Abstract
Abstract In the present work, we report on the performance of a room temperature (300 K) liquefied petroleum gas (LPG) sensor based on a p-polyaniline/n-TiO 2 heterojunction. The heterojunction was fabricated using electrochemically deposited polyaniline on chemically deposited TiO 2 on a stainless steel substrate. Both the methods (chemical bath deposition and electrodeposition) are simple, inexpensive and suitable for large-scale production. TiO 2 and polyaniline films were characterized for their structural as well as surface morphologies and LPG response was studied. The XRD analysis showed formation of polycrystalline TiO 2 while polyaniline exhibited amorphous nature. Morphological analysis using scanning electron microscopy (SEM) of the junction cross-section revealed formation of a diffusion free interface. The heterojunction showed the maximum response of 63% upon exposure to 0.1 vol% LPG at room temperature.
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