Facile Synthesis of Copper-Coated-Reduced-Graphene-Oxide and Its Application as a Highly Sensitive Electrochemical Sensor for Hydroquinone

Figure 3

XPS spectra of GO and Cu/rGO: (a) survey; (b) C1s; (c) Cu 2p; (d) O1s.

(a)

(b)

(c)

(d)