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Chemical vapor detection using nonlinear electrical properties of carbon nanotube bundles

Gowda, Prarthana and Suri, Ashish and Reddy, Siva Kumar and Misra, Abha (2014) Chemical vapor detection using nonlinear electrical properties of carbon nanotube bundles. In: NANOTECHNOLOGY, 25 (2).

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Official URL: http://dx.doi.org/10.1088/0957-4484/25/2/025708


We demonstrate the electrical transport behavior of carbon nanotubes (CNTs) upon exposure to organic analytes (namely ethanol, benzene, acetone and toluene). The resulting nonlinear current-voltage characteristics revealed a power law dependence of the differential conductivity on the applied bias voltage. Moreover, suppression of differential conductivity at zero bias is found to be dependent on different selective analytes. The power law exponent values have been monitored before, during and after exposure to the chemicals, which revealed a reversible change in the number of electron conducting channels. Therefore, the reduction in the number of conductive paths can be attributed to the interaction of the chemical analyte on the CNT surfaces, which causes a decrease in the differential conductivity of the CNT sample. These results demonstrate chemical selectivity of CNTs due to varying electronic interaction with different chemical analytes.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the IOP PUBLISHING LTD, ENGLAND
Keywords: carbon nanotubes; differetial conducatnce; sensing; chemical vapor
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 12 Feb 2014 11:14
Last Modified: 12 Feb 2014 11:14
URI: http://eprints.iisc.ac.in/id/eprint/48363

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