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Sub-fonds 01: Australian Red Cross Society, New South Wales Division, branch records, 1914-2014

Graphene, a truly two-dimensional and fully
π
-conjugated honeycomb carbon network, is currently evolving into the most promising successor to silicon in micro- and nanoelectronic applications. However, its wider application is impeded by the difficulties in opening a bandgap in its gapless band-structure, as well as the lack of processability in the resultant intrinscially insoluble material. Covalent chemical modification of the
π
-electron system is capable of addressing both of these issues through the introduction of variable chemical decoration. Although there has been significant research activity in the field of functionalized graphene, most work to date has focused on the use of graphene oxide. In this Article, we report on the first wet chemical bulk functionalization route beginning with pristine graphite that does not require initial oxidative damage of the graphene basal planes. Through effective reductive activation, covalent functionalization of the charged graphene is achieved by organic diazonium salts. Functionalization was observed spectroscopically, and successfully prevents reaggregation while providing solubility in common organic media.
Efforts to make graphene more useful for applications include altering its bandgap and increasing its processability. Both of these can be solved by chemically modifying the material, and now a wet chemical method has been developed that functionalizes graphene in bulk starting from pristine graphite.

Nature chemistry, 2011-04, Vol.3 (4), p.279-286

Covalent bulk functionalization of graphene

An efficient route to synthesize macroscopic amounts of graphene is highly desired and bulk characterization of such samples, in terms of the number of layers, is equally important. We present a Raman spectroscopy-based method to determine the typical upper limit of the number of graphene layers in chemically exfoliated graphene. We utilize a controlled vapour-phase potassium intercalation technique and identify a lightly doped stage, where the Raman modes of undoped and doped few-layer graphene flakes coexist. The spectra can be unambiguously distinguished from alkali doped graphite, and modeling with the typical upper limit of the layers yields an upper limit of flake thickness of five layers with a significant single-layer graphene content. Complementary statistical AFM measurements on individual few-layer graphene flakes find a consistent distribution of the layer numbers.

Scientific reports, 2019-12, Vol.9 (1), p.19480-10, Article 19480

Characterizing the maximum number of layers in chemically exfoliated graphene

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Sub-fonds 01: Australian Red Cross Society, New South Wales Division, branch records, 1914-2014

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Covalent bulk functionalization of graphene

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Characterizing the maximum number of layers in chemically exfoliated graphene

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