Carbon-based nanomaterials have attracted significant attention due to their potential to enable and/or improve applications such as transistors, transparent conductors, solar cells, batteries, and biosensors 1,2. This talk will delineate chemical strategies for enhancing the electronic and optical properties of these promising nanomaterials. For example, we have recently developed a scalable technique for sorting single-walled carbon nanotubes (SWNTs) by their physical and electronic structure using density gradient ultracentrifugation (DGU) 3,4. The resulting monodisperse SWNTs possess unprecedented uniformity in their electronic and optical properties, which enables the fabrication of high performance thin film field-effect transistors 5,6, infrared optoelectronic devices 5, and transparent conductors 7. The DGU technique also enables multi-walled carbon nanotubes to be sorted by the number of walls 8, and solution phase graphene to be sorted by thickness 9,10, thus expanding the suite of monodisperse carbon-based nanomaterials. By recently extending our DGU efforts to carbon nanotubes and graphene dispersed in biocompatible polymers (e.g., DNA, poloxamers, etc.), new opportunities have emerged for monodisperse carbon-based nanoelectronic materials in biomedical applications. As a final example, this talk will discuss the preparation and characterization of highly ordered self-assembled monolayers on graphene. In particular, self-assembled monolayers of perylene-based molecules are noncovalently formed on graphene via gas-phase deposition in ultra-high vacuum at room temperature 11, while covalent modification is achieved via solution-phase diazaonium chemistry 12. Ultimately, organic functionalization allows the chemical properties of graphene to be tailored for subsequent materials deposition in addition to presenting opportunities for graphene-based molecular electronic and sensing devices.
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WTHR 104, Purdue University, West Lafayette, IN