Optical and Structural Properties of ZnO and ZnO:Cd Particles Grown by the Hydrothermal Method
Optical and Structural Properties of ZnO and ZnO:Cd Particles Grown by the Hydrothermal Method
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DOI：
10.1111/jace.13460
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发表时间：
2015-05
影响因子：
3.9
通讯作者：
D. A. Guzmán-Embús;M. F. Vargas-Charry;C. Vargas-Hernández
中科院分区：
文献类型：
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作者：
D. A. Guzmán-Embús;M. F. Vargas-Charry;C. Vargas-Hernández
在这里，我们研究了通过水热法合成的 ZnO 颗粒的结构、振动、光学和形态特性，通过摩尔比 Rm = Cd+2/Zn+2 掺入不同浓度的镉并在 500°C 下进行热处理。 X射线衍射结果表明具有纤锌矿型六方结构的ZnO化合物具有高结晶度。拉曼散射光谱表明，ZnO 振动模式出现在 200 至 1300 cm−1 之间的区域，这与 ZnO 分子的不同振动构型特征相关：E2(低)、E2(M)、A1(TO)、E1(TO)、2B1(高)、E2(高)和 TA + LO。受 Cd2+ 掺入影响最大的模式是分配给 2E2（低）、E2（M）和 2B1（高）的模式，这种效应与 Zn2+ 离子的更大位移有关。光学研究表明，由于 ZnO 晶格中 Cd2+ 的替代，带隙减小，晶体质量下降。镉的掺入影响了 ZnO:Cd 颗粒的形态，改变了 ZnO 棒的长度和直径；当Cd浓度增加时，ZnO棒缩短，形成硬币型六边形结构。
Here, we examine the structural, vibrational, optical, and morphological properties of ZnO particles synthesized by the hydrothermal method, incorporating cadmium at different concentrations through the molar ratio Rm = Cd+2/Zn+2 and a thermal treatment at 500°C. The X-ray diffraction results demonstrated the high crystallinity of the ZnO compound with a wurtzite-type hexagonal structure. The Raman scattering spectra demonstrated that the ZnO vibrational modes occur in the region between 200 and 1300 cm−1, which is associated with different vibrational configurations characteristic of the ZnO molecule: E2(Low), E2(M), A1(TO) E1(TO), 2B1(High), E2(High), and TA + LO. The modes that were most affected by the incorporation of Cd2+ were those assigned to 2E2(Low), E2(M), and 2B1(High), and this effect was associated with a greater displacement of Zn2+ ions. The optical study showed a reduction in the band gap and a decrease in the crystalline quality due to the substitution of Cd2+ in the ZnO lattice. Cadmium incorporation affected the morphology of the ZnO:Cd particles, changing the lengths and diameters of the ZnO rods; when the Cd concentration was increased, the ZnO rods shortened, forming coin-type hexagonal structures.