An enrichment method to detect low concentration formaldehyde

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 SnO 2 sensor was much higher than that of an undoped SnO 2 sensor. In order to detect...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2008-09, Vol.134 (2), p.1010-1015
Main Authors: Wang, Jing, Liu, Li, Cong, Song-Ying, Qi, Jin-Qing, Xu, Bao-Kun
Format: Article
Language:English
Subjects:
Actuators
Enrichment
Formaldehyde
Gas sensor
Low concentrations
MWCNTs
Semiconductors
Sensors
SnO 2
Tin dioxide
Tin oxides
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Summary: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 SnO 2 sensor was much higher than that of an undoped SnO 2 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 SnO 2 sensor was 0.03 ppm.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2008.07.010