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

Journal Article · Thu Oct 15 04:00:00 EDT 2015 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2015.07.026· OSTI ID:22486822

Romeiro, Fernanda C.; Marinho, Juliane Z.; Lemos, Samantha C.S. ^[1]; Moura, Ana P. de ^[2]; Freire, Poliana G. ^[1]; Silva, Luis F. da; Longo, Elson ^[2]; Munoz, Rodrigo A.A. ^[1]

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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)

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 of the particles. • Short-range defects generated by the ions insertion affects the photoluminescence. • Doped ZnO nanoparticles improve the electrocatalytic properties of pure oxide.

• OSTI ID: 22486822
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 230; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

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