Xu, S;
Zhao, H;
Xu, Y;
Xu, R;
Lei, Y;
(2018)
Carrier Mobility-Dominated Gas Sensing: A Room-Temperature Gas-Sensing Mode for SnO₂ Nanorod Array Sensors.
ACS Applied Materials & Interfaces
, 10
(16)
pp. 13895-13902.
10.1021/acsami.8b03953.
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Abstract
Adsorption-induced change of carrier density is presently dominating inorganic semiconductor gas sensing, which is usually operated at a high temperature. Besides carrier density, other carrier characteristics might also play a critical role in gas sensing. Here, we show that carrier mobility can be an efficient parameter to dominate gas sensing, by which room-temperature gas sensing of inorganic semiconductors is realized via a carrier mobility-dominated gas-sensing (CMDGS) mode. To demonstrate CMDGS, we design and prepare a gas sensor based on a regular array of SnO2 nanorods on a bottom film. It is found that the key for determining the gas-sensing mode is adjusting the length of the arrayed nanorods. With the change in the nanorod length from 340 to 40 nm, the gas-sensing behavior changes from the conventional carrier-density mode to a complete carrier-mobility mode. Moreover, compared to the carrier density-dominating gas sensing, the proposed CMDGS mode enhances the sensor sensitivity. CMDGS proves to be an emerging gas-sensing mode for designing inorganic semiconductor gas sensors with high performances at room temperature.
| Type: | Article |
|---|---|
| Title: | Carrier Mobility-Dominated Gas Sensing: A Room-Temperature Gas-Sensing Mode for SnO₂ Nanorod Array Sensors |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsami.8b03953 |
| Publisher version: | https://doi.org/10.1021/acsami.8b03953 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gas-sensing modes, inorganic semiconductors, carrier mobility, room temperature, nanorod arrays |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10076158 |
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