直接合成水溶性的超薄 CdS 纳米棒，并通过堿度实现溶解度的可逆调节。

Direct synthesis of water-soluble ultrathin CdS nanorods and reversible tuning of the solubility by alkalinity.

机构信息

Department of Chemistry, Tsinghua University, Beijing, 100084 People's Republic of China.

出版信息

J Am Chem Soc. 2010 Feb 17;132(6):1819-21. doi: 10.1021/ja909776g.

PMID:20102210

Abstract

Highly water-soluble ultrathin and fluorescent CdS nanorods are directly synthesized with the assistance of PEI. PEI plays as the passivator to control and induce the growth of the CdS nanorods and also makes the as-obtained nanorods dispersible in water. The as-obtained CdS nanorods are quite thin thus showing the quantum effect in the fluorescence. By adjusting the alkalinity of the solution, CdS nanorods can be controlled to precipitate or redisperse in water, which is believed to stem from the variation of the charges of the capping PEI molecules. These results provide an efficient and convenient way to directly synthesize water-soluble and fluorescent nanocrystals, which has potential application in biological labeling and detection.

摘要

在聚醚酰亚胺（PEI）的辅助下，直接合成了高水溶性的超薄荧光 CdS 纳米棒。PEI 既作为稳定剂控制和诱导 CdS 纳米棒的生长，又使所得纳米棒在水中具有良好的分散性。所获得的 CdS 纳米棒非常薄，因此在荧光中表现出量子效应。通过调节溶液的碱度，可以控制 CdS 纳米棒在水中沉淀或再分散，这被认为源于封端 PEI 分子电荷的变化。这些结果为直接合成水溶性和荧光纳米晶体提供了一种有效和方便的方法，在生物标记和检测方面具有潜在的应用。