Title of article
Highly sensitive NO2 sensor based on square-like tungsten oxide prepared with hydrothermal treatment
Author/Authors
You، نويسنده , , L. and Sun، نويسنده , , Y.F. and Ma، نويسنده , , J. and Guan، نويسنده , , Y. and Sun، نويسنده , , J.M. and Du، نويسنده , , Y. and Lu، نويسنده , , G.Y.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2011
Pages
7
From page
401
To page
407
Abstract
The square-like WO3 nanosheets were synthesized by hydrothermal treatment of irregular WO3 nanosheets prepared through acidification of Na2WO4·2H2O. The obtained square-like and irregular WO3 nanosheets were characterized with field emission scanning electron microscopy, X-ray powder diffraction and transmission electron microscopy. The gas sensing properties of sensors based on as-prepared samples were investigated. The results indicated that both samples exhibited high response to NO2. The sensor based on square-like WO3 nanosheets exhibited remarkably enhanced response and faster response/recovery time for NO2 compared with that based on irregular nanosheets. Especially, the sensor based on square-like WO3 nanosheets could detect NO2 down to 40 ppb, which covered environmental standard. A possible reason for the influence of unique structure on the sensing properties of sensors based on square-like WO3 was proposed.
Keywords
NO2 sensor , hydrothermal treatment , tungsten oxide , Nanosheets
Journal title
Sensors and Actuators B: Chemical
Serial Year
2011
Journal title
Sensors and Actuators B: Chemical
Record number
1439673
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