The influence of Fe doping on the structural, magnetic and optical properties of nanocrystalline ZnO particles
The influence of Fe doping on the structural, magnetic and optical properties of nanocrystalline ZnO particles
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DOI：
10.1016/j.jmmm.2011.07.059
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发表时间：
2012-03
影响因子：
2.7
通讯作者：
R. Saleh;S. P. Prakoso;Adel Fishli
中科院分区：
文献类型：
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作者：
R. Saleh;S. P. Prakoso;Adel Fishli
我们报告的铁掺杂纳米ZnO粒子的研究结果，使用共沉淀法合成的掺杂浓度从5到31at%。为了了解掺杂剂如何影响纳米ZnO颗粒的结构、磁性和光学性质，采用了X射线衍射、能量色散X射线光谱、红外吸收光谱、紫外-可见光谱、电子自旋共振谱（ESR）和振动样品磁强计。从X射线衍射分析，我们的Fe掺杂的纳米ZnO颗粒被确定为具有纤锌矿晶体结构和晶胞体积随着掺杂浓度的增加而增加。当Fe含量高于21at%时，出现了杂质相。通过红外光谱进一步研究了样品的结构，在400- 700 cm − 1范围内观察到一个宽而强的吸收带，在3400 cm − 1附近观察到-OH伸缩振动模式。紫外-可见光测量表明，随着Fe含量的增加，能隙减小，这可能是由于晶格参数的增加。磁性测量结果表明，所有样品的铁磁行为。ESR结果表明，存在的两个价态Fe 2+和Fe 3+的铁。
We report the results of an investigation of Fe-doped nanocrystalline ZnO particles synthesized using the co-precipitation method with doping concentrations from 5 up to 31at%. To understand how the dopant influenced the structural, magnetic and optical properties of nanocrystalline ZnO particles, X-ray diffraction, energy dispersive X-ray spectroscopy, infrared absorption spectroscopy, UV–vis spectroscopy, electron spin resonance spectroscopy (ESR) and vibrating sample magnetometer were employed. From the analysis of X-ray diffraction, our Fe-doped nanocrystalline ZnO particles are identified as having the wurtzite crystal structure and the unit cell volume increases with increasing doping concentrations. However, impurity phases are observed for Fe contents higher than 21at%. Sample structures were further studied by infrared spectra, from which a broad and strong absorption band in the range of 400–700cm−1and –OH stretching vibrational mode at approximately 3400cm−1were observed. Ultraviolet–visible measurements showed a decrease in the energy gap with increasing Fe content, probably due to an increase in the lattice parameters. Magnetic measurements showed a ferromagnetic behavior for all samples. ESR results indicate the presence of Fe in both valence states Fe2+and Fe3+.