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

We report for the first time a rapid preparation of Zn{sub 1−2x}Co{sub x}Ni{sub x}O 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. - Graphical abstract: Rapid synthesis of Co, Ni co-doped ZnO nanoparticles: optical and electrochemical properties. Co, Ni co-doped ZnO hexagonal nanoparticles with optical and electrocatalytic properties were successfully prepared for the first time using a microwave hydrothermal method at mild conditions. - Highlights: • Co{sup 2+} and Ni{sup 2+} into ZnO lattice obtained a mild and environmentally friendly process. • The heating method strongly influences in the growth and shape ofmore » the particles. • Short-range defects generated by the ions insertion affects the photoluminescence. • Doped ZnO nanoparticles improve the electrocatalytic properties of pure oxide.« less
Authors:
; ;  [1] ;  [2] ;  [1] ; ;  [2] ;  [1] ;  [1]
  1. Instituto de Química, Universidade Federal de Uberlândia, 38400-902 Uberlândia, MG (Brazil)
  2. LIEC, Instituto de Química, Universidade Estadual Paulista, 14800-900 Araraquara, SP (Brazil)
Publication Date:
OSTI Identifier:
22486822
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 230; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CARBON NANOTUBES; COBALT IONS; COMPARATIVE EVALUATIONS; DOPAMINE; DOPED MATERIALS; ELECTROCHEMISTRY; EMISSION SPECTROSCOPY; HYDROTHERMAL SYNTHESIS; MICROWAVE RADIATION; NANOPARTICLES; NICKEL IONS; OXIDATION; PHOTOLUMINESCENCE; RAMAN SPECTRA; RECOMBINATION; REDUCTION; SENSORS; ZINC OXIDES