期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 23, 页码 26746-26754出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c07193
关键词
SnS2; layered materials; electrical contacts; Schottky barrier; gas sensor
资金
- National Key Research and Development Program [2017YFE0301404, 2017YFA0303800]
- National Natural Science Foundation of China [61874010]
- Science and Technology Innovation Program for Creative Talents in Beijing Institute of Technology [2017CX01006]
Layered materials are highly attractive in gas sensor research due to their extraordinary electronic and physicochemical properties. The development of cheaper and faster room-temperature detectors with high sensitivities especially in the parts per billion level is the main challenge in this rapidly developing field. Here, we show that sensitivity to NO2 (S) can be greatly improved by at least two orders of magnitude using an n-type electrode metal. Unconventionally for such devices, the In(S) follows the classic Langmuir isotherm model rather than S as is for a p-type electrode metal. Excellent device sensitivities, as high as 13,000% for 9 ppm and 97% for 1 ppb NO2, are achieved with Mn electrodes at room temperature, which can be further tuned and enhanced with the application of a bias. Long-term stability, fast recovery, and strong selectivity toward NO2 are also demonstrated. Such impressive features provide a real solution for designing a practical high-performance layered material-based gas sensor.
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