Fig. 1. Proposed mechanisms for RGO, RGO–AP5 and RGO–AP5–AuNPs to sense target molecules, including dopamine, 4-acetamidophenol, uric acid, methylene blue, tryptophan and imidacloprid, as monitored by cyclic voltammetry. Reproduced from ref. 19 with permission from the American Chemical Society, Copyright 2013.