Studies on Graphene Suspension and Self-assembled Graphene-based Membranes†

doi:10.7503/cjcu20150025

Abstract

Abstract:

Two kinds of surfactants, sodium dodecyl sulfate(SDS) and polyvinyl alcohol(PVA), were used to improve the dispersion of graphene in water. It was found that SDS can avoid the reunion between graphene layers, which makes the graphene evenly dispersed in the aqueous solution. Graphene(G) and Graphene flake films(GF) on the surface of ITO electrode were prepared via spin-coating with graphene dispersions. Scanning electron microscopy(SEM) and atomic force microscopy(AFM) results showed that the two types of graphene films represent a yarn shape of transparent flake structure. G/Ru and GF/Ru composite membranes were also prepared by molecular film self-assembly of the graphene films and Ru complex, which were characterized by cyclic voltammetry(CV) and ultraviolet-visible(UV-Vis) spectrometry. The results showed that the prepared composite films own high activity for the absorption of sunlight, indicating excellent photoelectric properties.

Key words: Graphene dispersion, Surfanctant, Graphene film, Composite film

CLC Number:

O646

TrendMD:

YANG Li, LI Kongzhai, WANG Hua, WEI Yonggang, ZHU Xing. Studies on Graphene Suspension and Self-assembled Graphene-based Membranes^†[J]. Chem. J. Chinese Universities, 2015, 36(6): 1166.

Figures/Tables 10

Fig.1 Structure of [Ru(Py2G1MeBip)(XPOH)](PF6)2 Ru complex(A) and surface-tethered structures for the Ru monolayer on graphene(B)

Fig.2 Effect of concentration of SDS on concen-trations of G(a) and GF(b)

Fig.3 Digital photos of G(A) and GF(B) suspensionsc(G)=0.39 mg/mL; c(GF)=0.30 mg/mL; c(SDS)=2.0 mg/mL.

Fig.4 SEM images of G(A) and GF(B) based membranes

Fig.5 AFM images of G(A) and GF(B) based membranes

Fig.6 Dependence of graphene coverage on rotation speeda. G; b. GF.

Fig.7 Dependence of surface coverage rate on time for graphenes on ITO surfacea. G; b. GF.

Fig.8 Contact angle photos of bare ITO(A), G film(B), GF film(C), G/Ru film(D) and GF/Ru film(E) For G/Ru and GF/Ru films, Ru is on the outermost of the film.

Fig.9 UV-Vis spectra of Ru monomolecular film(a), G/Ru film(b) and GF/Ru film(c)

Fig.10 Typical cyclic voltammograms of Ru, G, GF, G/Ru or GF/Ru film on an ITO substrate at a scan rate of 0.5 V/s(A) and dependence of the peak current on the scan rate(B) (A) a. Ru; b. G; c. GF; d. GF/Ru; e. G/Ru. (B) a, a'. GF/Ru film; b, b'. G/Ru film.

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