COLL 165 |
| Emil A Hernandez1, Bertina Posada1, Roberto Irizarry2, and Miguel E. Castro1. (1) Department of Chemistry, The University of Puerto Rico at Mayaguez, Chemical Imaging Center and, Center for Chemical Sensor Development, Mayaguez, PR PR 00681, (2) Dupont Microelectronics, Manati, PR |
| Silver nanowires and nanowire assemblies have tremendous technological applications in selective sensing and electronic devices. It is well known that reduction of silver cations in solution leads to the formation of both silver rods and spheres. While numerous methods have been designed to the selective synthesis of spheres, little effort has been given to the development of wet chemical approaches to the selective synthesis of nanowires. We have developed a one-step-two-reactant approach to the synthesis of nearly mono disperse silver nanowires. The approach is based in wet chemical methods. Scanning electron microscopy measurements reveals that the approach used results in the synthesis of nanowires with a 100 % selectivity. Evidence for the formation of silver nanospheres was searched for in scanning electron microscopy measurements, but not found. Nanowire diameter and lentgh depend on initial reactants concentrations and can be up to about 200 nm in diameter and 5 micrometers long, with aspect ratios up to 25. The surface chemistry of these nanowires is explored with state-of-the-art near field optical microscopy (NSOM) measurements in the transmission mode and surface reflection FTIR and X-ray photoemission measurements. Results from ongoing work on the attachment of silver nanowires to gold nanoparticle surfaces (using chemical methods) for mass production of nanoscaled electrical circuits will also be presented. *Financial support from the National Science Foundation, grant number 0304348, and the PR AMP program are greatefully acknowleged. |
|
Nanoscience and Nanotechnology
2:00 PM-5:15 PM, Monday, March 29, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |
