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Autumn 2008 Seminar Series
Monday, December 1, at 3:30 p.m.
Room 264 MacQuigg Labs
Inhee Lee
PhD Candidate advised by Dr. Sheikh Akbar
Department of Materials Science and Engineering
The Ohio State University
Li-electrolyte based CO2 sensors for a wide temperature range
Abstract
CO2 gas sensors are being developed to monitor the environment because CO2 contributes to global warming. Moreover, CO2 gas significantly influences many industrial sectors through such processes as affecting the corrosion rate of equipment during chemical processing and controlling combustion in automotive applications. Because of these applications, inexpensive and reliable solid-state gas sensors with low power consumption have been in demand for several years. Recently, CO2 monitoring is required for measurements of respiratory or bio-related activities. Especially, since astronaut breathes out CO2 in the closed spacesuit, CO2 concentrations would build up to deadly levels. In order to remove excess CO2 from the spacesuit atmosphere, CO2 concentrations must be monitored at low temperatures.
A potentiometric CO2 sensor was prepared using lanthanum lithium titanate (La2/3-xLi3xTiO3) as an electrolyte with lithium carbonate (Li2CO3; referred to as L) or mixture of lithium carbonate and cerium oxide (Li2CO3 + CeO2; referred to as LC) as a sensing electrode. CO2 sensing properties were investigated in the range of 400 to 2500 ppm under dry conditions between 200°C and 300°C. The sensor with the LC electrode showed better performance compared to that with the L electrode with fast response time, good recovery and appreciable sensitivity at low temperatures.
Bio
Inhee received his B.S. and M.S. degree in Materials Science and Engineering in 1997 from Hanyang University and in 1999 from Seoul National University, respectively. Before joining the Ohio State University in September 2005, he worked for Samsung as a process engineer. He is currently a graduate student advised by Dr. Sheikh Akbar pursuing a PhD in Materials Science and Engineering.
