Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, USA.
J Am Chem Soc. 2009 Apr 22;131(15):5691-7. doi: 10.1021/ja9005767.
A method for the synthesis of nearly monodisperse CuInS(2) semiconductor nanocrystals (from <2 to 20 nm) was developed using generic and air-stable chemicals in a non-coordinating solvent. Such "greener" approaches also allowed the reaction temperatures to be below 200 degrees C. By introducing reactivity-controlling ligands for Cu, namely thiols, control of the Cu:In stoichiometric ratio in the nanocrystals was achieved. Amines were identified as catalytic reagents for the rapid oxidation of the CuInS(2) nanocrystals, which could be prevented by the formation of CuInS(2)/ZnS core/shell nanocrystals by a one-pot approach. CuInS(2)/ZnS core/shell nanocrystals also showed greatly improved optical properties, with photoluminescence quantum yield up to about 30% and an emission peak position tunable from 500 to 950 nm. The versatility of the synthetic strategy was demonstrated by extending it to the synthesis of AgInS(2) nanocrystals by simply replacing the copper salt by a silver salt.
一种使用通用且稳定的化学物质在非配位溶剂中合成近单分散 CuInS(2) 半导体纳米晶体（尺寸为 2 至 20nm）的方法被开发出来。这种“更环保”的方法还允许反应温度低于 200°C。通过引入用于 Cu 的反应性控制配体，即硫醇，可以控制纳米晶体中的 Cu:In 化学计量比。胺被确定为快速氧化 CuInS(2)纳米晶体的催化试剂，但可以通过一锅法形成 CuInS(2)/ZnS 核/壳纳米晶体来防止。CuInS(2)/ZnS 核/壳纳米晶体还表现出大大改善的光学性质，光致发光量子产率高达约 30%，发射峰位置可从 500nm 调谐到 950nm。通过简单地用银盐代替铜盐，将该合成策略扩展到 AgInS(2) 纳米晶体的合成，证明了该合成策略的多功能性。
