米粒状纳米硫化银的制备及其光学性能

摘要

以月桂酸银、硫化钠为原料,聚乙烯吡咯烷酮为保护剂,室温下仅0.5 h即合成了平均长度约35 nm的米粒状硫化银颗粒。研究表明,聚乙烯吡咯烷酮和硫化钠的存在是形成米粒状特征的必要条件;且相对较高的硫化钠浓度可缩短米粒状特征形成的时间。与大块硫化银相比,所得米粒状纳米硫化银的紫外-可见吸收光谱中吸收边明显蓝移,直接禁带宽度达到4.4 eV,表现出明显的量子尺寸效应。

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	刘晶晶
	李小丽
	王虹

关键词：半导体材料；纳米硫化银；纳米米粒；光学性能

Abstract：

Silver sulfide (Ag₂S) nanorice with an average length of about 35 nm has been synthesized at room temperature just in 0.5 h using silver laurate and sodium sulfide as raw materials, polyvinylpyrrolidone as protective agent in aqueous solution. It was found that the formation of the rice-shape featured Ag₂S nanoparticles depended mainly on the presence of polyvinylpyrrolidone and sodium sulfide. What's more, if the concentrations of sodium sulfide were increased, the time for the formation of the rice-shape featured would be shortened. Compared with bulk silver sulfide, the obtained Ag₂S nanorice showed clear quantum confinement effect, which was testified by the remarkable blue shift of its UV-visible absorption edge and the large band gap energy of 4.4 eV.

Keywords： semiconductor materials； silver sulfide nanoparticles； nanorice； optical properties

Received 2014-03-16;

Fund:

国家自然科学基金项目(50673075)。

Corresponding Authors: 王虹, E-mail: hongwang@tju.edu.cn。 Email: hongwang@tju.edu.cn

About author: 刘晶晶(1989-),女,硕士研究生,现从事无机纳米材料的研究。

引用本文:

刘晶晶, 李小丽, 王虹.米粒状纳米硫化银的制备及其光学性能[J]. 化学工业与工程, 2016,33(1): 61-65

Liu Jingjing, Li Xiaoli, Wang Hong.Synthesis and Optical Properties of Silver Sulfide Nanorice[J]. Chemcial Industry and Engineering, 2016,33(1): 61-65

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