# Metal to insulator transition in Conducting Polyaniline/Graphene Oxide composites

## TL;DR

This study investigates the metal-insulator transition in Polyaniline/Graphene Oxide composites using broadband dielectric spectroscopy, revealing a transition around 75K influenced by temperature and annealing, with implications for electrical stability.

## Contribution

It provides new insights into the charge transfer mechanisms and the effects of annealing on the electrical properties of Polyaniline/Graphene Oxide composites.

## Key findings

- Metal-insulator transition occurs around 75K.
- Annealing enhances electrical stability of the composite.
- Charge transfer mechanisms are qualitatively described.

## Abstract

Broadband Dielectric Spectroscopy (BDS) measurements of P{\omicron}lyaniline/Graphene oxide composites were conducted for an as-prepared and a thermally annealed specimen, respectively, from 15K to room temperature. Electrical conductivity values of the annealed composite display a very modest rise denoting the important contributions of the GO component to achieving electrical stability of the polymer. Patterns of the dc conductivity as a function of temperature also reveal a metal to insulator transition around 75K. The transition is dominated by two key factors; temperature and annealing process. Metal-like and insulating features are subsequently detected, as well, and accordingly described to provide a qualitative inspection of the charge transfer mechanisms involved

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Source: https://tomesphere.com/paper/1903.07954