TY - JOUR
T1 - Methylbenzene sensors using Ti-doped NiO multiroom spheres
T2 - Versatile tunability on selectivity, response, sensitivity, and detection limit
AU - Kim, Ki Beom
AU - Jeong, Seong Yong
AU - Kim, Tae Hyung
AU - Kang, Yun Chan
AU - Lee, Jong Heun
N1 - Funding Information:
This work was supported by a grant from the Samsung Research Funding & Incubation Center for Future Technology (SRFC), Grant No. SRFC-TA1803-04.
Funding Information:
This work was supported by a grant from the Samsung Research Funding & Incubation Center for Future Technology (SRFC) , Grant No. SRFC-TA1803-04 .
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Pure and Ti-doped NiO multiroom spheres were prepared via ultrasonic spray pyrolysis, and their gas sensing characteristics were investigated. The sensor using 10 at% Ti-doped NiO multiroom spheres exhibited an unprecedented high response (resistance ratio = 337.8) to 1 ppm p-xylene at 350 ℃, whereas the sensor using pure NiO multiroom spheres exhibited a negligibly low response (1.3). Moreover, the control of the Ti doping and film thickness provided intriguing strategies for tuning the xylene and methylbenzene sensing characteristics, such as the selectivity, response, sensitivity (slope between response and gas concentration), and detection limit. The versatile tunability on gas sensing characteristics was explained by the Ti-doping-induced variation of the oxygen adsorption, mesoporosity, specific surface area, and charge-carrier concentration, as well as the control over the reforming and oxidation of the analyte gases using the multiroom-structured micro-reactors with high catalytic activity.
AB - Pure and Ti-doped NiO multiroom spheres were prepared via ultrasonic spray pyrolysis, and their gas sensing characteristics were investigated. The sensor using 10 at% Ti-doped NiO multiroom spheres exhibited an unprecedented high response (resistance ratio = 337.8) to 1 ppm p-xylene at 350 ℃, whereas the sensor using pure NiO multiroom spheres exhibited a negligibly low response (1.3). Moreover, the control of the Ti doping and film thickness provided intriguing strategies for tuning the xylene and methylbenzene sensing characteristics, such as the selectivity, response, sensitivity (slope between response and gas concentration), and detection limit. The versatile tunability on gas sensing characteristics was explained by the Ti-doping-induced variation of the oxygen adsorption, mesoporosity, specific surface area, and charge-carrier concentration, as well as the control over the reforming and oxidation of the analyte gases using the multiroom-structured micro-reactors with high catalytic activity.
KW - Aromatic volatile organic compounds
KW - Gas sensor
KW - Methylbenzene
KW - Oxide semiconductor
KW - Tenability
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U2 - 10.1016/j.snb.2020.127730
DO - 10.1016/j.snb.2020.127730
M3 - Article
AN - SCOPUS:85078217618
VL - 308
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
M1 - 127730
ER -