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Graphene oxide (GO)- and reduced graphene oxide (RGO)-based pH sensors. (A) Reversible vis-NIR fluorescence change of acidic vs. salt states. (B) Reversible vis-NIR fluorescence change of pH. Figures (A,B) were reproduced from Chen and Yan (2011) with permission from the Royal Society of Chemistry. (C) Schematic diagram of an RGO field effect transistor. (D) Typical sensing curves along pH alter RGO. Figures (C,D) were reproduced from Sohn et al. (2013) with permission from Elsevier.
