Fig. 15
From: Ag+ colorimetric sensor based on graphene oxide/nano-platinum composite
A Photographs of color change of solution of detection system at different concentrations of Ag+; B Colorimetric sensing method based on GO/PtNPs absorbance versus time curve of different concentrations of Ag+; C The relationship between the absorbance and the concentration of Ag+; and D Linear fitting curve between absorbance value and—log [Ag+]. Reaction condition: GO/PtNPs 0.047 μg/mL, H2O2 0.02 M, TMB 0.02 Mm, pH = 5, t = 5 min, λ = 652 nm