微波-淀粉辅助合成ZnS纳米晶及其光学性能研究

发布时间：2018-01-14 07:28

本文关键词：微波-淀粉辅助合成ZnS纳米晶及其光学性能研究　出处：《化工新型材料》2017年07期 　论文类型：期刊论文

【摘要】：以乙酸锌为锌源,硫代乙酰胺(TAA)为硫源,淀粉为分散剂,微波辅助合成了硫化锌(ZnS)纳米晶。研究了不同微波温度对ZnS结构和晶粒大小的影响,并对形成机理进行了探讨。通过X射线衍射仪(XRD)、透射电子显微镜(TEM)、电子扫描显微镜(SEM)、傅里叶红外光谱(FT-IR)、紫外-可见吸收光谱(UV-Vis)和荧光分光光度计(FL)对物相、形貌、化学键合性质和光学性能等方面,进行了表征分析。结果表明:制得的样品为纯闪锌矿立方相ZnS,晶格常数为0.5196nm;晶粒大小随着温度增加而增大;粒径分布较窄,粒径100~160nm;禁带宽度处为3.85eV,与体相材料的禁带宽度E_g=3.68eV相比,发生了蓝移,可能是量子限域效应和材料形貌所致;所测样品有1个主发射峰和肩峰,处于蓝绿光谱段,归因于表面缺陷和近带边发射。
[Abstract]:Zinc acetate was used as zinc source, thioacetamide (TAA) as sulfur source and starch as dispersant. Zinc sulfide nanocrystals were synthesized by microwave-assisted synthesis. The effects of microwave temperature on the structure and grain size of ZnS were studied, and the formation mechanism was discussed. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR). Ultraviolet-visible absorption spectra (UV-Vis) and fluorescence spectrophotometer (FLL) on the phase, morphology, chemical bonding properties and optical properties. The results show that the sample is pure sphalerite cubic phase ZnS with lattice constant of 0.5196 nm. The grain size increases with the increase of temperature. The particle size distribution is narrower, the particle size is 100 ~ 160nm; The band gap is 3.85 EV. Compared with the bulk material, the band gap E _ g _ (3.68) EV shows a blue shift, which may be due to the quantum limiting effect and the morphology of the material. There are one main emission peak and shoulder peak in the blue-green spectrum due to surface defects and near-band emission.
【作者单位】：湖南人文科技学院材料与环境工程学院精细陶瓷与粉体材料湖南省重点实验室;
【基金】：湖南省教育厅一般科研项目(14C0607);湖南省教育厅重点科研项目(14A076) 湖南省科技创新平台与人才计划(2016TP1028)
【分类号】：O614.241;TB383.1
【正文快照】： 硫化锌(Zn S)在室温下禁带分别为3.68和3.80e V[1-2],广泛应用于发光二极管、太阳能电池、光电器件、发光纳米复合材料、光催化、环境传感器和生物传感器等领域[3-6]。Zn S纳米晶的光学性能主要取决于粒子尺寸和形貌。近年来,Zn S纳米结构和尺寸可控研究,成为热点。众所周知,

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