标题：Improving the gas-sensing performance of SnO2porous nanosolid sensors by surface modification
作者：Luan, Chunhong ;Wang, Kang ;Yu, Qinqin ;Lian, Gang ;Zhang, Liangmin ;Wang, Qilong ;Cui, Deliang
作者机构：[Luan, Chunhong ;Yu, Qinqin ;Lian, Gang ;Cui, Deliang ] State Key Lab. of Crystal Materials, Shandong University, Jinan 250100, China;[Zhang, Liangmin 更多
来源：Sensors and Actuators, B: Chemical
摘要：The gas-sensing performance of SnO2porous nanosolid (PNS) sensors was modulated via a surface modification strategy by calcining the sensors in different atmospheres. It was found that the response of SnO2PNS sensors greatly improved (the maximum sensor response to 1000 ppm CO is 45.6) after being calcined in atmospheric-pressure nitrogen. However, the sensor response firstly decreased to a large extent after being calcined in 0.1-10 MPa oxygen, reaching a minimum value of ∼5.1 at 4.0 MPa and followed by a slight increase with the oxygen pressure further increasing. Contrarily, the SnO2PNS sensors exhibited monotonically deteriorating gas-sensing performance after being calcined in nitrogen of ever-increasing pressure. The mechanism related to the above phenomena was preliminarily explained by using the corresponding Hall effect and XPS measurement results. © 2012 Elsevier B.V. All rights reserved.