Figure 4.

GO and rGO Photodetectors. (a) fully suspended rGO photodetector grown on Si nanowire array and (b) photoresponse of this photodetector under UV and THz illumination. Reprinted with permission from Yang et al. [73], Carbon 115, 561–570, Copyright 2017 Elsevier (New York, NY, USA); (c) fabrication steps of 3D nanoporous rGO (3D np-rGO); (d) power-dependent responsivity for two sample 3D np-rGO devices at $\lambda =370\mathrm{nm}$. Reprinted with permission from Ito et al. [74], Adv. Func. Mater. 26, 1271. Copyright 2016 John Wiley and Sons (Hoboken, NJ, USA); (e) schematic of TiO${}_2$ nanoparticles embedded in GO matrix; (f) cathodic photoresponse of GO/TiO${}_2$ photodetectors under visible illumination, on and off indicate the switching of the light source. Reproduced with permission from Chen C. et al. [79], ACS Nano 2010 4, 6425. Copyright 2010 American Chemical Society (Washington, DC, USA).