Preparation of CdS nanoparticles in salt-induced block copolymer micelles

2019-11-22 21:10:47

spectra nanoparticles CdS block micelles

责任者: Hanying Zhao;Douglas, E.P.;Harrison, B.S.;Schanze, K.S. 单位: Dept. of Mater. Sci. & Eng., Florida Univ., Gainesville, FL, USA 来源出处: Langmuir(Langmuir (USA)),2001/12/25,17(26):8428-33 摘要: A novel preparation method of CdS nanoparticles with controllable size and stability is presented. Poly(styrene-block-2-vinylpyridine) (PS-b-P2VP) and cadmium ions form aggregates of single micelles called compound micelles, upon addition of the cadmium acetate salt into a solution of the block copolymer in tetrahydrofuran. The growth of CdS nanoparticles is confined to the core of single micelles after introduction of hydrogen sulfide gas into the solution. UV-visible spectroscopy, fluorescence spectroscopy, and transmission electron microscopy were employed to characterize the prepared nanoparticles. UV-visible absorption spectra show that larger nanoparticles are produced at lower 2VP:Cd2+ molar ratio. UV-visible absorption spectra and fluorescence spectra both indicate that with a decrease of block copolymer concentration in tetrahydrofuran, the size of the CdS nanoparticles decreases. The stability of the CdS nanoparticles and micelles was also investigated. UV-visible results show that the prepared CdS nanoparticles have good colloidal stability 关键词: cadmium compounds;colloids;fluorescence;II-VI semiconductors;nanostructured materials;transmission electron microscopy;ultraviolet spectra;visible spectra;nanoparticles;poly(styrene-block-2-vinylpyridine);aggregates;compound micelles;UV-visible spectroscopy;fluorescence;transmission electron microscopy;absorption spectra;block copolymer concentration;tetrahydrofuran;colloidal stability;CdS