Department of Chemistry, National Tsing Hua University, Hsinchu, 30013, Taiwan.
Chemistry. 2019 Jan 2;25(1):367-372. doi: 10.1002/chem.201804631. Epub 2018 Dec 11.
A simple aqueous-phase synthesis of PbSe nanocubes with tunable sizes has been developed by first preparing a Na SeSO stock solution through dissolution of selenium powder in a solution of Na SO at 90-100 °C for 30 min, and adding part of this solution to a mixture of lead acetate and acetic acid at room temperature with stirring for only 5-8 min to complete the nanocrystal growth. Adjusting the volume of acetic acid and Na SeSO solution added enabled the size of the nanocrystals to be tuned, with average edge lengths of 13 to 121 nm attained. Changes in solution color revealed very different crystal growth rates for the 13 and 121 nm nanocubes. The PbSe cubes exhibit size-dependent absorption bands in the ultraviolet and visible-light region; the band positions show progressive redshifts with increasing particle size. Slight photocatalytic activity upon 532 nm laser irradiation of the nanocubes suggests the presence of higher energy levels in the band structure of PbSe. The synthetic conditions can be easily scaled up to obtain a large quantity of PbSe nanocubes for applications.
通过先在 90-100°C 的 Na 2 SO 3 溶液中溶解硒粉 30 分钟制备 Na 2 SeSO 3 储备溶液，然后在室温下向醋酸铅和醋酸的混合物中加入部分该溶液并搅拌 5-8 分钟，完成纳米晶体生长，开发了一种简单的水相合成法，可制备具有可调尺寸的 PbSe 纳米立方体。通过调节加入的醋酸和 Na 2 SeSO 3 溶液的体积，可以调整纳米晶体的尺寸，得到的平均边长为 13 到 121nm。溶液颜色的变化表明 13nm 和 121nm 纳米立方体的晶体生长速率非常不同。PbSe 立方体在紫外光和可见光区域表现出尺寸依赖性的吸收带；随着粒径的增加，带位置逐渐红移。纳米立方体在 532nm 激光照射下表现出轻微的光催化活性，表明 PbSe 的能带结构中存在更高的能级。该合成条件可以很容易地扩展到获得大量的 PbSe 纳米立方体用于应用。
