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Nanoarchitecture of PANI/CNT/GO hybrid nanocomposites with enhanced dielectric and gas sensing properties

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Abstract

The polyaniline (PANI) and PANI/carbon nanotubes (CNT)/graphene oxide (GO) thin film were prepared in indium tin oxide coated glass plate by spin coating method. The molecular structure and physical properties of PANI and its hybrid nanocomposites were characterized by UV–Vis spectra, field emission scanning electron microscope (FE-SEM) and atomic force microscopy (AFM). UV–Vis spectra show the agreement with formation of π–π* electron interaction between PANI and CNT/GO. This interaction causes the decrease of bandgap due to confinement of the electrons and holes. The FE-SEM and AFM image of hybrid nanocomposites is different than PANI due to globular morphologies in the presence of CNT and GO. The surface free energy of PANI and hybrid nanocomposites thin films was analyzed by measuring contact angles. The dielectric permittivity and tangential loss (tan δ) of hybrid nanocomposites with different frequency were investigated at room temperature. The incorporation of CNT and GO in PANI matrix possesses high dielectric constant, low dielectric loss and high energy density. The excellent C3H6O gas sensing performance of PANI/CNT/GO hybrid nanocomposites thin film may be attributed to more oxygen vacancies and narrower bandgap. The response of PANI/CNT/GO sensor was four times better than PANI sensor with the recovery time of 506 s.

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Acknowledgements

We gratefully acknowledge the financial support of Indo–Belarus joint project (Project no. DST/INT/BLR/P-13/2016) by Department of Science and Technology (DST), New Delhi (India). One of the authors Rohan Sagar acknowledge the University Grant Commission (UGC), New Delhi (India), for a providing research fellowship (Award number RGNF-2017-18-SC-UTT-29088).

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  1. Department of Physics, Hindustan College of Science and Technology (Affiliated to Dr. A.P.J. Abdul Kalama Technical University, Lucknow, U.P. 226031, India), Farah, Mathura, Uttar Pradesh, 281122, India

    Rohan Sagar & M. S. Gaur

  2. Francisk Skorina Gomel State University, Sovetskaya, Str. 104, 246019, Gomel, Republic of Belarus

    A. A. Rogachev

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  1. Rohan Sagar
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Sagar, R., Gaur, M.S. & Rogachev, A.A. Nanoarchitecture of PANI/CNT/GO hybrid nanocomposites with enhanced dielectric and gas sensing properties. Polym. Bull. 80, 1773–1793 (2023). https://doi.org/10.1007/s00289-022-04127-z

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