Abstract
Diphenyldiselenide (PhSe)2 was envisaged as a unique dopant for observing modulation in charge transport dynamics, impedance spectroscopy and temperature sensing behaviour of polythiophene (PTh). The [PTh/(PhSe)2] nanocomposite was synthesized via non-aqueous oxidative polymerization route in presence of ball milled diphenyldiselenide dopant. Thermogravimetric analysis, Fourier-transform infrared spectroscopy, powder X-ray diffraction and scanning transmission electron microscopy data were used to characterize synthesized material. (PhSe)2-doped PTh revealed interesting modulation of electrical properties in pristine polymer. While R–T measurement showed a negative temperature coefficient behaviour, dielectric depicted normal dispersion with changing frequency, impedance and modulus spectroscopy, inferred a series combination of parallel resistive-capacitive elements corresponding to the grain and grain boundary. The trap filled space charge limited conduction (SCLC) with three distinct regions of current variation was observed from I–V characteristics. The modulation in conducting pattern can be correlated with microstructure of nanocomposite, wherein PTh chains become compact due to structuring of (PhSe)2 dopant via π–π stacking interaction. Thus, charge carrier movement becomes higher along the compact PTh chains and it gets constricted at phase boundary. However, with increase of frequency and temperature, facile hop** occurs leading an increase of conductivity which is also evident from decrease of activation barrier with increasing frequency. Thus, incorporation of (PhSe)2 allows modulation in electrical properties of PTh, thereby making the material to form a parallel RC element dominated by the trap filled SCLC with NTC behaviour.
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The authors are grateful to Head, Department of Chemistry, University of Kashmir for encouragement.
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TJ: Performed laboratory bench work, data collection, raw data processing and presentation, MHN: Analysis and interpretation of the experimental data, provided infrastructural help and edited manuscript. MAR: Conceived the work, conceptualized and designed the experiments, analysed data and wrote the manuscript: SKM: helped with partial bench work, some data analysis and characterization, GMP: contributed infrastructural support, characterization data acquisition, analysis and manuscript proof reading.
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Jan, T., Moosvi, S.K., Najar, M.H. et al. Diphenyldiselenide modulated charge transport dynamics, impedance spectroscopy and temperature sensing behaviour of polythiophene. J Mater Sci: Mater Electron 33, 8179–8192 (2022). https://doi.org/10.1007/s10854-022-07969-5
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DOI: https://doi.org/10.1007/s10854-022-07969-5