Synthesis of amorphous palladium selenide nanoparticles via cation exchange and studies of their phase transformation

COLL 217

Stacey E. Wark, swark@mail.chem.tamu.edu, Chih-Hao Hsia, chhsia@mail.chem.tamu.edu, and Dong Hee Son, dhson@mail.chem.tamu.edu. Department of Chemistry, Texas A&M University, College Station, TX 77842
Palladium selenide (PdSe) nanoparticles and CdSe/PdSe core/shell nanoparticles were synthesized through a simple cation exchange reaction between CdSe nanocrystals and Pd salts. The extent of the exchange was dependent on the size and shape of the initial CdSe nanoparticles. Small nanospheres (less than 4nm in diameter) showed only a complete exchange of the cation while in larger nanospheres (greater than 7nm in diameter) core/shell structures were observed. CdSe nanorods showed cation exchange occurring at the tips leading to PdSe tipped nanorods. The reaction product for both partial and complete cation exchange is amorphous PdSe. For the particles with complete cation exchange, the amorphous PdSe can be crystallized upon slow heating with some sintering. The crystallized structure is cubic phase Pd17Se15.
 

Fundamental Research in Colloid and Surface Chemistry
6:00 PM-8:00 PM, Monday, August 20, 2007 BCEC -- East Registration, Poster

Division of Colloid & Surface Chemistry

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