A Facile Route to Fabricate Stable Reduced Graphene Oxide Dispersions in Various Media and Their Transparent Conductive Thin Films
- A Facile Route to Fabricate Stable Reduced Graphene Oxide Dispersions in Various Media and Their Transparent Conductive Thin Films
- 민경호; 한태희; 김주훈; 정지영; 정철수; 홍순만; 구종민
- 그라핀; 전기전도막; 투명전극; Reduced graphene oxide (RGO); Solubility parameter; Zeta potential; Spray coating; Transparent electrode
- Issue Date
- Journal of colloid and interface science
- VOL 383, NO 1, 36-42
- In this paper, we demonstrate an easy way to prepare a stable reduced graphene oxide (RGO) dispersion
in aqueous or organic media by simple adjustment of the degree of reduction and pH of RGO dispersion,
and a subsequent fabrication of transparent conductive RGO thin films on various substrates using a
spray coating technique. RGOs were prepared using a hydrazine reducing agent from graphene oxide
(GO), which was oxidized from graphite via a modified Hummers’ method. The degree of reduction determined
the surface properties, such as atomic composition, surface polarity, and potential of RGO platelets.
In addition, pH significantly affected the surface potential of graphene dispersion. The fine
adjustment of degree of reduction and pH of RGO dispersion made production of fine RGO dispersions
in aqueous and organic media such as ethanol and DMF possible without any aid of dispersing agents.
The stable RGO dispersion using volatile ethanol medium provided a unique advantage to be spraycoated
into uniform transparent conductive RGO thin films on various substrates including silicon wafer,
flexible polycarbonate film regardless of their surface properties, and even on non-planar substrates such
as round-shaped glassware at room temperature.
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