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Sensing behavior of atomically thin-layered MoS2 transistors. (a) Schematic of the MoS2 transistor-based NO2 gas-sensing device. (b) Optical photograph of the MoS2 sensing device mounted on the chip. Comparative two- and five-layer MoS2 cyclic sensing performances with NH3. (c) and NO2 (for 100, 200, 500, 1000 ppm) (d). Reprinted with permission from Ref. [78]. Copyright 2013 ACS.
