Journal
SENSORS
Volume 18, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/s18040999
Keywords
indium oxide; flexible substrates; gas sensors; nitrogen dioxide
Funding
- MINECO [BES-2016-076582]
- FEDER [TEC2015-71663-R]
- AGAUR [2017SGR 418]
- Catalan institution for Research and Advanced Studies via 2012 Edition of the ICREA Academia Award
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Indium oxide octahedral nanopowders were obtained from an ionic precursor compound after an oxidation process conducted under a low-oxygen atmosphere. This method was found to produce contamination-free indium oxide nanomaterial with very similar morphological and crystalline properties to the one produced by vapor-phase transport, but at significantly lower temperatures and higher yield. The as-synthesized indium oxide was mixed to an organic vehicle and microdrop deposited to form a film bridging the interdigitated silver electrodes patterned on top of a flexible, polyimide (Kapton (R)), substrate. The gas sensing properties of the flexible chemoresistors towards ammonia vapors, hydrogen, and nitrogen dioxide were investigated. It was found that these sensors were remarkably sensitive to nitrogen dioxide at a low operating temperature of 150 degrees C. These results are consistent with the performance of vapor-phase transport synthesized indium oxide octahedra sensors on rigid, ceramic substrates. Therefore, the results presented here pave the way for the mass production of inexpensive gas sensors onto flexible substrates via additive manufacturing.
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