Next Article in Journal
Prediction of the Fiber Orientation State and the Resulting Structural and Thermal Properties of Fiber Reinforced Additive Manufactured Composites Fabricated Using the Big Area Additive Manufacturing Process
Next Article in Special Issue
Development of Pb-Free Nanocomposite Solder Alloys
Previous Article in Journal
Low-Velocity Impact Properties of Sandwich Structures with Aluminum Foam Cores and CFRP Face Sheets
Previous Article in Special Issue
Preparation and Performance of Ecofriendly Epoxy/Multilayer Graphene Oxide Composites with Flame-Retardant Functional Groups
Article Menu

Export Article

Open AccessArticle
J. Compos. Sci. 2018, 2(2), 25; https://doi.org/10.3390/jcs2020025

Reduced Graphene Oxide: Effect of Reduction on Electrical Conductivity

1
Centre for Advanced Composite Materials, Department of Mechanical Engineering, The University of Auckland, Auckland Mail Centre, Auckland 1142, New Zealand
2
Areospace Research and Innovation Centre (ARIC), Khalifa University of Science, Technology and Research, P.O. Box, Abu Dhabi 127788, UAE
3
Department of Mechanical Engineering, Khalifa University of Science, Technology and Research, P.O. Box, Abu Dhabi 127788, UAE
*
Author to whom correspondence should be addressed.
Received: 5 March 2018 / Revised: 29 March 2018 / Accepted: 4 April 2018 / Published: 9 April 2018
Full-Text   |   PDF [7464 KB, uploaded 3 May 2018]   |  

Abstract

In this study, the effect of reduction on the electrical conductivity of Graphene Oxide (GO) is investigated. The aim of this fabrication was to render electromagnetic interference (EMI) shielding to thin polymer films using GO as fillers. The electrical conductivity was determined using the four-probe method and shielding effectiveness was theoretically determined using the experimentally obtained conductivity values. The initial oxidation of graphite was performed using Hummers’ method and the oxidized GO was dispersed in water for further exfoliation by ultrasonication. Thin films of sonicated GO dispersions were solution casted and dried in a convection oven at 50 °C overnight. The dried films were treated with 48% hydrobromic acid (HBr), 95% hydrochloric acid (HCl) or 66% hydroiodic acid (HI) for 2 h, 24 h or 48 h. A partial factorial design of experiments based on Taguchi method was used to identify the best reducing agent to obtain maximum electrical conductivity in the partially reduced GO films. The experimental analysis indicates that the electrical resistivity of GO is highly dependent on the type of acid treatment and the samples treated with HI acid exhibited lowest resistivity of ~0.003 Ω·cm. The drop in resistivity value after chemical reduction was of the order of 10,000 times, and range obtained in this work is among the lowest reported so far. The theoretical EMI shielding of the reduced GO film provided a shielding effectiveness of 5.06 dB at 12 GHz. View Full-Text
Keywords: graphene oxide; FTIR; EMI; Taguchi; electrical conductivity graphene oxide; FTIR; EMI; Taguchi; electrical conductivity
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Rao, S.; Upadhyay, J.; Polychronopoulou, K.; Umer, R.; Das, R. Reduced Graphene Oxide: Effect of Reduction on Electrical Conductivity. J. Compos. Sci. 2018, 2, 25.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
J. Compos. Sci. EISSN 2504-477X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top