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|Title:||Hybrid composite materials of anatase titania and conducting polyaniline: properties and chemical sensor application|
Ramalakshmi, R Dhana
|Abstract:||This paper reports the investigation on synthesis, properties and chemical sensor application of polyaniline (PANI) - anatase titania (TiO<sub>2</sub>) hybrid composite materials prepared in the presence and absence of the soft template poly (vinyl alcohol) (PVA). FTIR spectroscopy reveals that PVA favors oxidation of large amount of aniline during PANI synthesis and causes production of more number of quinoid groups than benzenoid, but TiO<sub>2</sub> maintains an equal level of quinoid and benzenoid. XRD study shows that PVA influences the <i style="mso-bidi-font-style: normal">d</i>-space and crystallite size more in PANI-PVA and less in PANI-TiO<sub>2</sub>-PVA composite. In morphology, PANI-TiO<sub>2</sub> has submicron particles and shows less agglomeration while PANI-TiO<sub>2</sub>-PVA has extensive agglomeration and surface smoothness. In chemical sensor application, PANI senses CH<sub>3</sub>OH vapor with a decrease of its conductivity and with an efficiency of 56%. However, with the inclusion of TiO<sub>2 </sub>or<sub> </sub>PVA, the sensor efficiency of PANI is shifted from CH<sub>3</sub>OH to CH<sub>2</sub>Cl<sub>2</sub>. Interestingly with both TiO<sub>2</sub> and PVA inclusion, the material PANI-TiO<sub>2</sub>-PVA turns back its maximum sensor efficiency towards CH<sub>3</sub>OH but with an increase of its conductivity. All these results suggest that TiO<sub>2</sub>, PVA and TiO<sub>2</sub>-PVA exert different tuning roles on PANI yielding characteristically different hybrid materials.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.19(4) [August 2012]|
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