Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 176, Issue -, Pages 475-481Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.07.081
Keywords
SnO2 porous nanosolid; Sensor response; Surface modification; Solvothermal hot-press
Funding
- Natural Science Foundation of China [NSFC 50990061, 51021062, 21073107, 51102151]
- Postdoctoral Science Foundation of China [20100481245]
- Natural Science Foundation [ZR2011EMQ002]
- Postdoctoral Innovation Foundation of Shandong Province [201003077]
- Independent Innovation Foundation [2010TS039]
- Postdoctoral Foundation of Shandong University
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The gas-sensing performance of SnO2 porous nanosolid (PNS) sensors was modulated via a surface modification strategy by calcining the sensors in different atmospheres. It was found that the response of SnO2 PNS 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 similar to 5.1 at 4.0 MPa and followed by a slight increase with the oxygen pressure further increasing. Contrarily, the SnO2 PNS 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. (C) 2012 Elsevier B.V. All rights reserved.
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