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One-dimensional variable range charge carrier hopping in polyaniline–tungsten oxide nanocomposite-based hydrazine chemiresistor

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Abstract

Low-temperature direct current charge transport mechanism of charge carriers in polyaniline–tungsten oxide (PAN-WO3) nanocomposite has been investigated. Charge transport in pristine PAN was found to govern by Mott’s three-dimensional variable range hopping (3-D VRH) model. However, the inclusion of WO3 in nanocomposite shifts the dimension of hopping from 3-D to 1-D. The room-temperature conductivity of PAN-WO3 nanocomposite (5.55 × 10–3 S/cm) was also found to be enhanced compared to pristine PAN (1.27 × 10–5 S/cm). The reasons for crossover in hopping dimensionality and enhanced conductivity of PAN-WO3 nanocomposite have been explained in terms of Mott’s parameters, i.e., small hopping radius, lower hopping energy, high inter-chain distance, and prominent intra-chain transport. Furthermore, PAN-WO3 exhibited enhanced reversible sensing behaviour (27%) towards 10 parts per million of hydrazine at room temperature compared to that of pristine PAN (12%). Enhanced sensing characteristics of PAN-WO3 nanocomposite can be attributed to its higher conductivity and prominent intra-chain unidirectional charge transport. Present communication opens a new window for energy-saving, eco-friendly, cost-effective, recoverable and reproducible, easily processable and efficient PAN-WO3 nanocomposite-based hydrazine detecting device.

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Acknowledgements

Author wish to acknowledge Department of Science and Technology, Government of India and Vice chancellor, university of Delhi, Delhi, India for financial assistance.

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  1. Research Cell and Department of Physics, Bhagini Nivedita College, University of Delhi, Delhi, 110007, India

    Vishal Chaudhary

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  1. Vishal Chaudhary
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Chaudhary, V. One-dimensional variable range charge carrier hopping in polyaniline–tungsten oxide nanocomposite-based hydrazine chemiresistor. Appl. Phys. A 127, 536 (2021). https://doi.org/10.1007/s00339-021-04690-8

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