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Thin sensors boast high-level gas, chemical detection

Posted: 25 Feb 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Graphene? Molybdenum disulphide? sensors?

The uniqueness of the UC Riverside built atomically thin gas sensors!both graphene and MoS2!is in the use of the low-frequency current fluctuations as additional sensing signal. Conventionally such chemical sensors use only the change in the electrical current through the device or a change in the resistance of the device active channel.

In a separate paper, the same researchers demonstrated high temperature operation of the molybdenum disulphide atomically thin film transistors. The work was described in the paper, "High-temperature performance of MoS2 thin-film transistors: Direct current and pulse current-voltage characteristics," that was recently published in the Journal of Applied Physics.

Many electronic components for control systems and sensors are required to operate at temperature above 200<C. Examples of the high temperature applications include turbine engine control in aerospace and energy generation and oil field instruments.

The availability of transistors and circuits to operate at temperatures above 200<C is limited. Devices made of silicon carbide and gallium nitride!conventional semiconductors!hold promise for extended high-temperature operation but are still not cost-effective for high volume applications. There is a need for new material systems that can be used to make field-effect transistors sensors that work at high temperatures.

The work at UC Riverside was supported by the Semiconductor Research Corporation (SRC) and Defence Advanced Research Project Agency (DARPA) through STARnet Centre for Function Accelerated nanomaterial Engineering (FAME).

- Sean Nealon
??UCR Today

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