Zhaochun Zhang

Surface-enhanced Raman scattering, electron paramagnetic resonance, and electrochemical activity of copper(II) l-methionine complex/silver nanoparticles/graphene-coupled nanoaggregates

Copper(II) l-methionine complex/silver nanoparticles/graphene-coupled nanoaggregates (Cu(Met)2/Ag/Graphene) were prepared and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and Raman scattering spectroscopy. Analysis of surface-enhanced Raman scattering of as-prepared nanoaggregate revealed that Cu(Met)2 molecular plane exhibited a perpendicular orientation with respect to the surface of silver nanoparticles. The electrochemical performance of Cu(Met)2/Ag/Graphene investigated by cyclic voltammetry displayed that the redox currents of Cu(Met)2 were enhanced in the presence of Ag/Graphene. The electron paramagnetic resonance spectrum performed at room temperature showed that compared with Cu(Met)2 powder the g value of Cu(Met)2/Ag/Graphene reduced slightly, indicating minor discrepancies of the local magnetic field around the copper ions between Cu(Met)2 powder and Cu(Met)2/Ag/Graphene coupled nanoaggregates. Graphical Abstract