TY - JOUR
T1 - Effect of mixing ratio on NO2 gas sensor response with SnO2-decorated carbon nanotube channels fabricated by one-step dielectrophoretic assembly
AU - Inaba, Masafumi
AU - Oda, Takenori
AU - Kono, Masaki
AU - Phansiri, Nisarut
AU - Morita, Takahiro
AU - Nakahara, Shota
AU - Nakano, Michihiko
AU - Suehiro, Junya
N1 - Funding Information:
This study was supported by the Japan Society for the Promotion of Science KAKENHI (Grant Numbers JP20H02164 and JP20K14777 ). Mark Kurban from Edanz Group ( https://www.jp.edanz.com/ac ) edited a draft of this manuscript.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/10/1
Y1 - 2021/10/1
N2 - We fabricated nitrogen dioxide (NO2) gas sensors with p-type carbon nanotubes (CNTs) / n-type tin dioxide (SnO2) nanoparticle heterojunctions using one-step dielectrophoretic assembly and investigated the effect of CNT/SnO2 ratio on their NO2 gas detection properties. CNTs and SnO2 nanoparticles were mixed in various ratios, suspended in deionized water, and assembled by dielectrophoresis. The normalized response of fabricated CNT/SnO2 heterojunction gas sensors against 1 ppm NO2 was ∼80 in an N2 atmosphere and ∼20 in artificial air, where UV irradiation was used only for initialization. To reduce the effect of oxygen (O2), we also conducted continuous UV irradiation with various intensities during the initialization and gas detection. The CNT/SnO2 pn heterojunction gas sensor had a maximum normalized response of 19 for 1 ppm NO2 in artificial air, while that of the SnO2 sensor was 3. Furthermore, plotting the gas sensor response as a function of NO2 concentration reveals that the sensor detected an NO2 gas concentration as low as 20 ppb in artificial air.
AB - We fabricated nitrogen dioxide (NO2) gas sensors with p-type carbon nanotubes (CNTs) / n-type tin dioxide (SnO2) nanoparticle heterojunctions using one-step dielectrophoretic assembly and investigated the effect of CNT/SnO2 ratio on their NO2 gas detection properties. CNTs and SnO2 nanoparticles were mixed in various ratios, suspended in deionized water, and assembled by dielectrophoresis. The normalized response of fabricated CNT/SnO2 heterojunction gas sensors against 1 ppm NO2 was ∼80 in an N2 atmosphere and ∼20 in artificial air, where UV irradiation was used only for initialization. To reduce the effect of oxygen (O2), we also conducted continuous UV irradiation with various intensities during the initialization and gas detection. The CNT/SnO2 pn heterojunction gas sensor had a maximum normalized response of 19 for 1 ppm NO2 in artificial air, while that of the SnO2 sensor was 3. Furthermore, plotting the gas sensor response as a function of NO2 concentration reveals that the sensor detected an NO2 gas concentration as low as 20 ppb in artificial air.
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U2 - 10.1016/j.snb.2021.130257
DO - 10.1016/j.snb.2021.130257
M3 - Article
AN - SCOPUS:85109389212
SN - 0925-4005
VL - 344
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
M1 - 130257
ER -