3D MoS2 Aerogel for Ultrasensitive NO2 Detection and Its Tunable Sensing Behavior
- Univ. of California, Berkeley, CA (United States); Huazhong Univ. of Science and Technology, Wuhan (China)
- Univ. of California, Berkeley, CA (United States)
- Huazhong Univ. of Science and Technology, Wuhan (China)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
A high-performance NO2 sensor based on the 3D MoS2 aerogel is introduced. Compared to single- or few-layer MoS2, 3D assemblies of 2D MoS2 provide more surface area per footprint with a simple and scalable synthesis. Integration of the 3D MoS2 aerogel on a low-power microheater platform is demonstrated, and the sensing behavior of the 3D MoS2 aerogel is investigated. A two-step sulfurization treatment is developed to obtain a high-quality MoS2 aerogel with strong sensing performance. The aerogel exhibits low detection limit (50 ppb) toward NO2 at room temperature, while after the two-step sulfurization treatment, it also exhibits fast response and recovery at low heater temperature of 200 °C, with no decrease in sensitivity. The observed p-type sensing behavior of MoS2 aerogel is discussed and identified as being controlled by the defect state (as probed by the S:Mo ratio). Furthermore, annealing in a hydrogen environment changes the defect state of the MoS2 aerogel by creating more sulfur vacancies; concomitantly, a transition from p-type sensing behavior to n-type sensing is observed
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
- Grant/Contract Number:
- AC52-07NA27344; AC02‐05CH11231; FA9550‐14‐1‐0323; AC02-05CH11231; KC2207
- OSTI ID:
- 1548333
- Alternate ID(s):
- OSTI ID: 1376745
- Report Number(s):
- LLNL-JRNL-769872; 960996
- Journal Information:
- Advanced Materials Interfaces, Vol. 4, Issue 16; ISSN 2196-7350
- Publisher:
- Wiley-VCHCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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