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Novel self-heated gas sensors using on-chip networked nanowires with ultralow power consumption
(International Training Institute for Materials Science, Hanoi University of Science and Technology)
(International Training Institute for Materials Science, Hanoi University of Science and Technology)
(International Training Institute for Materials Science, Hanoi University of Science and Technology)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. (Mikrosystemteknik)
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2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 7, p. 6153-6162Article in journal (Refereed) Published
Abstract [en]

The length of single crystalline nanowires (NWs) offers aperfect pathway for electron transfer, while the small diameter of the NWshampers thermal losses to tje environment, substrate, and metal electrodes.Therefore, Joule self-heating effect is nearly ideal for operating NW gassensors at ultralow power consumption, without additional heaters. Therealization of the self-heated NW sensors using the “pick and place”approach is complex, hardly reproducible, low yield, and not applicable formass production. Here, we present the sensing capability of the self-heatednetworked SnO2 NWs effectively prepared by on-chip growth. Ourdeveloped self-heated sensors exhibit a good response of 25.6 to 2.5 ppmNO2 gas, while the response to 500 ppm H2, 100 ppm NH3, 100 ppm H2S,and 500 ppm C2H5OH is very low, indicating the good selectivity of thesensors to NO2 gas. Furthermore, the detection limit is very low, down to 82parts-per-trillion. As-obtained sensing performance under self-heating modeis nearly identical to that under external heating mode. While the power consumption under self-heating mode is extremely low,around hundreds of icrowatts, as scaled-down the size of the electrode is below 10 μm. The selectivity of the sensors can becontrolled simply by tuning the loading power that enables simple detection of NO2 in mixed gases. Remarkable performancetogether with a significantly facile fabrication process of the present sensors enhances the potential application of NW sensors innext generation technologies such as electronic noses, the Internet of Things, and smartphone sensing.

Place, publisher, year, edition, pages
2017. Vol. 9, no 7, p. 6153-6162
Keywords [en]
self-heating, networked nanowires, low power sensors, NO2 gas, SnO2 nanowires
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-320586DOI: 10.1021/acsami.6b14516OAI: oai:DiVA.org:uu-320586DiVA, id: diva2:1090054
Available from: 2017-04-21 Created: 2017-04-21 Last updated: 2017-04-21

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