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Abstract
Single-, double-, and triple-layered TiO2 nanotubes (NTs) array were synthesized by using a voltage pulse-assisted anodic oxidation technique. Morphological and structural evolution of different NTs have been studied by field-emission scanning electron microscopy and X-ray diffraction spectroscopy. “Au/TiO2 NT layer(s)/Ti” types vertical structured sensors were fabricated and characterized at room temperature (300 K) toward multiple volatile organic compounds (VOCs) and high sensitivity was observed at low concentration (40–160 ppm) of VOCs. Response magnitude was increased with increase of number of layer(s) and found maximum of ∼96% at 160 ppm of ethanol for triple-layered NTs. Efficient sensing was achieved for multi-layered TiO2 NTs due to the benefits of 1) incremental effective surface area and 2) Schottky barrier effect at interlayer junctions.
Published Version
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