[1] S Inagaki, N Morii, M Numata. Development of a reliable method to determine water content by headspace gas chromatography/mass spectrometry with the standard addition technique. Analytical Methods, 7, 4816-4820(2015).

[2] S Veillet, V Tomao, F Visinoni, et al. New and rapid analytical procedure for water content determination: microwave accelerated Dean-Stark. Analytica Chimica Acta, 632, 203-207(2009).

[3] Y Ooyama, S Aoyama, K Furue, et al. Fluorescence sensor for water based on PET (photo-induced electron transfer): Anthracene-bis (aminomethyl) phenylboronic acid ester. Dyes and Pigments, 123, 248-253(2015).

[4] E Tavčar, E Turk, S Kreft. Simple modification of Karl-Fischer titration method for determination of water content in colored samples. Journal of Analytical Methods in Chemistry, 2012, 379724(2012).

[5] P Kumar, A Ghosh, D A Jose. Chemical sensors for water detection in organic solvents and their applications. Chemistry Select, 6, 820-842(2021).

[6] H R Westrich. Determination of water in volcanic glasses by Karl-Fischer titration. Chemical Geology, 63, 335-340(1987).

[7] P Bruttel, R Schlink. Water determination by Karl Fischer titration. Metrohm Monograph, 8, 2003-2009(2003).

[8] J C Verhoef, E Barendrecht. Mechanism and reaction rate of the Karl Fischer titration reaction: Part V. Analytical Implications. Analytica Chimica Acta, 94, 395-403(1977).

[9] J Wang, Z Li, J Wang. All-optical fiber miniature soil moisture content sensor. Infrared and Laser Engineering, 51, 20210299(2022).

[10] L Guan, Y Lu, Z He, et al. Design and development of an intelligent security alarm system based on optical fiber sensing. Infrared and Laser Engineering, 51, 20220028(2022).

[11] G Qin, F Meng, H Li, et al. Adaptive demodulation of reflection spectrum intensity of fiber grating link. Infrared and Laser Engineering, 51, 20200440(2022).

[12] G Sun, P Wang, Y Jiang, et al. Research progress on flexible fiber-based tactile sensors. Journal of Hebei University of Technology, 51, 1-19(2022).

[13] Z Zhou, Z Shi, X Cai, et al. The use of functionalized silk fibroin films as a platform for optical diffraction-based sensing applications. Advanced Materials, 29, 1605471(2017).

[14] [14] Padaki N V, Das B, Basu A. 1Advances in understing the properties of silk[M]Advances in Silk Science Technology. Cambridge: Woodhead Publishing, 2015: 316.

[15] S Fan, Y Zhang, X Huang, et al. Silk materials for medical, electronic and optical applications. Science China (Technological Sciences), 62, 903-918(2019).

[16] Y Chen, L Duan, Y Ma, et al. Preparation of transient electronic devices with silk fibroin film as a flexible substrate. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 600, 124896(2020).

[17] H Kwon, S Kim. Chemically tunable, biocompatible, and cost-effective metal-insulator-metal resonators using silk protein and ultrathin silver films. ACS Photonics, 2, 1675-1680(2015).

[18] Y Wang, M Li, Y Wang. Silk: a versatile biomaterial for advanced optics and photonics [Invited]. Chinese Optics Letters, 18, 080004(2020).

[19] S Arif, M Umar, S Kim. Interacting metal-insulator-metal resonator by nanoporous silver and silk protein nanomembranes and its water-sensing application. ACS Omega, 4, 9010-9016(2019).

[20] Y Zhang, Y Hong, Y Sheng, et al. Current status and development trends of mid-infrared hollow core fiber technology (Invited). Infrared and Laser Engineering, 52, 20230132(2023).

[21] W Wang, X Sheng, K Hu, et al. Novel hybrid-structured polarization-maintaining hollow core fiber. Electro-Optic Technology Application, 37, 41-47(2022).

[22] N Li, B Li, C Xing, et al. Research progress on regulation of ion channel function by near-infrared light-responsive materials. Journal of Hebei University of Technology, 51, 43-54(2022).

[23] S Liu, Y Zhang, L W Zhao, et al. Research on multi core hollow core photonic band gap fiber for 2 μm band laser transmission. Electro-Optic Technology Application, 38, 21-27(2023).

[24] Y Zhang, S Liu, Z Bai. Research on characteristics of 2 μm band 7-cell hollow core photonic bandgap fiber. Electro-Optic Technology Application, 36, 34-38(2021).

[25] C Qin. Sol-gel method in fiber preparation. Optical Fiber & Electric Cable and Their Applications, 1, 21-26(1989).

[26] Z Yin, L Zou, B Tang, et al. Preparation of large-pore SiO₂ crystal on fiber substrate by sol-gel method. Journal of Jiangsu University of Science and Technology, 21, 43-49(2015).

[27] J Mrázek, V Matejec, I Kasik, et al. Application of the solgel method at the fabrication of microstructure fibers. Journal of Solgel Science and Technology, 31, 175-178(2004).

[28] K Wang, Y Jin, Y Liu, et al. Preparation and characterization of multi-morphology and multi-period micro-nano composite structures. Advances in Laser and Optoelectronics, 56, 51-58(2019).

[29] [29] Dai Y. Fabrication optical properties of largearea micronano structures[D]. Hefei: University of Science Technology of China, 2019. (in Chinese)

[30] X Liu, W Zhang, Z Lin, et al. Coupling of silk fibroin nanofibrils enzymatic membrane with ultra-thin PtNPs/graphene film to acquire long and stanble on-skin sweat glucose and lactate sensing. Small Methods, 5, 2000926(2021).

[31] J Liu, Q Chen, Q Liu, et al. Intelligent silk fibroin ionotronic skin for temperature sensing. Advanced Materials Technologies, 5, 200430(2020).

[32] N Cennamo, L Zeni, P Tortora, et al. A molecularly imprinted polymer on a plasmonic plastic optical fiber to detect perfluorinated compounds in water. Sensors, 18, 1836(2018).

[33] N Cennamo, L Zeni, P Tortora, et al. A high sensitivity biosensor to detect the presence of perfluorinated compounds in environment. Talanta, 178, 955-961(2018).

[34] F Faiz, G Baxter, S Collins, et al. Polyvinylidene fluoride coated optical fibre for detecting perfluorinated chemicals. Sensors and Actuators B: Chemical, 312, 128006(2020).