Toshiba develops highly sensitive gas sensor to detect nerve gas
Toshiba has developed a highly sensitive gas sensor for detecting substances such as nerve gas. The transistor was made using the carbon material graphene, and gas molecules adsorbed on the graphene surface are detected through changes in electrical characteristics. The sensor can detect substances such as nerve gas at the level of tens of ppb. Toshiba aims to develop a portable gas sensor system that can be used for counter-terrorism and other purposes. In the new sensor, electrodes are affixed to a graphene sheet, so it can function as a field-effect transistor. To make the sensor, a single layer of graphene is formed on a copper substrate, and then the copper is dissolved in a chemical solution. Next, the graphene floating in the solution is placed onto a silicon substrate, and electrode connections are made, forming a transistor. To ensure that the sensor detects a particular gas, the recognition host molecules are arranged in a particular way, which enables gas molecule adsorption on the graphene surface.
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