Recent research activities on biomaterials have focused their experimental and theoretical studies on the structure and reactivity of water at graphene surfaces, ideal model systems for 2-dimensional surface science The study of biomolecules adsorbed at the graphene-liquid interface is critical for advanced applications of graphene-based hybrid nanomaterials in life science. Herein an integrated approach with fluorescence confocal microscopy coupled with Raman spectroscopy and DFT modeling was employed to provide a description of solvent and solute interaction with nanosized sp2-carbon sheets, including single, double and few layer graphene. 2D graphene domains were fabricated by mechanical exfoliation and/or by chemical reduction of graphene oxide. The as prepared surfaces were modified by UV-ozone treatment. Results emphasize the role of size (in terms of number of graphene layers) and surface termination of the nanoscaled carbon structures to drive the charge transfer phenomena and orientation of the hydrogen-bonded water molecules at the interfacial region. A case study with lipid molecules self-assembling at the graphene based surfaces is reported.

Graphene-liquid biointerface: the thickness and surface modification role

SATRIANO, Cristina;D'URSO, LUISA;FORTE, GIUSEPPE;COMPAGNINI, Giuseppe Romano
2013

Abstract

Recent research activities on biomaterials have focused their experimental and theoretical studies on the structure and reactivity of water at graphene surfaces, ideal model systems for 2-dimensional surface science The study of biomolecules adsorbed at the graphene-liquid interface is critical for advanced applications of graphene-based hybrid nanomaterials in life science. Herein an integrated approach with fluorescence confocal microscopy coupled with Raman spectroscopy and DFT modeling was employed to provide a description of solvent and solute interaction with nanosized sp2-carbon sheets, including single, double and few layer graphene. 2D graphene domains were fabricated by mechanical exfoliation and/or by chemical reduction of graphene oxide. The as prepared surfaces were modified by UV-ozone treatment. Results emphasize the role of size (in terms of number of graphene layers) and surface termination of the nanoscaled carbon structures to drive the charge transfer phenomena and orientation of the hydrogen-bonded water molecules at the interfacial region. A case study with lipid molecules self-assembling at the graphene based surfaces is reported.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/109297
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