Electrical transport study of potato starch-based electrolyte system |
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Authors: | Tuhina Tiwari Neelam Srivastava PC Srivastava |
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Institution: | (1) Physics Department, MMV, Banaras Hindu University, Varanasi, 221005, India;(2) Physics Department, Banaras Hindu University, Varanasi, 221005, India; |
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Abstract: | A biopolymer electrolyte system having conductivity ∼1.3 × 10−4 S cm−1 has been prepared using potato starch, NaI, glutaraldehyde and poly(ethylene glycol) (PEG; molecular weight = 300). High
ionic transference numbers (∼0.99) of the material confirmed its electrolytic behaviour. Conductivity and dielectric behaviour
as a function of frequency has been studied. Conductivity follows ‘universal power law’ (σ = σ
0 + Aω
n
) with exponent ‘n’ varying from 0.94 to 1.18. Cross-linking and plasticization increases long pathways motion of charge carriers, comparable
to sample dimension. Humidity-independent behaviour (up to 80% relative humidity), of impedance and water intake by the system,
indicates the system’s potentiality as a promising candidate for humidity immune device fabrication. The addition of PEG has
a twofold effect on the material’s conductivity. It not only increases conductivity but also improves the material’s immunity
towards humid atmosphere. |
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Keywords: | |
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