Tuesday, 24 May 2005

This presentation is part of: NanoScience and Technology Posters

Generation and Stabilization of Copper Nanoparticles

Moni Chauhan1, Wayne Narain1, Umar Latif2, and Bhanu P.S. Chauhan3. (1) Queensborough Community College, Bayside, NY, (2) bNanomaterials Laboratory of Center for Engineered Polymeric Materials, Department of Chemistry and Graduate Center, City Univer, Staten Island, NY, (3) Nanomaterials Laboratory of Center for Engineered Polymeric Materials, Department of Chemistry, City University of New York, Staten Island, NY

Nanometer-sized particles of metals and semiconductors have been investigated intensively in recent years.1 Generation of Copper Colloids has great and diverse uses because of its catalytic, electrochemical, magnetic and optical properties.2 In our approach to generating copper colloids, a variety of copper salts, stabilizing agents, and solvents were used in order to investigate. In our synthetic approach, we have used PMHS as reducing agent for the generation and in-situ stabilization of nanosized copper reservoirs in organic solvents. This method enables routine formation of stable nanosized copper particles, avoiding particle aggregation during the storage as well as nucleation and growth process. We also demonstrate the utility of such reservoirs in grafting the surface properties of nanoparticles by ligand exchange reactions with a variety of surfactants. Effect of different stabilizing agents was studied in order to investigate the stability profile of copper nanoparticles. Samples analyzed by Transmission Electron Microscope (TEM) reveal copper colloids with particle size between five (5) to ten (10) nanometers (nm). The oxidation state was confirmed by X-ray Photoelectron Spectroscopy (XPS) to be in zero oxidation state which coincides with the UV-visible spectroscopy that revealed copper colloids at 570 nanometers (nm).

1. a. Bhanu P.S. Chauhan, Jitendra Singh Rathore, Moni Chauhan and Alexandra Krawicz. J . Am. Chem. Soc. 2003,125, 2876-2877. 1, b. Bhanu P. S. Chauhan, Jitendra S. Rathore, and Tariq Bandoo J. Am. Chem. Soc. 2004, 126, 8494 2 Chauhan, B. P. S.; Rathore, J. S.; Sardar, R.; Tewari, P.; Latif, U. J. Organomet. Chem. 2003, 686, 24

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