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Impedance variation with different relative humidities of PAni/Mn nanofibres

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Abstract

This paper presents the humidity sensing properties of surface-modified polyaniline (PAni). In this study, the impedance response and dielectric properties of pure- and doped-PAni have been investigated as a function of relative humidity (RH%) and frequency. PAni and PAni/Mn composite samples are synthesized by one-step interfacial polymerization process. The structural properties and surface morphologies of the prepared materials have been characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. XRD confirms the formation of PAni and it shows semi-crystalline behaviour. FESEM shows granular, porous and well-distributed structure. It has been observed that the porosity and nanogranular structure increased with increasing doping percentage. Here, we observe that porous and granular structure of Mn-doped PAni shows better response and recovery time (\({\sim }28\hbox { s}\)) and decreases in electrical impedance. Dielectric constants, dielectric loss and AC conductivity have also been discussed with variations in frequency and relative humidity.

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Acknowledgements

We are grateful to UP state government through the Centre of Excellence Scheme for providing XRD facility at the Department of Physics, University of Lucknow.

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  1. Department of Physics, University of Lucknow, Lucknow, 226007, India

    Divyanshi Srivastava & R K Shukla

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  1. Divyanshi Srivastava
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Correspondence to R K Shukla.

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Srivastava, D., Shukla, R.K. Impedance variation with different relative humidities of PAni/Mn nanofibres. Bull Mater Sci 43, 95 (2020). https://doi.org/10.1007/s12034-020-2063-2

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