title: Interactions between water-soluble CdSe quantum dots and gold nanoparticles studied by UV-visible absorption spectroscopy.
abstract: 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.
authors.affiliation: College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, P. R. China. hyhan@mail.hzau.edu.cn
authors.forename: Heyou
authors.initials: H
authors.lastname: Han
authors.forename: Yawen
authors.initials: Y
authors.lastname: Cai
authors.forename: Jiangong
authors.initials: J
authors.lastname: Liang
authors.forename: Zonghai
authors.initials: Z
authors.lastname: Sheng
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; D006046:Gold; C058667:cadmium selenide