Journal
ADVANCED MATERIALS INTERFACES
Volume 4, Issue 16, Pages -Publisher
WILEY
DOI: 10.1002/admi.201700217
Keywords
low power; microheaters; MoS2 aerogel; NO2 detection; p-type sensing behavior
Funding
- Berkeley Sensor and Actuator Center (BSAC)
- National Science Foundation (NSF) [IIP 1444950]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy [DE-AC02-05CH11231, KC2207]
- Air Force Office of Scientific Research [FA9550-14-1-0323]
- Lawrence Livermore National Laboratory under U.S. Department of Energy, through LDRD [DE-AC52-07NA27344, 13-LW-099]
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A high-performance NO2 sensor based on the 3D MoS2 aerogel is presented. 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 degrees C, with no decrease in sensitivity. The observed p-type sensing behavior of MoS2 aerogel is investigated and identified as being controlled by the defect state (as probed by the S:Mo ratio). It is demonstrated that 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.
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