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Open Access Nano Express

Structural, optical, and magnetic studies of manganese-doped zinc oxide hierarchical microspheres by self-assembly of nanoparticles

Yao-Ming Hao, Shi-Yun Lou, Shao-Min Zhou*, Rui-Jian Yuan, Gong-Yu Zhu and Ning Li

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Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004, People's Republic of China

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Citation and License

Nanoscale Research Letters 2012, 7:100  doi:10.1186/1556-276X-7-100

Published: 2 February 2012

Abstract

In this study, a series of manganese [Mn]-doped zinc oxide [ZnO] hierarchical microspheres [HMSs] are prepared by hydrothermal method only using zinc acetate and manganese acetate as precursors and ethylene glycol as solvent. X-ray diffraction indicates that all of the as-obtained samples including the highest Mn (7 mol%) in the crystal lattice of ZnO have a pure phase (hexagonal wurtzite structure). A broad Raman spectrum from as-synthesized doping samples ranges from 500 to 600 cm-1, revealing the successful doping of paramagnetic Mn2+ ions in the host ZnO. Optical absorption analysis of the samples exhibits a blueshift in the absorption band edge with increasing dopant concentration, and corresponding photoluminescence spectra show that Mn doping suppresses both near-band edge UV emission and defect-related blue emission. In particular, magnetic measurements confirm robust room-temperature ferromagnetic behavior with a high Curie temperature exceeding 400 K, signifying that the as-formed Mn-doped ZnO HMSs will have immense potential in spintronic devices and spin-based electronic technologies.

Keywords:
Mn-doped ZnO; hierarchical microspheres; optical properties; magnetic properties