SiOCN Functionalized Carbon Nanotube Gas Sensors for Elevated Temperature Applications

Year: 2015

Authors: Karakuscu A., Hu L.H., Ponzoni A., Baratto C., Ceccato R., Sberveglieri G., Raj R.

Autors Affiliation: Department of Information Engineering CNR IDASC and University of Brescia SENSOR Lab, Brescia, Italy;
Department of Mechanical Engineering, University of Colorado,Boulder, CO 80309 USA
Department of Industrial Engineering, University of Trento, Italy

Abstract: Silicon Oxycarbonitride (SiOCN) functionalization is proposed for stable, reproducible, reliable, and enhanced gas-sensing properties in carbon nanotube (CNT) gas sensors. The process is very simple: liquid precursor completely coats the surfaces of the CNTs without requiring any surface modification and a thin layer of semiconductor ceramic SiOCN is created on the CNTs after heat treatment. This new kind of conductometric gas sensors can detect 10ppm NH3 and 2ppm NO2 at temperatures up to 350 degrees C. The stability of the functionalized CNT sensor is verified up to 520 degrees C, while the CNT sensor without the SiOCN coating lost conductance after 250 degrees C due to the structural modification. SiOCN functionalization of CNT changes the recovery from irreversible to reversible and the recovery time decreases from 60min at 100 degrees C to 19min at 350 degrees C.

Journal/Review: JOURNAL OF THE AMERICAN CERAMIC SOCIETY

Volume: 98 (4)      Pages from: 1142  to: 1149

More Information: The work has been supported by the Dual PhD program between University of Trento, Italy and University of Colorado Boulder, U.S.A. This work is supported by the Ceramics Program in the Division of Materials Research at the National Science Foundation under grant no: 0907108. Authors thank Dr. John Axel Down for editing.
KeyWords: ELECTRICAL-PROPERTIES; SODIUM-BOROHYDRIDE; CROSS-SENSITIVITY; CERAMICS; NANOCOMPOSITES; HYDROGEN; FILMS; NO2
DOI: 10.1111/jace.13396

Citations: 14
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