Department of Chemistry, University of California, Riverside, California 92521, USA.
Inorg Chem. 2010 Jul 19;49(14):6601-8. doi: 10.1021/ic100473e.
Copper(I) sulfide (Cu(2)S) nanodisks with controllable size and aspect ratio have been synthesized by using a one-pot colloidal process, in which no pre-prepared organometallic precursors are required. The reaction involves the injection of dodecanethiol into a hot solution containing copper salt, surfactants, and a high boiling-point organic solvent. Copper thiolate forms at the beginning of the reaction which effectively acts as a precursor whose decomposition leads to further nucleation and growth of Cu(2)S nanocrystals. The nanocrystals begin as small nanodots in the early stages of the reaction, gradually turning into nanodisks with aspect ratios (average disk diameter divided by thickness) up to 2.0, while the band gap of the nanocrystals decreases accordingly. As the growth of nanocrystals follows the monomer addition mechanism, the diameter, thickness, aspect ratio, and optical property of the Cu(2)S nanodisks can be tuned systematically by changing the reaction time, the amount of surfactants, and the concentration of the precursors. This synthesis provides a simple and highly reproducible method for the preparation of Cu(2)S nanocrystals that may find potential applications in the fabrication of photovoltaic devices.
通过使用一锅胶体工艺，合成了具有可控尺寸和纵横比的硫化亚铜（Cu2S）纳米盘，该工艺不需要预先制备有机金属前体。该反应涉及将十二硫醇注入含有铜盐、表面活性剂和高沸点有机溶剂的热溶液中。反应开始时形成铜硫醇，其有效地作为前体起作用，其分解导致 Cu2S 纳米晶体的进一步成核和生长。纳米晶体在反应的早期阶段开始作为小纳米点，逐渐转变为纵横比（平均圆盘直径除以厚度）高达 2.0 的纳米盘，而纳米晶体的带隙相应减小。由于纳米晶体的生长遵循单体添加机制，因此通过改变反应时间、表面活性剂的量和前体的浓度，可以系统地调节 Cu2S 纳米盘的直径、厚度、纵横比和光学性质。该合成提供了一种简单且高度可重复的制备 Cu2S 纳米晶体的方法，该方法可能在光伏器件的制造中具有潜在应用。
