Journal
SENSOR LETTERS
Volume 11, Issue 2, Pages 423-427Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/sl.2013.2739
Keywords
NO2 Sensor; WO3 Nanoparticles; Microwave-Assisted Decomposition
Funding
- Natural Science Foundation of P. R. China [21001051, 61074172, 61134010]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT1017]
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WO3 nanoparticles were synthesized by calcinating the precursor, which was obtained via a microwave-assisted decomposition method. The as-prepared WO3 nanoparticles were characterized with field emission scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). The result revealed that the particle sizes were about 100 nm. Gas sensors based on as-prepared WO3 nanoparticles were fabricated, and their sensing performance were tested for response to ethanol, acetone, NO2, H2S, SO2, and NH3 gases. The gas-sensing mechanism was also briefly introduced. The sensor showed excellent selectivity and high sensitivity toward NO2 at relatively low operating temperature (70 degrees C). These results may provide a possible way for low concentration NO2 detection.
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