Abstract
Gas sensing properties at room temperature and energy harvesting performances are realized for the polyvinylidene fluoride (PVDF) nanocomposites containing titanium dioxide (TiO2) nanotubes grown in the presence of carbon nanotubes (CNT). While hydrothermal reaction is practiced for the development of TiO2/CNT hybrid nanotubes, spin coating is done for the nanocomposite films to be deposited on sensing electrodes. Influence of various filler concentrations and the synergistic combination of fillers on the sensing characteristics are studied by recording the response times and the stability of the results. Upon exposure to liquefied petroleum gas, the PVDF/TiO2-CNT (2.5 wt.%) gas sensor shows a sensing response of 0.45 s (400 ppm LPG), approximately nine times higher than the composite containing 2.5 wt.% of TiO2 or 2.5 wt.% CNT. The piezoelectric response of the samples is also recorded and correlated with the synergistic influence of the filler materials. The current study can stimulate a good trend in fabricating self-powered gas sensors from PVDF nanocomposites.
Highlights
Advancement of flexible and conductive polymer nanocomposites requires the presence of a highly conducting network arranged through electrically conducting filler units.[1]
The coated samples on the sensing electrodes are shown in the figure. Such electrodes with coated samples were used for the liquefied petroleum gas (LPG) and solvent vapor sensing experiments
This paper describes the fabrication of PVDFbased composite films containing carbon nanotubes (CNT)-TiO2 hybrid nanotube architecture for their effective application in LPG sensing
Summary
Advancement of flexible and conductive polymer nanocomposites requires the presence of a highly conducting network arranged through electrically conducting filler units.[1]. This mainly happens when the concentration of the nanomaterials becomes well above the percolation threshold.[11]
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