205] [205] Lou C M, Lei G L, Liu X H, Xie J Y, Li Z S, Zheng W,Goel N, Kumar M and Zhang J 2022 Design and optimization strategies of metal oxide semiconductor nanostructures for advanced formaldehyde sensors Coord.Chem. Rev. 452 214280

[206] [206] Gu F G, Di M Y, Han D M, Hong S and Wang Z H 2020 Atomically dispersed Au on In2O3 nanosheets for highly sensitive and selective detection of formaldehyde ACS Sens. 5 2611–9

[207] [207] Zhou L H, Chang X, Zheng W, Liu X H and Zhang J 2023 Single atom Rh-sensitized SnO2 via atomic layer deposition for efficient formaldehyde detection Biochem.Eng. J. 475 146300

[208] [208] Qiu J W, Hu X F, Shi L, Fan J L, Min X J, Zhang W and Wang J L 2021 Enabling selective, room-temperature gas detection using atomically dispersed Zn Sens. Actuators B329 129221

[209] [209] McCoy D E, Feo T, Harvey T A and Prum R O 2018 Structural absorption by barbule microstructures of super black bird of paradise feathers Nat. Commun. 9 1

[210] [210] Duchesne P N et al 2018 Golden single-atomic-site platinum electrocatalysts Nat. Mater. 17 1033–9

[211] [211] Yao Y C et al 2019 Engineering the electronic structure of single atom Ru sites via compressive strain boosts acidic water oxidation electrocatalysis Nat. Catal. 2 304–13

[212] [212] Duan K, Li W, Zhu C, Li J Z, Xu J and Wang X F 2022 Promoting sensitivity and selectivity of NO2 gas sensor based on (P, N)-doped single-layer WSe2: a first principles study Results Phys. 34 105296

[213] [213] Xu Z W, Shi Z Z, Wang M Y, Song R F, Zhang X Z, Liu G W and Qiao G J 2021 Gas sensing properties of defective tellurene on the nitrogen oxides: a first-principles study Sens Actuators A 328 112766

[214] [214] Mu L, Chen D C and Cui H 2022 Single Pd atom embedded Janus HfSeTe as promising sensor for dissolved gas detection in transformer oil: a density functional theory study Surf. Interfaces 35 102398

[215] [215] Catto A C, da Silva L F, Bernardi M I B, Bernardini S,Aguir K, Longo E and Mastelaro V R 2016 Local structure and surface properties of CoxZn1-xO thin films for ozone gas sensing ACS Appl. Mater. Interfaces 8 26066–72

[216] [216] Koga K 2020 Electronic and catalytic effects of single-atom Pd additives on the hydrogen sensing properties of Co3O4 nanoparticle films ACS Appl. Mater. Interfaces 12 20806–23

[217] [217] Ye X L, Lin S J, Zhang J W, Jiang H J, Cao L A, Wen Y Y,Yao M S, Li W H, Wang G E and Xu G 2021 Boosting room temperature sensing performances by atomically dispersed pd stabilized via surface coordination ACS Sens.6 1103–10

[218] [218] Li D K, Li Y W, Wang X H, Sun G, Cao J L and Wang Y 2023 Surface modification of In2O3 porous nanospheres with Au single atoms for ultrafast and highly sensitive detection of CO Appl. Surf. Sci. 613 155987

[219] [219] Zhou W, Tan Y, Ma J, Wang X, Yang L, Li Z, Liu C C, Wu H,Sun L and Deng W Q 2022 Ultrasensitive NO sensor based on a nickel single-atom electrocatalyst for preliminary screening of COVID-19 ACS Sens. 7 3422–9

[220] [220] Niu F, Shao Z W, Gao H, Tao L M and Ding Y 2021 Si-doped graphene nanosheets for NOx gas sensing Sens.Actuators B 328 129005

[221] [221] Zhang J, Zhao C, Hu P A, Fu Y Q, Wang Z L, Cao W W,Yang B and Placido F 2013 A UV light enhanced TiO2/graphene device for oxygen sensing at room temperature RSC Adv. 3 22185–90