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Open AccessArticle

Impedance Spectroscopy Analysis and Equivalent Circuit Modeling of Graphene Oxide Solutions

1
Department of Materials Engineering, Korea Aerospace University, Goyang 10540, Korea
2
School of Electronics and Information Engineering, Korea Aerospace University, Goyang 10540, Korea
3
Department of Electrical Engineering, KAIST, Daejeon 34141, Korea
*
Authors to whom correspondence should be addressed.
Nanomaterials 2017, 7(12), 446; https://doi.org/10.3390/nano7120446
Received: 11 October 2017 / Revised: 2 December 2017 / Accepted: 9 December 2017 / Published: 14 December 2017
The optical and electrical characteristics of a graphene oxide solution (GS) with different graphene oxide (GO) concentrations in de-ionized water are investigated via the electrochemical impedance spectroscopy (EIS) method. The measurement results produced by the EIS for the GS are represented with both Bode and Nyquist plots in a frequency range from 1 kHz to 10 MHz. Using these results, we develop an equivalent circuit model as a function of the GO concentration, representing the GS as a mixed circuit of two-dimensional (2D) GO dispersed in parallel in de-ionized (DI) water. The underlying physics of the current-flowing behavior in the GS are explained and interpreted using empirical circuit models; the circuit model also shows that highly resistive GO becomes conductive in GS form in the DI water. The findings in this work should draw new attention toward GSes and related applications, including functional composite materials, catalysts, and filter membranes. View Full-Text
Keywords: graphene oxide solution; impedance spectroscopy analysis; equivalent circuit model graphene oxide solution; impedance spectroscopy analysis; equivalent circuit model
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MDPI and ACS Style

Yoon, Y.; Jo, J.; Kim, S.; Lee, I.G.; Cho, B.J.; Shin, M.; Hwang, W.S. Impedance Spectroscopy Analysis and Equivalent Circuit Modeling of Graphene Oxide Solutions. Nanomaterials 2017, 7, 446.

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