Rapid synthesis of Co, Ni co-doped ZnO nanoparticles: Optical and electrochemical properties

Made available in DSpace on 2018-11-27T00:47:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-10-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) Brazilian Nanotechnology National Laboratory, LNNano, Campinas, SP, Brazil We report for the first time a rapid preparation of Zn1-2xCoxNixO nanoparticles via a versatile and environmentally friendly route, microwave-assisted hydrothermal (MAH) method. The Co, Ni co-doped ZnO nanoparticles present an effect on photoluminescence and electrochemical properties, exhibiting excellent electrocatalytic performance compared to undoped ZnO sample. Photoluminescence spectroscopy measurements indicated the reduction of the green-orange-red visible emission region after adding Co and Ni ions, revealing the formation of alternative pathways for the generated recombination. The presence of these metallic ions into ZnO creates different defects, contributing to a local structural disorder, as revealed by Raman spectra. Electrochemical experiments revealed that the electrocatalytic oxidation of dopamine on ZnO attached to multi-walled carbon nanotubes improved significantly in the Co, Ni co-doped ZnO samples when compared to pure ZnO. (C) 2015 Elsevier Inc. All rights reserved. Univ Fed Uberlandia, Inst Quim, BR-38400902 Uberlandia, MG, Brazil Univ Estadual Paulista, LIEC, Inst Quim, BR-14800900 Araraquara, SP, Brazil Univ Estadual Paulista, LIEC, Inst Quim, BR-14800900 Araraquara, SP, Brazil FAPEMIG: APQ-00988-13 FAPEMIG: CEX - RED-00010-14 Brazilian Nanotechnology National Laboratory, LNNano, Campinas, SP, Brazil: XPS-18304