TY - JOUR
T1 - Surface functionalization of porous In2O3 nanofibers with Zn nanoparticles for enhanced low-temperature NO2 sensing properties
AU - Chen, Kaixin
AU - Lu, Huan
AU - Li, Gang
AU - Zhang, Jinniu
AU - Tian, Yonghong
AU - Gao, Ying
AU - Guo, Quanmin
AU - Lu, Hongbing
AU - Gao, Jianzhi
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Different from the dominant method of surface modification of metal oxide sensing materials with noble metals, a simple and low-cost method is developed by using Zn nanoparticles as a surface modifier in this work. The first step involves the fabrication of porous In2O3 nanofibers by an electrospinning technique, and then Zn nanoparticles decorated In2O3 nanofibers are constructed by a simple thermal evaporation method. An increase in surface species absorbing capability and a decrease in sensor resistance are observed by surface modification of In2O3 nanofibers with Zn nanoparticles. In comparison with pure In2O3 nanofibers, this kind of Zn–In2O3 composite nanofibers display higher response and better selectivity to NO2. The response of Zn–In2O3 nanofibers is up to 130.00–5 ppm NO2 at 50 °C, which is 13.7 times higher than that of pure In2O3. From our perspective, the improved NO2 sensing performances of Zn–In2O3 composite nanofibers are mainly attributed to the enhanced resistance modulation because of the formation of ohmic contacts between Zn nanoparticles and In2O3 nanoparticles.
AB - Different from the dominant method of surface modification of metal oxide sensing materials with noble metals, a simple and low-cost method is developed by using Zn nanoparticles as a surface modifier in this work. The first step involves the fabrication of porous In2O3 nanofibers by an electrospinning technique, and then Zn nanoparticles decorated In2O3 nanofibers are constructed by a simple thermal evaporation method. An increase in surface species absorbing capability and a decrease in sensor resistance are observed by surface modification of In2O3 nanofibers with Zn nanoparticles. In comparison with pure In2O3 nanofibers, this kind of Zn–In2O3 composite nanofibers display higher response and better selectivity to NO2. The response of Zn–In2O3 nanofibers is up to 130.00–5 ppm NO2 at 50 °C, which is 13.7 times higher than that of pure In2O3. From our perspective, the improved NO2 sensing performances of Zn–In2O3 composite nanofibers are mainly attributed to the enhanced resistance modulation because of the formation of ohmic contacts between Zn nanoparticles and In2O3 nanoparticles.
KW - In2O3
KW - Zn
KW - gas sensor
KW - nanofibers
KW - surface functionalization
UR - http://www.scopus.com/inward/record.url?scp=85078559957&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2020.127716
DO - 10.1016/j.snb.2020.127716
M3 - Article
SN - 0925-4005
VL - 308
SP - 1
EP - 9
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
M1 - 127716
ER -