TY - JOUR
T1 - Schottky-type response of carbon nanotube NO 2 gas sensor fabricated onto aluminum electrodes by dielectrophoresis
AU - Suehiro, Junya
AU - Imakiire, Hiroshi
AU - Hidaka, Shin Ichiro
AU - Ding, Weidong
AU - Zhou, Guangbin
AU - Imasaka, Kiminobu
AU - Hara, Masanori
N1 - Funding Information:
This work was partly supported by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (No. 16360207).
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2006/4/26
Y1 - 2006/4/26
N2 - Single-walled carbon nanotube (CNT) gas sensors were fabricated by dielectrophoresis onto microelectrodes made of Cr, Pd or Al. The Al/CNT sensor response to NO 2 (nitrogen dioxide) gas was characterized by fast and large resistance increase at the moment of NO 2 exposure, whereas the resistance of the other metal/CNT sensors monotonously decreased. It was suggested that the adsorbed NO 2 molecules might alter the Schottky barrier at the Al/CNT interface as well as the positive hole density in the p-type semiconducting CNT. The Al/CNT sensor response could be interpreted as a superposition of the Schottky contact resistance and the CNT resistance, which were differently influenced by the NO 2 adsorption and contributed to the overall sensor response. The Schottky response of the Al/CNT sensor was approximately one order of magnitude faster than the CNT response obtained using the other metal electrodes.
AB - Single-walled carbon nanotube (CNT) gas sensors were fabricated by dielectrophoresis onto microelectrodes made of Cr, Pd or Al. The Al/CNT sensor response to NO 2 (nitrogen dioxide) gas was characterized by fast and large resistance increase at the moment of NO 2 exposure, whereas the resistance of the other metal/CNT sensors monotonously decreased. It was suggested that the adsorbed NO 2 molecules might alter the Schottky barrier at the Al/CNT interface as well as the positive hole density in the p-type semiconducting CNT. The Al/CNT sensor response could be interpreted as a superposition of the Schottky contact resistance and the CNT resistance, which were differently influenced by the NO 2 adsorption and contributed to the overall sensor response. The Schottky response of the Al/CNT sensor was approximately one order of magnitude faster than the CNT response obtained using the other metal electrodes.
UR - http://www.scopus.com/inward/record.url?scp=33645140595&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33645140595&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2005.08.043
DO - 10.1016/j.snb.2005.08.043
M3 - Article
AN - SCOPUS:33645140595
SN - 0925-4005
VL - 114
SP - 943
EP - 949
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
IS - 2
ER -