Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 8, Issue 23, Pages 5006-5015Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1qi00930c
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Funding
- National Key Research and Development Project of China [2019YFA0705201]
- National Natural Science Foundation of China [52072093, 51802058]
- Applied Technology Research and Development Program of Heilongjiang Province [GY2018ZB0046]
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The two-dimensional layered metal dichalcogenides (LMDs) SnS2 is a promising candidate for high-performance NO2 gas sensors, but typically inert for detecting ppb-level NO2 at room temperature. Carbon (C)-doping of SnS2 significantly enhances the sensitivity towards ppb-level NO2, with a response as high as 1200% ppm(-1) and a low limit of detection (LOD) down to 0.3 ppb provide a real solution for developing high-performance LMDs-based gas sensors.
The two-dimensional layered metal dichalcogenides (LMDs) SnS2 is an interesting candidate for high-performance NO2 gas sensors. However, most SnS2-based NO2 sensors are usually inert for detecting ppb-level NO2 at room temperature (RT) because of the intrinsic features of a large bandgap, poor conductivity, and lack of active sites. Herein, we successfully endowed SnS2 with ppb-level NO2 detection at RT by using a carbon (C)-doping strategy. Compared to the pristine SnS2 showing a negligible response toward NO2 at RT, the C-doped SnS2 exhibited an excellent response (481.3% for 1 ppm and 146.5% for 100 ppb) with full recovery. The sensitivity toward ppb-level NO2 was as high as 1200% ppm(-1). Moreover, the experimental and theoretical limit of detection (LOD) were down to 10 ppb and 0.3 ppb, respectively. Such impressive gas-sensing performance of C-doped SnS2 at RT was due to the doping-mediated synergistic effect of energy-band modification and the presence of an S vacancy. The results provide a real solution for developing high-performance LMDs-based gas sensors.
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