Banerjee_manuscript_R2 (1).pdf (1.89 MB)
Download fileCharge transport through functionalized graphene quantum dots embedded in a polyaniline matrix
journal contribution
posted on 2021-03-11, 11:28 authored by Abu Bakar Siddique, Kelly MorrisonKelly Morrison, Guru Venkat, Ashit Kumar Pramanick, Niladri Banerjee, Mallar RayNitrogen-functionalized graphene quantum dots
embedded in a polyaniline matrix (NGQD−PANI) are extremely
promising candidates for the development of next-generation
sensors and for thermoelectric materials design with the distinct
advantage of tunability of electronic properties by controlled
doping and/or by controlling the inherent disorder in the
microstructure. While their application is increasing in photovoltaics, energy storage, and sensing technologies, a clear
understanding of conduction in these hybrid systems is lacking.
Here, we report a comprehensive study of NGQD−PANI
composites with varying NGQD doping levels over a wide range
of temperature. We show distinct regimes of conduction as a function of temperature, which include: a transition from Efros−
Shklovskii and Larkin−Khmelnitskii variable range hopping at low temperatures to thermally driven electron transport at higher
temperatures. Importantly, we find a remarkable 50-fold enhancement in conductivity for 10% NGQD-doped samples and tunability
of the crossover temperature between different regimes as a function of the applied voltage bias and doping. Our work provides a
general framework to understand the interplay of extrinsic parameters like temperature and voltage bias with intrinsic material
properties like doping, which drives the electronic properties in these hybrid systems of technological importance.
Funding
Spin-Orbit Coupling-Driven Superconducting Spintronics
Engineering and Physical Sciences Research Council
Find out more...History
School
- Science
Department
- Physics
Published in
ACS Applied Electronic MaterialsVolume
3Issue
3Pages
1437-1446Publisher
American Chemical Society (ACS)Version
- AM (Accepted Manuscript)
Rights holder
© American Chemical SocietyPublisher statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Electronic Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsaelm.1c00057Acceptance date
2021-02-23Publication date
2021-03-04Copyright date
2021ISSN
2637-6113eISSN
2637-6113Publisher version
Language
- en