The Enzyme-Like Property and Photocatalytic Effect on α, α-Diphenyl-β-Picrylhydrazyl (DPPH) of CuPt Nanocomposite

With co-reduction method, a new nanocomposite consisting of Cu and Pt (CuPt) was prepared in household. The morphology of CuPt alloy was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). The diameter of CuPt was ca. 125 nm measured by dynamic light scattering (DLS). The atom ratio of Cu to Pt was determined to be about 1.2 by energy-dispersive X-ray (EDX). Enzyme-like activities of CuPt, including peroxidase (POD)-like and ascorbic acid oxidase (AAO)-like activities were examined with UV-Vis-NIR spectrometer. The CuPt was found to interact with α, α-diphenyl-β-picrylhydrazyl (DPPH) in the presence or absence of AA. With irradiation by light emitting diode (LED) light, the photocatalysis effect of CuPt on DPPH was investigated. With the addition of histidine, it was proved that singlet oxygen had an important role in the interaction involving CuPt. The new nanocomposite and the properties suggest various potentials of application.Keywords:CuPt;peroxidase (POD)-like;ascorbic acid oxidase (AAO)-like;DPPH