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Tuning the electronic and magnetic properties of PEDOT-PSS-coated graphene oxide nanocomposites for biomedical applications

Published online by Cambridge University Press:  14 September 2020

Elison S. Ganya ,
Sabata J. Moloi ,
Sekhar C. Ray Open the ORCID record for Sekhar C. Ray [Opens in a new window]  and
Way-Faung Pong
Elison S. Ganya
Affiliation:
Department of Physics, College of Science, Engineering and Technology (CSET), University of South Africa, 1710Johannesburg, South Africa
Sabata J. Moloi
Affiliation:
Department of Physics, College of Science, Engineering and Technology (CSET), University of South Africa, 1710Johannesburg, South Africa
Sekhar C. Ray*
Affiliation:
Department of Physics, College of Science, Engineering and Technology (CSET), University of South Africa, 1710Johannesburg, South Africa
Way-Faung Pong*
Affiliation:
Department of Physics, Tamkang University, Taipei251301, Taiwan
*
a)Address all correspondence to these authors. e-mail: raysc@unisa.ac.za
b)e-mail: wfpong@mail.tku.edu.tw
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Abstract

We have synthesized graphene oxide (GO) using Hummer's method which was subsequently reduced (rGO) by hydrazine hydrate. The synthesized GO was coated with poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) conducting polymer (CP) to obtain CP-GO which was also further reduced using hydrazine hydrate to form CP-rGO. Scanning electron microscopy, Raman spectroscopy, X-ray diffraction, ultraviolet photoelectron spectroscopy, and X-ray photoelectron spectroscopy, X-ray absorption near-edge structure (XANES) techniques were used to study the electronic and structural properties of GO, rGO, CP-GO, and CP-rGO nanocomposites for biomedical applications. The superconducting quantum interference device method was used to investigate the magnetic properties of the nanocomposites. The electrical conductivity of the CP-GO nanocomposites was found to be ~104 times higher than that of GO due to an increase in sp2 content and subsequent decrease in oxygen functional groups. In rGO, we observed an improved paramagnetic saturation magnetization of approximately 5.6 × 0−3 emu/g at 2 K. The electronic and magnetic behavior of PEDOT-PSS-coated nanocomposites, as a result, were successfully tuned for potential biological and biomedical applications.

Keywords

PEDOT-PSS-coated graphene oxideRamanXANESXPSmagnetization

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Journal of Materials Research , Volume 35 , Issue 18 , 28 September 2020 , pp. 2478 - 2490
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Copyright © Materials Research Society 2020

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