270941 CeO2 Nanofibers for in-Situ O2 and CO Sensing in Harsh Environment

Thursday, November 1, 2012: 3:15 PM
Washington (Westin )
Yixin Liu1, Lichun Zhang2, Puxian Gao3 and Yu Lei1, (1)Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, CT, (2) Institute of Materials Science, University of Connecticut, (3)Institute of Materials Science, University of Connecticut, Storrs, CT

As the most common type of harsh environment sensors, high temperature gas sensors are paramountly important to improve combustion efficiency and control emissions. In this study, large scale and polycrystalline CeO2 nanofibers were prepared using a facile two-step synthesis route including electrospinning and calcination. The structure and composition of nanofibers were characterized by SEM and X-ray diffraction.The as-prepared CeO2 nanofibers show good morphological and structural stability at high temperature environment (800~1000 oC). CeO2 nanofibers were further employed for in-situ, real-time oxygen (O2) and carbon monoxide (CO) sensing at 800 oC and 1000 oC, respectively, both of which showed sensitive, reversible, and reproducible response. To the best of our knowledge, the good sensitivity of the sensor is one of the best results for resistor-type sensor for CO sensing at such high temperature.The mechanism for distinguishable response towards O2 and CO was discussed. These results indicate that electrospun CeO2 nanofibers are a promising nanomaterial for gas sensing in harsh environment.

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See more of this Session: Catalytic, Environmental and Industrial Gas Sensors
See more of this Group/Topical: Topical 9: Sensors