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Towards gas sensing with vertically aligned carbon nanotubes interrogated by THz radiation pulses

Zouaghi, Wissem and Hussein, Laith and Thomson, Mark D. and Islam, Qamar-ul and Nicoloso, Norbert and Heinlein, Thorsten and Engstler, Jörg and Schneider, Jörg J. and Roskos, Hartmut G. (2018):
Towards gas sensing with vertically aligned carbon nanotubes interrogated by THz radiation pulses.
58, In: Lithuanian Journal of Physics, (1), pp. 38-48, ISSN 1648-8504, DOI: 10.3952/physics.v58i1.3650,
[Online-Edition: https://doi.org/10.3952/physics.v58i1.3650],
[Article]

Abstract

When vertically aligned carbon nanotubes (VACNT) are exposed to gases, their dielectric properties may change by mechanisms such as doping effects or a modification of the scattering channels of the mobile charge carriers of the VACNT. This report provides first data of a study which aims at an exploration of such conductivity changes in the THz frequency regime. The test gases are NH3 and SO2 which are known to act as donors, respectively as acceptors when interacting with the carbon nanotubes. Our measurements confirm the doping effects. This may open the way towards gas sensors based on the VACNT interrogated by THz radiation, where the VACNTs act as an accumulation volume for certain species contained in a gas stream.

Item Type: Article
Erschienen: 2018
Creators: Zouaghi, Wissem and Hussein, Laith and Thomson, Mark D. and Islam, Qamar-ul and Nicoloso, Norbert and Heinlein, Thorsten and Engstler, Jörg and Schneider, Jörg J. and Roskos, Hartmut G.
Title: Towards gas sensing with vertically aligned carbon nanotubes interrogated by THz radiation pulses
Language: German
Abstract:

When vertically aligned carbon nanotubes (VACNT) are exposed to gases, their dielectric properties may change by mechanisms such as doping effects or a modification of the scattering channels of the mobile charge carriers of the VACNT. This report provides first data of a study which aims at an exploration of such conductivity changes in the THz frequency regime. The test gases are NH3 and SO2 which are known to act as donors, respectively as acceptors when interacting with the carbon nanotubes. Our measurements confirm the doping effects. This may open the way towards gas sensors based on the VACNT interrogated by THz radiation, where the VACNTs act as an accumulation volume for certain species contained in a gas stream.

Journal or Publication Title: Lithuanian Journal of Physics
Volume: 58
Number: 1
Uncontrolled Keywords: carbon nanotubes, terahertz spectroscopy, conductivity changes, gas sensing
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 07 Jun 2018 08:21
DOI: 10.3952/physics.v58i1.3650
Official URL: https://doi.org/10.3952/physics.v58i1.3650
Funders: This work was funded by the Hessian Excellence Initiative LOEWE, Project “Sensors Towards THz”.
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