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Hierarchical PANI/MWCNT Nanocomposite: Synthesis, Characterization and Gas Sensing Properties

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Author(s): XIAO Yuan-Hua, TANG Xin-Cun, WANG Zhi-Min, LI Feng, CHEN Gu-Chun, LI Lian-Xing, ZHANG Liang

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 10;
Start page: 1092;
Date: 2010;
Original page

Keywords: PANI/MWCNT | gas sensing | hierarchical | needle-like | ammonia

ABSTRACT
Hierarchical polyaniline/multiwalled carbon nanotube (MWCNT) nanocables was synthesized by in-situ chemical polymerization directed by cationic surfactant cetyltrimethylammonium bromide (CTAB). Morphological and structural characteristics, gas-sensing properties, as well as thermal stability of the hybrid nanocomposites were characterized by using various techniques, including Fourier transform infrared spectroscope (FT-IR), UV-Visible absorption spectrum(UV-Vis), scanning electron microscope (SEM), transmission electronmicroscope (TEM), thermogravimetric analyzer and gas-sensing measurement. The results indicate that the as-prepared PANI/MWCNT is uniform with 20nm thick needle-like PANI shell. The sensors based on PANI/MWCNT nanocomposites and pure PANI are tested for ammonia gas. Compared with the reported PANI/MWCNT without needle-like PANI, the as-prepared PANI/MWCNT nanocomposites sensors have higher sensitivity and repeatability, and better response/reproducibility towards ammonia at room temperature and also exhibits the higher sensitivity.
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