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Alexander G. Bannov, Ondřej Jašek, Anton Manakhov, Marian Márik, David Nečas, Lenka Zajíčková

High performance ammonia gas sensors based on plasma treated carbon nanostructures

IEEE Sensors J. 17 (2017) 1964-1970

Sensors based on multi-walled carbon nanotubes (MWCNTs) were functionalized by oxygen plasma treatment and plasma co-polymerization of maleic anhydride and acetylene, obtaining core-shell carbon nanopartices covered by functional groups. The active nanostructured carbonaceous material was investigated by scanning electron microscopy, energy dispersive X-ray spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. It was confirmed that plasma treatment increases the content of surface functional groups. The sensing properties of the functionalized material were measured in the range of 10-1000 ppm of NH3 at room temperature. The plasma treated sensor showed an extremely high response of 22.5 %, 27.9 % and 31.4 % to 100 ppm, 250 ppm and 500 ppm of NH3, respectively. It was shown that the nature of NH3 adsorption on the functionalized nanostructured carbon material is physical adsorption.

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DOI: 10.1109/JSEN.2017.2656122

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