Water structure and charge transfer phenomena at the liquid-graphene interface

• Published in: Physical chemistry chemical physics : PCCP Vol. 14; no. 42; pp. 1465 - 1461
• Main Authors: D'Urso, Luisa, Satriano, Cristina, Forte, Giuseppe, Compagnini, Giuseppe, Puglisi, Orazio
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 14.11.2012
• Subjects: Charge transfer; Chemistry; Clusters; Confocal; Disorders; Electron Transport; Exact sciences and technology; General and physical chemistry; Graphical user interface; Graphite - chemistry; Hydrogen Bonding; Lasers; Microscopy, Confocal; Molecular Structure; Networks; Quantum Theory; Spectrum Analysis, Raman; Surface physical chemistry; Three dimensional; Water - chemistry; Water; Theoretical study; Confocal microscopy; Air; Perturbation; Orientation; Vibrational transition; Liquid; Graphene; Laser; Density functional method; Raman spectrometry; Aqueous solution; Structure; Charge transfer; Raman spectrum; Interface; Physicochemical properties; Hydrogen bond
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c2cp42249b

Physicochemical properties of the graphene-water interface have been investigated to scrutinize the perturbations with respect to the graphene-air interface, in terms of changes in optical and vibrational spectra, as well as in the 3D network of water. Experimental investigations were carried out using Raman spectroscopy and laser scanning confocal microscopy, and integrated with density functional theory (DFT) calculations. Results evidence a substantial orientation of the hydrogen-bonded water molecules at the interfacial region, which, in turn, induces disorder in the water clusters and interfacial charge transfer phenomena. Water-induced graphene p-doping and preferential orientation of hydrogen-bonded water at the interface with graphene are demonstrated by comparative experimental (Raman spectroscopy and confocal microscopy) and theoretical (DFT) investigations.