Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 204, Issue -, Pages 351-359Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.07.076
Keywords
Nanowire-like network; Sensor array; Principal component analysis; Materials-sensor integration fabrication strategy
Funding
- National Basic Research Program of China [2009CB939702, 2009CB939705]
- Nature Science Foundation of China [50927201, 51204072]
- Open Foundation of the State Key Laboratory of Silicate Materials for Architectures at Wuhan University of Technology [SYSJJ2013-06]
- Analytic Testing Center of HUST
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As inspired by a novel materials-sensor integration fabrication strategy, nanowire-like network (NWN) structured ZnO, Co3O4, In2O3 and SnO2 films are synthesized directly onto an alumina substrate by the screen printing combined with micro-injecting and calcination (SPMIC) to fabricate a flat-type coplanar gas sensor array based on these four sensors. The gas-sensing properties of the sensor array are investigated at different operating temperatures (150-350 degrees C), and the best selectivity is interestingly found among the four indoor pollution gases including toluene (C7H8), formaldehyde (HCHO), acetone (CH3COCH3) and ammonia (NH3) at 300 degrees C. This is also confirmed by the principal component analysis (PCA) result that the four gases can be discriminated and recognized by the sensor array. The enhancement in the selectivity is attributed to the combination of special nanostructures with large surface area and sensor array based on the four different metal oxides. Furthermore, the SPMIC method is demonstrated to be an effective route not only to synthesize NWN structured metal oxides directly onto an alumina substrate without being destroyed, but also to fabricate coplanar sensor array based on various NWN structured metal oxide films. (C) 2014 Elsevier B.V. All rights reserved.
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