Synthesis of metallic nanoparticles directed by polymers

INOR 637

Weihong Cui, weihongc@sas.upenn.edu1, Michael Fryd1, Jung H Park, jnpark@seas.upenn.edu2, Russell J. Composto, composto@seas.upenn.edu2, and Bradford B Wayland, Wayland@sas.upenn.edu1. (1) Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, (2) Department of Materials Science and Engineering, University of Pennsylvania, 3231 walnut street, Philadelphia, PA 19104-6272
The homopolymer and amphiphilic block copolymers of poly(2-dimethylamino)ethyl methacrylate (PDMAEMA) are used to direct the preparation of platinum and platinum alloy nanoparticles in water and organic solvents, respectively. The multiple interactions between the amino groups on the polymers and the metal precursor enforce the stabilization effect introduced by the microstructure of the polymers in solution. Well dispersed Pt colloid particles with narrow size distribution were readily generated from the reduction of H2PtCl6 by ascorbic acid in both aqueous solution and THF with the assistance from PDMAEMA polymers. Various amphiphilic block copolymers with different metal ion binding sites doped in the PDMAEMA block are also prepared to tune the metal ion redox properties. The formation of specific block copolymer stabilized metal particles was studied by ultraviolet-visible spectroscopy, atomic form microscopy and transmission electron microscopy.
 

Nanoscience: Synthesis and Characterization
7:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007