Bidimensional carbon materials such as graphene (G), graphene oxide (GO), and reduced graphene oxides (r-GO) combine interesting structural and optical functionalities for developping new materials for nano-bio applications. GO, generally produced from graphite in presence of oxidizing agents, is easily processable in liquid environment, possessing an excellent solubility in water and in some organic solvents. A variety of chemical and physical modifications of GO have been achieved, including the reduction to graphene-like sheets or surface functionalization (e.g., nitrogen-doping, metal doping, …). Induced chemical modifications in GO are generally mediated by the presence of atomic defects and of different types of covalent C-O groups, like carboxyl, epoxy and hydroxyl functionalities In this work we prepared GO (aqueous) and G (solid) samples, by the modified Hummers method and exfoliation method, respectively. Successively, several functionalization approaches were tested, including nanosecond pulsed laser irradiation, UV ozone treatment, chemical wet reduction methods and the reaction with amines. The linear and nonlinear optical properties at the interface with water, as well as the bio-interface with lipid vesicles and supported lipid bilayers were scrutinized through both experimental (Raman, dynamic light scattering and zeta potential, confocal microscopy, atomic force microscopy) and theoretical (molecular dynamics and density functional theory) studies.
|Titolo:||GRAPHENE–DERIVATIVES PREPARED BY CHEMICAL AND PHYSICAL APPROACHES FOR INVESTIGATION AT THE BIOINTERFACES WITH ARTIFICIAL MEMBRANES|
|Data di pubblicazione:||2014|
|Appare nelle tipologie:||4.3 Poster|