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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。
Zinc acetate as the zinc source, thioacetamide (TAA) as the sulfur source, starch as the dispersant, microwave assisted synthesis of zinc sulfide (ZnS) nanocrystals. The influence of microwave temperature on the structure and grain size of ZnS was studied, and the formation mechanism was discussed. The structures of the samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), UV-Vis and fluorescence spectrophotometer FL) characterization and analysis of the phase, morphology, chemical bonding properties and optical properties. The results show that the prepared sample is pure sphalerite cubic phase ZnS, the lattice constant is 0.5196nm; the grain size increases with increasing temperature; the particle size distribution is narrower and the particle size is 100 ~ 160nm; Is 3.85eV. Compared with the band gap of bulk material, E_g = 3.68eV, a blue shift may occur due to the quantum confinement effect and the morphology of the material. There are one main emission peak and a shoulder peak in the measured sample, In the blue-green spectral band, due to surface defects and near-band edge emission.