Fig. 9From: Ag+ colorimetric sensor based on graphene oxide/nano-platinum compositeOptimization of composite material concentration during color development. Reaction condition: GO/PtNPs (0.047, 0.094, 0.141, 0.187, 0.234, 0.281 μg/mL), H2O2 0.02 M, TMB 0.02 Mm, pH = 5, t = 5 min, λ = 652 nmBack to article page