Han Heyou, Cai Yawen, Liang Jiangong, Sheng Zonghai
College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, P. R. China.
Anal Sci. 2007 Jun;23(6):651-4. doi: 10.2116/analsci.23.651.
The interaction of water-soluble CdSe quantum dots (QDs) with gold (Au) nanoparticles was investigated by ultraviolet visible absorption spectroscopy. The results showed that the aggregation of Au nanoparticles was induced by CdSe QDs. The influences of factors such as the size of Au nanoparticles, acidity, buffer concentration and the concentration ratio of the CdSe QDs to Au nanoparticles were each investigated. The comparison of two different particle sizes (16 and 25 nm) of Au nanoparticles that interact with CdSe QDs in the solution showed that the aggregation of small Au nanoparticles (16 nm) is easier than that of big Au nanoparticles (25 nm). At pH 7.0 phosphate buffer solution (0.02 M), the optimal molar ratio of CdSe:Au is about 3100:1 according to calculations.
通过紫外可见吸收光谱研究了水溶性CdSe量子点（QDs）与金（Au）纳米颗粒的相互作用。结果表明，CdSe量子点诱导了Au纳米颗粒的聚集。分别研究了Au纳米颗粒尺寸、酸度、缓冲液浓度以及CdSe量子点与Au纳米颗粒的浓度比等因素的影响。对溶液中与CdSe量子点相互作用的两种不同粒径（16和25 nm）的Au纳米颗粒进行比较，结果表明，小尺寸Au纳米颗粒（16 nm）比大尺寸Au纳米颗粒（25 nm）更容易聚集。在pH 7.0的磷酸盐缓冲溶液（0.02 M）中，根据计算，CdSe:Au的最佳摩尔比约为3100:1。
