Abstract

Zinc sulfide ZnS nanopowders were prepared by chemical deposition from aqueous solutions of zinc nitrate and sodium sulfide in the presence of sodium citrate or Trilon B. ZnS/Ag₂S heteronanostructures were prepared by two-step chemical codeposition of zinc and silver sulfides. The prepared ZnS nanopowders had average particle sizes ranging from 2 to 10 nm depending on the reagent concentration ratio in the batch. The nanoparticle sizes in the thus-prepared heteronanostructures were 8–10 nm. The diffuse reflectance spectra of nanostructured ZnS and ZnS/Ag₂S heteronanostructures were measured. The bandgap width E_g in the studied sulfide nanostructures was assessed based on an examination of the measured optical absorption spectra. As the nanoparticle size decreased from 10 to 2 nm, the E_g in ZnS nanopowders increased in the range 3.59–3.72 eV. The increasing Ag₂S percentage in ZnS/Ag₂S heteronanostructures leads to narrowing of the bandgap. Pulsed cathodoluminescence (PCL) spectra were recorded. The luminescence characteristics of ZnS and ZnS/Ag₂S depend on the preparation method and nanoparticle morphology.

中文翻译：

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ZnS纳米粉和ZnS / Ag 2 S杂纳米结构：合成与性能

摘要

硫化锌ZnS纳米粉体是通过在柠檬酸钠或Trilon B存在下从硝酸锌和硫化钠的水溶液中化学沉积制备的。ZnS / Ag ₂ S异质纳米结构是通过硫化锌和硫化银的两步化学共沉积制备的。所制备的ZnS纳米粉体的平均粒径取决于批次中试剂的浓度比，范围为2至10 nm。如此制备的异质纳米结构的纳米颗粒大小为8-10 nm。测量了纳米结构的ZnS和ZnS / Ag ₂ S异质结构的漫反射光谱。带隙宽度E _g在所研究的硫化物纳米结构中，基于对所测得的光吸收光谱的评估，对纳米线进行了评价。随着纳米颗粒尺寸从10 nm减小到2 nm，ZnS纳米粉中的E _g在3.59–3.72 eV范围内增加。ZnS / Ag ₂ S异质纳米结构中不断增加的Ag ₂ S百分比导致带隙变窄。记录脉冲阴极发光（PCL）光谱。ZnS和ZnS / Ag ₂ S的发光特性取决于制备方法和纳米颗粒的形貌。