中文摘要：

选用TX-100/环己烷/正己醇/水反相微乳体系,以Ag NO_3为Ag源、Na_2S·9H2O为S源、L-半胱氨酸为结构导向剂,室温下制备了高晶化度、直径为10—50 nm的Ag_2S纳米晶,并考察了影响其粒径大小的因素。紫外-可见吸收光谱表明,Ag_2S纳米晶在290 nm处呈现强吸收,与体相Ag2S（1 240 nm）相比,其吸收边发生了明显的蓝移。通过调控微乳体系中ω0（水与表面活性剂物质的量比）、Ag＋与L-半胱氨酸的物质的量比、反应物浓度等可以实现对产物尺寸和形貌的调控。

英文摘要：

Ag2S nanoparticles with a diameter of 10--50 nm were successfully fabricated at ambient temperature in a TX-100/cy- clohexane/hexanol/water inverse microemulsion system in the presence of AgNO3 as a Ag source,Na2 S · 9H2O as a sulfur source and L-cysteine as the coordinating agent. The factors influencing sizes and morphologies of Ag2S nanoparticles were studied. The as-obtained Ag2S nanocrystals exhibit strong absorption in UV region, with an absorption edge at around 290 nm. Compared with that of bulk Ag2S （1 240 nm）,the absorption edge exhibits an obvious blue-shift. The particle sizes and morphologies of Ag2S nanocrystals could be readily controlled by adjusting the molar ratio of Ag ＋/ L-cysteine, the molar ratio of water to surfactant （ω0） as well as the concentration of reactants.