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Autumn 2008 Seminar Series
Friday, October 31, at 3:30 p.m.
Room 264 MacQuigg Labs
Andrei Kolmakov
Assistant Professor
Department of Physics
Southern Illinois University Carbondale
Understanding of Metal Oxide Nanowire Chemical Sensors
Abstract
Metal oxide nanowires implemented as chemiresistors and chemi-FETs demonstrate excellent transduction of the surface processes into electron/hole transport properties and, as such, can be considered as a prospective platform for the next generation of the gas
sensors. On the other hand, the fundamental understanding of the surface properties and
their interplay with the electron/hole transport and optical properties of the nanowires
is still in its infancy. The latter is mostly linked to experimental challenges in the
fabrication and characterization of these new active elements. In this presentation we will demonstrate an applicability of a range of spectroscopy and imaging techniques to understand the local transport particularities taking place in the individual operating metal oxide nanostructure sensor. In addition, the influence of surface sensitization with catalyst
particles as well as radiation defects on the surface reactivity, selectivity and
electron transport will be discussed. We also discuss our recent progress on comparative
imaging and gas sensing experiments conducted in a vacuum and in ambient pressure to
bridge the so-called pressure gap. Finally, Òreal worldÓ prototype devices such as gas sensors and e-noses based on metal oxide nanowires will be addressed.
Bio
Prof. Andrei Kolmakov specializes in surface science, transport properties, and imaging techniques of nano-objects relative to gas sensing and catalysis. He has authored or co-authored over 70 technical papers, including 2 book chapters and 5 review articles. He received his MS in physics from Moscow Physical Technical Institute in 1986. He started his research work as a staff member at the Russian Research Center Kurchatov Institute in Moscow, where he completed his PhD in solid-state physics in 1996. After his previous appointment as associate researcherat UCSB he joined in 2005 the Physics Department at Southern Illinois University at Carbondale, as an Assistant Professor. In addition to his research and educational duties,he currently serves as an editorial board member for Research Letters in Nanotechnology and Science of Advanced Materials. His research is currently funded by Petroleum Research Fund and Caterpillar Inc.
Please join our speaker for light refreshments in 479 Watts Hall following the talk.
