title: A facile method to prepare CdS/polystyrene composite particles.
abstract: Nano-CdS/polystyrene composite particles were prepared via surfactant-free emulsion polymerization. 2-(Dimethylamino)ethyl methacrylate (DMEMA) was used as auxiliary monomer which co-polymerized with styrene (St) and provided the location for coordinating with Cd(2+). By the coordination of Cd(2+) ions to DMEMA, mono-disperse polystyrene with the Cd(2+) ions on the particles surface were prepared successfully. With the release of S(2-) ions from the thioacetamide (TAA), cadmium sulfide (CdS) was formed. Nano-CdS/PS composite particles could be synthesized via this facile method. The order of materials addition and the amount of initiator both are playing important roles to the final morphologies of the composite particles. In the method proposed in this study, no surfactant was used, and the stable emulsion was successfully obtained. UV-vis absorption and fluorescence measurement indicated the quantum dot effect in the resulted nano-CdS/PS composite particles. The possible composite particle formation mechanism was presented.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, PR China.
authors.forename: Xinjian
authors.initials: X
authors.lastname: Cheng
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhao
authors.forename: Yingkui
authors.initials: Y
authors.lastname: Yang
authors.forename: Sie Chin
authors.initials: SC
authors.lastname: Tjong
authors.forename: Robert K Y
authors.initials: RK
authors.lastname: Li