Aqueous chemical route synthesis and the effect of calcination temperature on the structural and optical properties of ZnO nanoparticles
Aqueous chemical route synthesis and the effect of calcination temperature on the structural and optical properties of ZnO nanoparticles
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DOI：
10.1016/j.jmrt.2014.07.001
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发表时间：
2014-10-01
影响因子：
6.4
通讯作者：
Haque, Fozia Z.
中科院分区：
文献类型：
--
作者：
Parra, Mohammad Ramzan;Haque, Fozia Z.
本文报道了在不加入任何封盖剂的情况下，通过简单的水化学方法合成了尺寸可控的ZnO纳米颗粒。研究了不同焙烧温度对ZnO纳米颗粒尺寸的影响。x射线衍射（XRD）结果表明，所有样品均具有结晶纤锌矿相，并利用Scherrer方程和Williamson-Hall （W-H）法对样品的平均晶粒尺寸和晶格应变进行了峰展宽分析。利用原子力显微镜（AFM）和能量色散x射线（EDX）扫描电镜（SEM）对其形貌和元素组成进行了研究。根据Scherrer公式和W-H分析，ZnO纳米颗粒的平均晶粒尺寸随着煅烧温度的升高而增大。这些结果与原子力显微镜的结果一致。在扩散反射（DR）模式下，利用UV-vis光谱研究了材料的光学特性，在375 nm处反射率急剧增加，在500℃煅烧温度下，在420 nm处具有较强的反射特性。此外，光致发光光谱结果显示，当煅烧温度从200℃升高到500℃时，ZnO纳米颗粒的紫外发射强度增强，缺陷浓度降低，带隙能略有变化。这表明，该ZnO纳米颗粒具有带隙可调性，可作为光电器件的窗口层。(C) 2014巴西冶金、材料和矿业协会。由爱思唯尔编辑有限公司出版。
This article reports the controlled size of ZnO nanoparticles synthesized via simple aqueous chemical route without the involvement of any capping agent. The effect of different calcination temperatures on the size of the ZnO nanoparticles was investigated. X-ray diffraction (XRD) results indicated that all the samples have crystalline wurtzite phase, and peak broadening analysis was used to evaluate the average crystallite size and lattice strain using Scherrer's equation and Williamson-Hall (W-H) method. Morphology and elemental compositions were investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM) with energy-dispersive X-ray (EDX) spectroscopy. The average crystallite size of ZnO nanoparticles estimated from Scherrer's formula and W-H analysis was found to increase with the increase in calcination temperature. These results were in good agreement with AFM results. Optical properties were investigated using UV-vis spectroscopy in diffused reflectance (DR) mode, with a sharp increase in reflectivity at 375 nm and the material has a strong reflective characteristic after 420 nm at 500 degrees C calcination temperature. Furthermore, photoluminescence spectroscopic results revealed intensive ultraviolet (UV) emission with reduced defect concentrations and a slight shifting in band gap energies with increased calcination temperature from 200 degrees C to 500 degrees C. This study suggests that the as-prepared ZnO nanoparticles with bandgap tunability might be utilized as window layer in optoelectronic devices. (C) 2014 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda.