SnO2 monolayer porous hollow spheres as a gas sensor.
The authors report on gas sensing properties of SnO2 hollow spheres with diverse microstructures, which are synthesized through controlled precipitation of Sn(OH)4 layers on carbon sphere templates, followed by heat treatment at different temperatures. Hollow spheres derived at 973 K consist of monolayer SnO2 grains, which lead to a huge activated surface area. The sensitivity of sensors based on SnO2 monolayer hollow spheres is up to 51 at 100 ppm ethanol, which is much higher than that of two other samples. We attribute this enhancement mostly to the enhanced depletion effect arising from the increased exposed surface. Our results suggest a direction for improving the performance of gas sensors by using monolayer porous hollow spheres.
Yin
Xiao Ming
XM
Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, and State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, Peolpe's Republic of China.
Li
Cheng Chao
CC
Zhang
Ming
M
Hao
Quan Yi
QY
Liu
Shuang
S
Li
Qiu Hong
QH
Chen
Li Bao
LB
Wang
Tai Hong
TH
D015374:Biosensing Techniques / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D054118:Nanospheres / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D017971:Tin Compounds / Q000737:chemistry*
D017971:Tin Compounds; C045358:stannic oxide