Annamalai, Saravanan, Ramasamy, Radha Perumal. (1402). Chitosan – Graphite – Maghemite – a Flexible, Superparamagnetic Nanocomposite Comprising of Microcapacitors. هنرهای کاربردی, 3(1), 83-103. doi: 10.22075/ppam.2023.31598.1063
Saravanan Annamalai; Radha Perumal Ramasamy. "Chitosan – Graphite – Maghemite – a Flexible, Superparamagnetic Nanocomposite Comprising of Microcapacitors". هنرهای کاربردی, 3, 1, 1402, 83-103. doi: 10.22075/ppam.2023.31598.1063
Annamalai, Saravanan, Ramasamy, Radha Perumal. (1402). 'Chitosan – Graphite – Maghemite – a Flexible, Superparamagnetic Nanocomposite Comprising of Microcapacitors', هنرهای کاربردی, 3(1), pp. 83-103. doi: 10.22075/ppam.2023.31598.1063
Annamalai, Saravanan, Ramasamy, Radha Perumal. Chitosan – Graphite – Maghemite – a Flexible, Superparamagnetic Nanocomposite Comprising of Microcapacitors. هنرهای کاربردی, 1402; 3(1): 83-103. doi: 10.22075/ppam.2023.31598.1063

Chitosan – Graphite – Maghemite – a Flexible, Superparamagnetic Nanocomposite Comprising of Microcapacitors

Progress in Physics of Applied Materials
دوره 3، شماره 1 - شماره پیاپی 4، بهمن 2023، صفحه 83-103    اصل مقاله (1.08 M)
نوع مقاله: Original Article
شناسه دیجیتال (DOI): 10.22075/ppam.2023.31598.1063
نویسندگان
Saravanan Annamalai1؛ Radha Perumal Ramasamy* 2
1Department of Physics, Bharath Institute of Higher Education and Research, Chennai - 600 073
2Department of Physics Anna University, CEG Campus, Chennai - 600 025
چکیده
In this work, an eco-friendly “green” nanocomposite of chitosan containing graphite and maghemite (g-Fe2O3) nanoparticles were prepared by solution casting method. The effect of g-Fe2O3 nanoparticles on structural, electric and dielectric properties of Chitosan-graphite (Cs-graphite) composites was investigated. The dielectric constant of Cs-graphite composites increased with incorporation of g-Fe2O3 nanoparticles. Among the composites Cs-20% graphite - 20% g-Fe2O3 has dielectric constant of ~16.5 at 1 MHz at room temperature. With increase in temperature the dielectric constant varied significantly. The conductivity of Cs-graphite is enhanced by one order of magnitude with addition of g-Fe2O3 nanoparticles, and the value is found to be 5.7x10-6 S/cm. Various parameters such as dielectric constant, dielectric loss, electric modulus, conductivity, activation energy were analyzed. Magnetic measurement of g-Fe2O3 nanoparticles and the PNCs showed superparamagnetic behaviour. A model is proposed to explain the observed dielectric behavior of polymer nanocomposites (PNCs). The formation of microcapacitors by incorporation of maghemite nanoparticles between graphite is proposed.
کلیدواژه‌ها
Chitosan؛ graphite؛ maghemite nanoparticles؛ Superparamagnetism
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