Gas sensitivity of a composite of multi-walled carbon nanotubes and polypyrrole prepared by vapor phase polymerization

A composite of multi-walled carbon nanotubes (MWCNTs) and polypyrrole (Ppy) has been synthesized by vapor phase polymerization, and characterized by Fourier transformed infrared spectra, Raman spectra, thermal gravimetric analysis, X-ray diffraction study and scanning electron microscopy. Its gas se...

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Bibliographic Details
Published in:Carbon (New York) 2007-02, Vol.45 (2), p.357-363
Main Authors: Chen, You-si, Li, Yang, Wang, Hui-cai, Yang, Mu-jie
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Materials science
Physics
Specific materials
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Summary:A composite of multi-walled carbon nanotubes (MWCNTs) and polypyrrole (Ppy) has been synthesized by vapor phase polymerization, and characterized by Fourier transformed infrared spectra, Raman spectra, thermal gravimetric analysis, X-ray diffraction study and scanning electron microscopy. Its gas sensitive characteristics towards NH 3 vapor were investigated at room temperature. It was found that the composite exhibited a higher sensitivity than both Ppy and MWCNTs separately. In addition, the response was reversible even when the concentration of NH 3 vapor was as high as 12,500 ppm, in contrast to the usually observed unrecoverable response of carbon nanotubes and their composite to low concentration NH 3 vapor at room temperature. The oxidizing agents and dopants used for preparation of the composite have a great effect on its gas sensitive characteristics, which is related to its morphology and contact with the electrode.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2006.09.011