Journal
APPLIED PHYSICS LETTERS
Volume 113, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5063375
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Funding
- Virginia Microelectronics Consortium (VMEC) Research Grant
- National Key Research and Development Program of China [2017YFA02061042]
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Discriminating similar molecules remains a very challenging problem for semiconductor gas sensors. Here, we report a method to achieve precise gas discrimination of similar chemical vapors (mesitylene, o-xylene, and toluene) by using cross-reactive arrays consisting of metal oxide semiconductor and graphene sensors. It is difficult to identify these three chemicals as they have very similar responses to these sensors. Through cross-reactive Principal Component Analysis of the sensor response features, however, the discrimination accuracy improved from about 70% with a single gas sensor to almost 100% with the cross-reactive sensor array. Such a precise discrimination and the low-cost planar process make this approach a very attractive candidate for smart gas sensing and for future Internet of Things applications. Published by AIP Publishing.
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