Enhanced Optical and Dielectric Properties of PANI/rGO Nanocomposites for Supercapacitor Application

Authors Ajay Kumar Sharma1,2, Praveen Kumar Jain3 , Rishi Vyas2 , Vishal Mathur4 , Vipin Kumar Jain1

1 Institute of Engineering and Technology, JK Lakshmipat University, Jaipur 302026, India

2 Department of Physics, Swami Keshvanand Institute of Technology, Management & Gramothan, Jaipur 302017, India

3 Department of Electronics and Communication Engineering, Swami Keshvanand Institute of Technology, Management & Gramothan, Jaipur 302017, India

4 Department of Engineering, Sur University College, Oman

Е-mail ajaymnit19@gmail.com
Issue Volume 11, Year 2019, Number 5
Dates Received 27 April 2019; revised manuscript received October 2019; published online 25 October 2019
Citation Ajay Kumar Sharma, Praveen Kumar Jain, Rishi Vyas, et al., J. Nano- Electron. Phys. 11 No 5, 05026 (2019)
DOI https://doi.org/10.21272/jnep.11(5).05026
PACS Number(s) 33.20.Lg, 61.46.-W, 77.22.-d.
Keywords Ultraviolet spectra, Structure of nanoscale materials, Dielectric properties of solids and liquids.

The conducting polymer nanocomposites have been extensively used due to manifold applications particularly as a novel supercapacitor material. The present work deals with the fabrication of PANI/rGO nanocomposites and investigating their morphological, optical and dielectric properties. The present paper is focused on the synthesis of (PANI)1-x(rGO)x nanocomposites (x = 0, 0.02, 0.04, 0.06, 0.08) prepared by an in-situ chemical oxidation polymerization of aniline using ammonium peroxide sulfate (APS) as an oxidant in presence of colloidal reduced graphene oxide (rGO) nanoparticles at 0-5 °C in air to improve optical and dielectric constants of PANI for supercapacitor applications. rGO was synthesized from graphite powder employing a modified Hummers method. The morphology of synthesized composite materials was studied by scanning electron microscopy (SEM). FTIR spectroscopy analysis of PANI/rGO nanocomposites was performed using Perkin Elmer FTIR spectroscopy. Dielectric properties of nanocomposites were studied using impedance analyzer and it is observed that incorporation of rGO in PANI improves the dielectric properties. UV-VIS-NIR spectrophotometer was used to study the absorption spectra of the composite samples. The band gap energy (Eg) of the nanocomposites was determined using Tauc’s relationship. It has been observed that the increasing the rGO concentration in composites reduces the optical band gap which attributes the enhancement in electron delocalization along the polymer chain. Also, the increment in protons with rGO concentration extends the density of states more into visible region of SEM spectra.

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