TY - JOUR
T1 - Performance Improvement of Nitrogen Oxide Gas Sensors Using Au Catalytic Metal on SnO2/WO3 Complex Nanoparticle Sensing Layer
AU - Lee, Ching Ting
AU - Lee, Hsin Ying
AU - Chiu, Ying Shuo
N1 - Funding Information:
This work was supported in part by the Ministry of Science and Technology, Taiwan, under Grant MOST 104-2221-E-006-002, Grant MOST 103-2221-E-006-002, and Grant NSC-102-2221-E-006-269 and in part by the Advanced Optoelectronic Technology Center and the Research Center Energy Technology and Strategy, National Cheng Kung University.
PY - 2016/11/1
Y1 - 2016/11/1
N2 - In this paper, to improve the sensing performances, the layers of SnO2/WO3 complex nanoparticles, instead of pure SnO2 or WO3, were applied for sensing nitrogen oxide (NO) gas. In general, the SnO2 and WO3 nanoparticles provide a large sensing area and, respectively, possess well sensing capability for NO and NO2 gases. Because NO gas is prone to be transformed into NO2 gas in the environment, the gas sensors with SnO2:WO3 (1:0.25) complex nanoparticle sensing layer exhibited better NO sensing response compared with the gas sensors with pure SnO2 nanoparticle sensing layer. Furthermore, by performing an annealing process at 500 °C and then depositing a gold (Au) catalytic metal layer on the annealed SnO2/WO3 complex nanoparticles, the resulting NO gas sensors exhibited the sensing response of 10.61 under the NO gas concentration of 1 ppm. Moreover, the lowest detection limit of the NO gas sensors with Au covered SnO2:WO3 (1:0.25) complex nanoparticle sensing layer was also extended from 200 to 150 ppb compared with the ones without Au catalytic metal.
AB - In this paper, to improve the sensing performances, the layers of SnO2/WO3 complex nanoparticles, instead of pure SnO2 or WO3, were applied for sensing nitrogen oxide (NO) gas. In general, the SnO2 and WO3 nanoparticles provide a large sensing area and, respectively, possess well sensing capability for NO and NO2 gases. Because NO gas is prone to be transformed into NO2 gas in the environment, the gas sensors with SnO2:WO3 (1:0.25) complex nanoparticle sensing layer exhibited better NO sensing response compared with the gas sensors with pure SnO2 nanoparticle sensing layer. Furthermore, by performing an annealing process at 500 °C and then depositing a gold (Au) catalytic metal layer on the annealed SnO2/WO3 complex nanoparticles, the resulting NO gas sensors exhibited the sensing response of 10.61 under the NO gas concentration of 1 ppm. Moreover, the lowest detection limit of the NO gas sensors with Au covered SnO2:WO3 (1:0.25) complex nanoparticle sensing layer was also extended from 200 to 150 ppb compared with the ones without Au catalytic metal.
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U2 - 10.1109/JSEN.2016.2598349
DO - 10.1109/JSEN.2016.2598349
M3 - Article
AN - SCOPUS:84991510663
VL - 16
SP - 7581
EP - 7585
JO - IEEE Sensors Journal
JF - IEEE Sensors Journal
SN - 1530-437X
IS - 21
M1 - 7534877
ER -