Nano Science and Technology Institute
Nanotech 2012 Vol. 1
Nanotech 2012 Vol. 1
Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Chapter 2: Graphene

Dispersion of chemically-modified graphene and its applications

Authors:J.T. Han, S.H. Kim, J.S. Kim, S.Y. Jeong, H.J. Jeong, G-W Lee
Affilation:Korea Electrotechnology Research Institute, KR
Pages:157 - 160
Keywords:chemically-modified graphene, dispersion, conductivity
Abstract:In this study, we present straightforward methods to produce large-area GO sheets with fewer defects on the basal plane and for addressing the problems associated with dispersing reduced GO nanosheets in organic solvents for applications. First, the large and less defective GO nanosheets were successfully produced by inducing shear stress in solution using a homogenizer. The shear-induced exfoliation process for preparing GO significantly influenced rGO formation, not only by introducing fewer structural defects on the basal plane but also by producing large-area rGO sheets with high qulity. The enhanced sheet resistance of the rGO thin film was found to be 2.2 kohm/sq at 80% transmittance. Second, a stable dispersion of rGO sheets in an organic solvent was achieved as a result of hydrophobic interactions between sp2 carbons in rGO surfaces and acac stabilizer ligands in the TiO2 precursor sol. Moreover, the conductivity of the rGO multilayer films was therefore enhanced, and the carrier mobility could be controlled by varying the quantity of TiO2 sol in the precursor solution.
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