Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 6, Pages 8013-8020Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.12.153
Keywords
Polymer composites; Metal oxide; X-ray diffraction; NO2 gas sensor; Selectivity
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Funding
- DAE-BRNS [2010/37P/45/BRNS/1442]
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Polypyrrole iron oxide (PPy/alpha-Fe2O3) hybrid nanocomposite sensor films were prepared by spin coating method on glass substrate and characterized for structural and morphological properties by means of X-ray diffraction (XRD), Fourier transform infra red (FTIR) spectroscopy and scanning electron microscopy (SEM), which proved the strong interaction between polypyrrole and alpha-Fe2O3 nanoparticles. The gas-sensing properties of the hybrid nanocomposites were studied and compared with those of PPy and alpha-Fe2O3. It was found that PPy/alpha-Fe2O3 hybrid nanocomposites can complement the drawbacks of pure PPy and alpha-Fe2O3 to some extent. It was revealed that PPy/alpha-Fe2O3 (50%) hybrid sensor operating at room temperature could detect NO2 at low concentration (10 ppm) with very high selectivity (18% compared to C2H5OH) and high sensitivity (56%), with better stability (85%). The sensing mechanism of PPy/alpha-Fe2O3 materials to NO2 was presumed to be the synergism of PPy and alpha-Fe2O3 or the effect of p-n heterojunctions. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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