Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

TOWARDS GAS SENSING WITH VERTICALLY ALIGNED CARBON NANOTUBES INTERROGATED BY THz RADIATION PULSES
Wissem Zouaghi^a, Laith Hussein^b, Mark D. Thomson^a, Qamar-ul Islam^a, Norbert Nicoloso^c, Thorsten Heinlein^b, Jörg Engstler^b, Jörg J. Schneider^b, and Hartmut G. Roskos^a
^aPhysikalisches Institut, Goethe-Universität, D-60438 Frankfurt am Main, Germany
^bFachbereich Chemie, Eduard-Zintl-Institut, Fachgebiet Anorganische Chemie, Technische Universität Darmstadt, D-64287 Darmstadt, Germany
^cFachbereich Material- und Geowissenschaften, Fachgebiet Disperse Feststoffe, Technische Universität Darmstadt, Germany
E-mail: roskos@physik.uni-frankfurt.de

Received 1 February 2018; accepted 22 March 2018

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.

Keywords: carbon nanotubes, terahertz spectroscopy, conductivity changes, gas sensing
PACS: 78.67.Ch, 73.63.Fg, 85.35.Kt, 07.07.Df, 34.35.+a

DUJŲ APTIKIMO GALIMYBĖS NAUDOJANT TERAHERCINIAIS IMPULSAIS ŠVITINAMUS VERTIKALIAI ORIENTUOTUS ANGLIES NANOVAMZDELIUS
Wissem Zouaghi^a, Laith Hussein^b, Mark D. Thomson^a, Qamar-ul Islam^a, Norbert Nicoloso^b, Thorsten Heinlein^b, Jörg Engstler^b, Jörg J. Schneider^b, Hartmut G. Roskos^a

^aGėtės universitetas, Frankfurtas prie Maino, Vokietija
^bDarmštato technikos universitetas, Darmštatas, Vokietija

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