Ahn, M. -W. Park, K. -S. Heo, J. -H. Kim, D. -W. Choi, K. J. Park, J. -G. 2024-01-20T21:33:05Z 2024-01-20T21:33:05Z 2021-09-03 2009-04-24 0925-4005 https://pubs.kist.re.kr/handle/201004/132560 ZnO-nanowire gas sensors were fabricated by a selective growth of nanowires on patterned Au catalysts thus forming nanowire air bridges or 'nanobridges' between two Pt pillar electrodes. The gas sensing properties of nanobridge gas sensors were demonstrated using a diluted NO2. The response, as a function of temperature, was highest at 225 degrees C and was linearly increased with the concentration of NO2 in the range of 0.5-3 ppm and then showed a sign of saturation. Our sensor showed higher response compared with different types of sensors including ZnO nanocrystals, Sn- and In-doped ZnO thin film, or ZnO nanowires. The enhanced response was attributed to the additional modulation of the sensor resistance due to potential barrier at nanowire/nanowire junctions as well as the surface depletion region of each nanowire. Also nanobridge structure enabled fast recovery behavior because desorbed gas molecules can be easily swept away from the Surface of ZnO nanowire without re-adsorption. (C) 2009 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA ROOM-TEMPERATURE SENSING CHARACTERISTICS SNO2 NANOWIRES THIN-FILMS OXIDE NANOSENSORS NO2 POWDERS On-chip fabrication of ZnO-nanowire gas sensor with high gas sensitivity Article 10.1016/j.snb.2009.02.008 1 SENSORS AND ACTUATORS B-CHEMICAL, v.138, no.1, pp.168 - 173 SENSORS AND ACTUATORS B-CHEMICAL 138 1 168 173 scie scopus 000265656300027 2-s2.0-63749125435 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article ROOM-TEMPERATURE SENSING CHARACTERISTICS SNO2 NANOWIRES THIN-FILMS OXIDE NANOSENSORS NO2 POWDERS ZnO nanowire Gas sensor NO2 On-chip fabrication