Effects of synthesis method on cation distribution and optical properties of Co/Cr co-doped MgGa2O4 nanoparticles
Effects of synthesis method on cation distribution and optical properties of Co/Cr co-doped MgGa2O4 nanoparticles
复制标题
合成方法对Co/Cr共掺杂MgGa2O4纳米颗粒阳离子分布及光学性能的影响
DOI：
10.1016/j.jallcom.2015.03.229
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发表时间：
2015-08-15
影响因子：
6.2
通讯作者：
Jiang, Huaidong
中科院分区：
文献类型：
--
作者：
Liu, Jian;Duan, Xiulan;Jiang, Huaidong
采用溶胶-凝胶法、共沉淀法和固相反应法制备了Co2+/Cr 3+共掺杂MgGa 2 O 4纳米粒子。利用X射线光电子能谱（XPS）研究了合成方法对Ga 3+、Mg 2+和Cr 3+离子分布的影响。这些阳离子占据八面体网站，以及四面体网站的尖晶石结构在所有样品。然而，这些样品的反转程度受合成方法的影响很大。采用溶胶-凝胶法制备的Co2+/Cr 3+共掺杂MgGa 2 O 4纳米粒子的反型度大于其他方法制备的纳米粒子。研究了合成方法对吸收光谱和发射光谱的影响。溶胶-凝胶法和共沉淀法制备的样品在300-500 nm和500-700 nm两个波长范围内有较宽的吸收峰，而固相法制备的样品在430 nm处有一个吸收峰。吸收光谱的差异可能与Co2+和Cr 3+离子的分布有关。通过溶胶-凝胶和共沉淀法制备的样品的发射光谱显示出在700和680 nm处的宽发射带，结合了八面体Cr 3+和四面体Co 2+离子的发射特性。(C)2015 Elsevier B. V.版权所有。
Co2+/Cr3+ co-doped MgGa2O4 nanoparticles were prepared by three different methods (sol-gel, co-precipitation and solid state reaction). The effect of synthesis method on distribution of cations (Ga3+, Mg2+ and Cr3+ ions) was studied using X-ray photoelectron spectroscopy (XPS). These cations occupied octahedral sites as well as tetrahedral sites of the spinel structure in all samples. However, the inversion degree of these samples is greatly influenced by the synthesis method. The Co2+/Cr3+ co-doped MgGa2O4 nanoparticles prepared by the sol-gel method a larger inversion degree than those prepared by other methods. The effect of the synthesis method on absorption spectra and emission spectra was also studied. Samples obtained by sol-gel and co-precipitation methods exhibit broad absorption bands in two wavelength ranges: 300-500 nm and 500-700 nm, while the sample synthesized by solid state reaction only has an absorption peak at 430 nm in the range 300-500 nm. The difference in absorption spectra can be related to the distribution of Co2+ and Cr3+ ions. Emission spectra for samples prepared by sol-gel and co-precipitation methods show a broad emission band peaking at 700 and 680 nm, combining the emission characteristic of octahedral Cr3+ and tetrahedral Co2+ ions. (C) 2015 Elsevier B.V. All rights reserved.