P. ShunmugaSundaram, R. Shanmugam, A. Elangovan, L. Bruno Chandrasekhar, K. Gurushankar, G. Arivazhagan
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引用次数: 0
摘要
通过共沉淀法合成了本征和掺杂铬(Cr)的硫化锌(ZnS)纳米粒子(NPs)。X 射线衍射(XRD)研究表明,这些纳米粒子呈晶体状,立方相的优先取向为 (111)。尽管铬离子的离子半径大于锌离子,但从 X 射线衍射图谱上看,晶体结构并没有发生明显变化。掺杂导致峰强度降低。随着铬含量的增加,光能带隙值减小,Urbach 指数尾宽增大。当掺杂浓度增加时,微应变减小,晶粒尺寸增大。使用扫描电子显微镜(SEM)进行了表面形貌分析。利用能量色散 X 射线光谱(EDAX)分析了 Zn、S 和 Cr 元素的存在。与 Zn 相比,随着掺杂量的增加,与 Cr 线相对应的强度也在增加,这证明了 Cr 含量的增加。
Structural and Optical Studies on Cr-Doped ZnS Nanoparticles Prepared by Flat Co-precipitation Method
Intrinsic and chromium (Cr) doped zinc sulfide (ZnS) nanoparticles (NPs) have been synthesized by the co-precipitation method. The X-ray diffraction (XRD) studies reveals that the nanoparticles are crystalline in nature with cubic phase that have the (111) as preferential orientation. Even though the Cr ions have ionic radii greater than Zn, no significant modification in the crystal structure occurs as revealed by the XRD pattern. The doping induces a reduction in the peak intensities. The optical energy band gap values decrease and the Urbach exponential tail width increases with an increase in Cr level. When the dopant concentration is increased, the microstrain decreases and crystallite size increases. The surface morphology analysis has been carried out using scanning electron microscopy (SEM). The presence of the elements Zn, S, and Cr has been conformed using energy-dispersive X-ray spectroscopy (EDAX). The intensity that corresponds to Cr lines increases as the dopant increases with respect to Zn which is an evidence of the increased Cr level.
期刊介绍:
The Brazilian Journal of Physics is a peer-reviewed international journal published by the Brazilian Physical Society (SBF). The journal publishes new and original research results from all areas of physics, obtained in Brazil and from anywhere else in the world. Contents include theoretical, practical and experimental papers as well as high-quality review papers. Submissions should follow the generally accepted structure for journal articles with basic elements: title, abstract, introduction, results, conclusions, and references.