Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 134, Issue 2, Pages 1010-1015Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.07.010
Keywords
Gas sensor; Formaldehyde; Enrichment; SnO2; MWCNTs
Funding
- National Natural Science Foundation of China [60474052]
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A semiconductor gas sensor of tin oxide doped with hydroxyl (OH) functionalized multi-wall carbon nanotubes (MWCNTs) was fabricated for detecting indoor formaldehyde concentration. The response of the MWCNTs-doped SnO2 sensor was much higher than that of an undoped SnO2 sensor. In order to detect low concentration formaldehyde, a novel enrichment method utilizing active carbon was applied. The response of the sensor was obviously increased by the application of the enrichment method. The lowest concentration of formaldehyde gas detected by a 5 wt% MWCNTs-doped SnO2 sensor was 0.03 ppm. (C) 2008 Elsevier B.V. All rights reserved.
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