MoS2 makes gas and chemical sensors
The researchers demonstrated that the sensors, which they call molybdenum disulfide thin-film field-effect transistors (TF-FET), can selectively detect ethanol, acetonitrile, toluene, chloroform and methanol vapors.
Alexander Balandin, professor of electrical and computer engineering at UC Riverside, and the graduate students in his lab built the atomically thin gas and chemical vapor sensors from molybdenum disulfide and tested them in collaboration with researchers at the Rensselaer Polytechnic Institute in Troy, N.Y. The devices have two-dimensional channels, which are suited to sensor applications because of the high surface-to-volume ratio and widely tunable concentration of electrons.
Schematic of the Molybdenum disulfide (MoS2) thin-film sensor with the deposited molecules that create additional charge.
The findings were published in a recent paper, Selective chemical vapor sensing with few-layer MoS2 thin-film transistors: Comparison with graphene devices, in the journal Applied Physics Letters.
The UC Riverside built atomically thin gas sensors use low-frequency current fluctuations as additional sensing signal. In a separate paper, the same researchers demonstrated high temperature operation of the molybdenum disulfide atomically thin film transistors at temperatures in excess of 200 degrees C.
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