Fig. 2

A TEM image of MoS₂. Scale bar is 20 nm. B TEM image of Au@MoS₂ nanosheets and size-distribution histogram of Au NPs (inset). Scale bar is 50 nm. C Typical UV-vis absorption spectra of MoS₂ and Au@MoS₂ nanosheets. D CVs of Au@MoS₂ modified GCE in reaction buffer with 5 mM Fe(CN)₆^3−/4− and 0.1 M KCl at different scan rates from 20 to 300 mV/s. E The linear relations of Au@MoS₂ modified GCE with the anodic and cathodic peak current against the square root of scan rate