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 e V,表现出明显的量子尺寸效应。 With silver laurate and sodium sulfide as raw materials and polyvinylpyrrolidone as protective agent, only about 0.5 h at room temperature, the average particle size of about 35 nm of silver sulfide particles were synthesized. Studies have shown that the presence of polyvinylpyrrolidone and sodium sulfide is a necessary condition for the formation of rice granular features; and the relatively high sodium sulfide concentration shortens the time for the formation of rice granular features. Compared with the bulk silver sulfide, the absorption edge of the obtained rice-like nano-silver sulfide in the UV-visible absorption spectrum shows a blue shift with a direct band gap of 4.4 eV, showing obvious quantum size effect.