Photoluminescence and Magnetism in Mn2+-Doped ZnO Nanostructures Grown Rapidly by the Microwave Hydrothermal Method

Photoluminescence and Magnetism in Mn2+-Doped ZnO Nanostructures Grown Rapidly by the Microwave Hydrothermal Method

Author Romeiro, Fernanda C. Google Scholar
Marinho, Juliane Z. Google Scholar
Silva, Anielle Christine A. Google Scholar
Cano, Nilo Francisco Autor UNIFESP Google Scholar
Dantas, Noelio O. Google Scholar
Lima, Renata C. Google Scholar
Institution Universidade Federal de Uberlândia (UFU)
Universidade Federal de São Paulo (UNIFESP)
Abstract Zn1-xMnxO nanostructures were synthesized via the microwave-assisted hydrothermal method, which rapidly produces particles of controlled size and morphology. Samples were analyzed considering the effects of manganese ion concentration. XRD revealed that all samples had wurtzite-type structure with Mn2+ ions incorporated in the oxide lattice. UV-vis spectra showed absorption bands from the d-d transitions of Mn2+ ions. As the doping concentration increased, the value of the energy gap decreased, indicating intermediary energy levels within the band gap in the Mn-doped ZnO samples. All samples produced broadband photoluminescence (PL) emissions in the yellow-orange-red range. Additionally, the PL intensity decreased with Mn2+ ion incorporation into the ZnO lattice due to the creation of new recombination centers. Microscopy images showed that manganese in the ZnO matrix produced homogeneously distributed nanostructures. EPR results indicated two locations of Mn2+ ions in the ZnO lattice, lower concentrations in the core of the lattice and higher concentrations at the surface.
Language English
Sponsor 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)
Rede Nanobiotec/Brasil
Rede Mineira de Quimica (RQ:MG)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number CNPq: 477150/2008-0
FAPEMIG: APQ-01842-09
Date 2013-12-12
Published in Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 117, n. 49, p. 26222-26227, 2013.
ISSN 1932-7447 (Sherpa/Romeo, impact factor)
Publisher Amer Chemical Soc
Extent 26222-26227
Origin http://dx.doi.org/10.1021/jp408993y
Access rights Closed access
Type Article
Web of Science ID WOS:000328529800040
URI http://repositorio.unifesp.br/handle/11600/37079

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