Presented by Dr. Li-Hong Liu from Portland State University
Nanomaterials have proven themselves to have significant range of application in a variety of aspects of biology, medicine, environment, and energy. The most critical part of nanomaterials that makes them special is their enlarged surface area. Careful and selective surface treatment can tailor the nanomaterial of choice for the right applications. Selecting right ligand and proper coupling method for functionalizing nanomaterial surface is of great interest and challenge to both academic and industrial communities.
Graphene, with its π electrons delocalized over the entire 2D sheet of conjugated sp2 carbon atoms network, is fairly chemically inert compared to fullerene and carbon nanotubes with curved structures and misaligned π-orbitals. It is of challenge to find reactive species to the sp2 carbon structures that are required to covalent functionalization of graphene. In this talk, I will present our successful work on covalent functionalization of pristine graphene with perfluorophenyl azides both in solution phase and in solid state.
Core-shell nanoparticles are attracting more and more attention because it could incorporate several different functional materials into a single nanostructure that can then perform several tasks in parallel. In this talk, I will also introduce research background and discuss our effort in synthesis of magnetic-fluorescent bimodal core-shell nanoparticles. This kind of nanocomposite mainly arises from possible biological applications of multimodal imaging (fluorescent imaging and magnetic resonance imaging) in combination with magnetic field assisted transport, as well as sensing and separation.
Dr. Li-Hong Liu received Ph.D. in analytical chemistry from Xiamen University, China in 2005. He joined Department of Chemistry at Portland State University as a research associate in 2007. Before that, he was a postdoctoral research fellow at École Normale Supérieure de Cachan, France. His research interests and experiences include functional surfaces and interfaces, graphene-based materials and devices, optical functional materials, chemical and biological sensors, self-assembled supramolecular structure, photophysics and photochemistry.