Israeli scientists enwickeln detectives chip
Researchers at the University of Tel Aviv in Israel have developed a chip that is able to, explosives such as trinitrotoluene TNT) trace (. According to scientists, the sensor chips are sniffer dogs and all other known methods for detecting explosives far superior to.
This "nano-detectives" remarkable TNT concentrations of one part per million ( 1 ppm ). They should not only help to thwart terrorist attacks, but also show contamination - such as former military sites.
The sensor is based on the principle of a nano- field effect transistor (nano-FET). Unlike a classic as a transistor it is connected by an electric field. Inside nanowires are made of silicon. This coat them with special silicon compounds, the amino groups on their part.
To these amino groups bind TNT molecules. Electrons move from the electron-rich amino groups on the electron-deficient TNT, resulting in the charge distribution changes abruptly at the surface of the nanowires and Daduchus their conductivity. This change can be easily measured, according to scientists.
Liquid and gaseous samples can be analyzed this way. Currently, the sensor is only able to detect TNT. Researchers around the chemist Fernando Patolsky working on a chip with large nano-sensor arrays to track the various explosives in parallel.
Your sensor featured in the magazine, the scientists applied chemistry before.
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