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Efficient room temperature methanol sensors based on polyaniline/graphene micro/nanocomposites

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A Correction to this article was published on 21 May 2020

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Abstract

The chemically prepared pristine and graphene-doped polyaniline (PANI) samples are utilized for the fabrication of room temperature methanol sensors. For the fabrication of PANI/graphene-based sensing devices, four samples of PANI/graphene composites were prepared with four different concentrations of graphene (2, 4, 6 and 8 wt%). The surface morphology of the prepared composites was analyzed under field emission scanning electron microscopy (FE-SEM), which revealed the agglomerated structures of PANI/graphene composites. X-Ray diffraction studies carried out on these samples revealed the semi-crystalline nature of the samples, whereas, Raman studies confirmed the growth of PANI with the presence of all fundamental bands of PANI in the pristine as well as in its doped state. The prepared PANI/graphene composites devices were tested for alcohol detection at two different concentrations (50 and 100 ppm) of methanol. The change in electric current with the change in environment has been recorded as a sensing parameter and is employed to determine other sensor parameters such as percentage response, response time and recovery time. The sensing response of the prepared samples is found to increase with graphene doping concentration as well as methanol ppm level. The PANI/graphene composite with 8 wt% doping of graphene has shown the highest response (~ 61.5% at 100 ppm) and the lowest response time (55 s). The mechanism of gas sensing has also been discussed in details with the possible theoretical analogy with the adsorption and desorption of gas molecules in accordance with Langmuir kinetic theory.

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Change history

  • 21 May 2020

    The article listed above was initially published with typo error in Eq. (4).

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Acknowledgements

Authors are thankful for financial assistance from DST-FIST for providing XRD facility. Authors are also grateful to UGC-DAE CSR, Indore for providing the FESEM and Raman facilities for the present work.

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Authors and Affiliations

  1. Department of Physics, Guru Jambheshwar University of Science and Technology, Hisar, Haryana, 125001, India

    Rishi Pal & Sneh Lata Goyal

  2. Department of Physics, Kirori Mal College, University of Delhi, Delhi, 110007, India

    Ishpal Rawal

  3. Department of Physics, Government College for Women, Sec-14, Gurugram, Haryana, 122001, India

    Smriti Sharma

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  1. Rishi Pal
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Correspondence to Sneh Lata Goyal.

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Pal, R., Goyal, S.L., Rawal, I. et al. Efficient room temperature methanol sensors based on polyaniline/graphene micro/nanocomposites. Iran Polym J 29, 591–603 (2020). https://doi.org/10.1007/s13726-020-00822-8

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  • DOI: https://doi.org/10.1007/s13726-020-00822-8

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