Effects of various surfactants on the dispersion stability and electrical conductivity of surface modified graphene
- Effects of various surfactants on the dispersion stability and electrical conductivity of surface modified graphene
- Md. Elias Uddin; Tapas Kuila; Ganesh Chandra Nayak; 김남훈; 구본철; 이중희
- Surface modification; Water dispersibility; UV-vis spectroscopy; X-ray photoelectron spectroscopy; Electrical conductivity
- Issue Date
- Journal of alloys and compounds
- VOL 562, 134-142
- Ionic and non-ionic surfactant functionalized, water dispersible graphene were prepared to investigate
the effects on the dispersion stability and electrical conductivity of graphene. In this study, sodium dodecyl
benzene sulfonate (SDBS), sodium dodecyl sulfate and 4-(1,1,3,3-tetramethylbutyl) phenyl-polyethylene
glycol (Triton X-100) were used as ionic and non-ionic surfactants. The effects of surfactant
concentrations on the dispersibility and electrical conductivity of the surface modified graphene were
investigated. The dispersion stability of SDBS functionalized graphene (SDBS-G) was found to be best
in water at 1.5 mg ml-1. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy
analysis indicate that the presence of surfactants does not prevent the reduction of graphene oxide
(GO). These measurements also demonstrated that the surfactants were present on the surface of graphene,
resulting in the formation of functionalized graphene. The thickness of different functionalized
graphene was measured by Atomic force microscopy and varied significantly with different surfactants.
The thermal properties of the functionalized graphene were also found to be dependent on the nature of
the surfactants. The electrical conductivity of SDBS-G (108 S m-1) was comparatively higher than SDS and
Triton X-100 functionalized graphene.
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