Boron- and nitrogen-doped multi-wall carbon nanotubes for gas detection

Adjizian, Jean-Joseph and Leghrib, Radouane and Koos, Antal A. and Suarez-Martinez, Irene and Crossley, Alison and Wagner, Philipp and Grobert, Nicole and Llobet, Eduard and Ewels, Christopher P. (2014) Boron- and nitrogen-doped multi-wall carbon nanotubes for gas detection. Carbon, 66. pp. 662-673. ISSN 0008-6223

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The response of pristine, nitrogen and boron doped carbon nanotube (CNT) sensors to NO2, CO, C2H4 and H2O at ppm concentrations was investigated at both room temperature and 150 °C. N-doped CNTs show the best sensitivity to nitrogen dioxide and carbon monoxide, while B-doped CNTs show the best sensitivity to ethylene. All tubes (including undoped) show strong humidity response. Sensing mechanisms are determined via comparison with density functional calculations of gas molecule absorption onto representative defect structures in N and B-doped graphene. N-CNTs show decreased sensitivity with temperature, and detection appears to occur via gas physisorption. B-CNTs appear to react chemically with many of the absorbed species as shown by their poor baseline recovery and increasing sensitivity with temperature. This limits their cyclability. Overall gas sensitivity is as good or better than post-growth functionalised nanotubes, and used in combination, CNTs, N-CNTs and B-CNTs appear highly promising candidates for cheap, low power, room temperature gas sensing applications.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika > QC06 Physics of condensed matter / szilárdtestfizika
Depositing User: Dr Antal A Koós
Date Deposited: 19 Sep 2015 06:44
Last Modified: 19 Sep 2015 06:44

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