材料科学
电介质
光致发光
拉曼光谱
兴奋剂
掺杂剂
扫描电子显微镜
分析化学(期刊)
介电损耗
光谱学
纳米颗粒
纳米结构
纳米技术
光电子学
复合材料
光学
化学
物理
量子力学
色谱法
作者
Santanu Das,Sukhen Das,Soumyaditya Sutradhar
标识
DOI:10.1016/j.ceramint.2017.02.116
摘要
Gd3+ and Al3+ co-doped ZnO nanoparticles were prepared by hydrothermal method. The effects of dopants on the microstructural, morphological, optical and dielectric properties of host ZnO system were investigated in the present report. The microstructural and morphological investigations of all the samples were carried out by X-ray diffraction (XRD) and Field emission scanning electron microscopy (FESEM). To investigate the presence of various intrinsic defects inside the undoped and doped ZnO samples, the Raman spectroscopy and photoluminescence spectroscopy measurements were recorded. The dielectric spectroscopy was carried out as a function of frequency and temperature. The consequences of dielectric measurements suggest that the dielectric response of the 3% Gd3+ and Al3+ co-doped ZnO sample is significantly enhanced compared to that of undoped ZnO sample. The dielectric response enhances due to the presence of large amount of oxygen vacancies and grain boundaries in the nanostructure of the doped material. All the dielectric parameters confirm the presence of dielectric dispersion inside the doped ZnO samples. The values of dielectric constant as well as ac conductivities were found to decrease at higher concentration of Gd3+ and Al3+ in the doped ZnO sample and it occurs due to predominating acceptor effect of Al3+ at the interstitial site of ZnO nanostructure.
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