Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 91, Issue 4, Pages 707-710Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-008-4517-z
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By using a thermal chemical vapor deposition and Au-catalyzed in situ alignment and growth process, SnO2 nanowires could be bridged across trenched electrodes. In this process, a complicated and individual alignment process could be avoided and a number of devices can be fabricated in one step in a wafer scale. The gas-sensing characteristics of the developed sensor were significantly better when compared to those of other types of NO2 sensors reported in the literature. When the concentration of NO2 was 5 ppm, the sensitivity was higher than 150. Especially, the reaction time of 8-14 s was noticeably fast, which is attributed to the microtrench structure beneath the nanowires.
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