Fig. 1. Schematic diagram of graphene oxide and laser reduction of graphene oxide. The big, middle, and small spheres represent oxygen, carbon, and hydrogen atoms, respectively^[69]

Fig. 2. Oxygen content and conductivity of graphene oxide are controlled by laser. (a) C1s XPS spectra of GO and LRGO prepared by TBLI at different laser power; (b) relationship between C-C, C-O,C=O and O atom percentage and laser power; (c) I-V curve of LRGO prepared by TBLI at 0.15, 0.2, 0.3 W laser power^[79]

Fig. 3. Laser micropatterning reduction of graphene oxide. (a) Arcuate microcircuit; (b)comb electrode; (c)involute microcircuit; (d) school emblem of Jilin University; (e) word of “graphene”; (f) letter “G”; (g) molecular structure of benzene ring; (h) hexagonal grid, scale is 10 μm; (i) photo of LRGO electrode array^[83]

Fig. 4. Laser enabled micro/nanostructure of graphene. (a) Schematic diagram of graphene film with micro/nanostructure prepared by TBLI; (b) optical microscope pictures of graphene film with one-dimensional grating structure and (c) two-dimensional grating structure; (d)(e) diffraction spots of 405 nm laser on the LRGO film with one-dimensional and two-dimensional grating structure; (f) structural color of graphene film with micro/nano structure^[76]

Fig. 5. N-doped LRGO. (a) C1s XPS spectra of GO and NLRGO prepared at different laser power; (b)(c) N1s spectra of GO and NLRGO prepared at different laser powers; (c) schematic diagram of N-doped graphene and corresponding formation energy calculated from the first principle; (d) relationship between the percentages of pyridine-N/ pyrrole-N and graphite-N and laser power^[83]

Fig. 6. Flexible gas sensor fabricated by laser. (a) Fabrication diagram of flexible NO₂ sensor based on In₂O₃@LRGO film; (b) photo of 2×4 NO₂ sensor array processed by laser; (c)(d) sensing performance of NO₂ sensor array^[90]

Fig. 7. Graphene-based pressure sensor fabricated by laser. (a) Schematic diagram of graphene-based pressure sensor; (b) sensing mechanism of graphene-based pressure sensor; (c) relationship between conductivity and pressure of graphene-based pressure sensor [sensitivity is 0.96 kPa^-1 at low pressure (0-50 kPa), and 0.005 kPa^-1 at high pressure (50-113 kPa)]; (d) stability test of graphene-based pressure sensor^[93]

Fig. 8. Comparison of mechanical and electrical properties of TGASSs and SSGs. (a) Change of relative resistance of TGASSs with tensile strain; (b) change of relative resistance of SSGs with tensile strain (inset picture showing the difference between TGASSs and SSGs, with the scale of 1cm in both pictures); (c) change of relative resistance of TGASSs and SSGs under different cyclic strains at 0.5 Hz; (d) at 0.1, 0.25, 0.5, and 1.25 Hz, the change of relative resistance of TGASSs under cyclic tension re

Fig. 9. Graphene-based supercapacitor fabricated by laser. (a) Structure schematic diagram of supercapacitor; (b) principle diagram of all solid state LSG-EC shows that the gel electrolyte can be used as electrolyte and can be used as a separator (inset photographs of the flexibility of supercapacitor); (c) comparison of properties of gel electrolyte and aqueous electrolyte LSG-EC; (d) relationship between the bending angle of the device and its performance^[75

Fig. 10. Graphene-based GHEG fabricated by laser. (a) Schematic diagram of GHEG preparation; (b) V_oc and I_sc of GHEG under periodic relative humidity change (ΔR_RH=80%)^[102]