In Situ Formation of Au/Pt Bimetallic Colloids on Polystyrene Microspheres: Control of Particle Growth and Morphology

• DOI: 10.1021/cm011634n
• Publication Date: 2002-07-26T06:10:30Z
• Authors: Chun-Wei Chen; Takeshi Serizawa; Mitsuru Akashi
• Keywords: Polystyrene; Dispersity; Bimetallic strip

This paper reports in situ formation of Au/Pt bimetallic nanoparticles on the surface polystyrene microspheres. was accomplished by dispersion copolymerization styrene and a poly(N-isopropylacrylamide) (PNIPAAm) macromonomer ethanol−water media presence HAuCl4 H2PtCl6. The particle size morphology microspheres can be changed varying molar ratio Au/Pt. propagation oligomer radicals nucleation were controlled ratio. A monodisperse microsphere, with as core PNIPAAm corona, obtained at 2/8. Well-dispersed generated microsphere via reduction gold platinum ions from initiator, 2,2'-azobisisobutyronitrile (AIBN). mean diameter colloids decreased increasing Pt fraction. growth formed nuclei became controllable higher ratios owing to lower rate strong coordination affinity atoms. materials resulting this study characterized transmission electron microscopy (TEM); atomic force (AFM); FTIR, UV−visible, X-ray photoelectron spectroscopy.