Water adsorption on graphene/Pt(111) at room temperature: A vibrational investigation

Abstract

Water interaction with quasi-freestanding graphene deposited on Pt(111) has been investigated by using vibrational spectroscopy. Loss measurements show that water molecules dosed at room temperature can dissociate giving rise to C-H bonds. The formation of the C-H bonds strongly attenuates the optical phonons of the graphene sheet. On the other hand, at 100 K water has been found to adsorb only in molecular state. Present findings should be taken into account in engineering graphene-based devices which should work at atmospheric pressure and at room temperature

Spatial variability in large area single and few-layer CVD graphene

“…5. The features we observe near 0.4 eV (2900 cm -1 ) are due to C-H vibrations bands caused by water absorption on graphene [16]. The peaks in mid-IR near 0.2 eV, were previously observed in single and multilayer graphene [17] and were associated with different band structures of multilayer graphene flakes.…”

Probing growth dynamics of graphene/Ru(0001) and the effects of air exposure by means of helium atom scattering

“…On the latticemismatched graphene/Ru(0001) interface, the corrugation of the graphene overlayer induces site selectivity for H adsorption in dimers. Instead, no dimer formation has been reported to occur in the nearly-flat, multidomain graphene/Pt(1 1 1) interface [54].…”

A Molecular View of Adsorption on Nanostructured Carbon Materials

“…151 Rafiee et al studied the wetting of graphene sheets by water and reported that graphene sonicated in water, acetone or a combination of water and acetone showed different contact angles with water droplet ranging from super-hydrophobic to super-hydrophilic behavior. 152 The molecular arrangement of water on graphene surface has also been studied by Kimmel et al who deposited thin films of H 2 O or D 2 O on graphene substrate at temperatures ranging from 20 to 152 K. It was found that ice layers formed on the graphene surface, showing significant wetting at 135 K. 153,154 At higher temperatures, these ice layers de-wet the surface forming ice crystals. The presence of a vacancy changed the adsorption energy of water for graphene.…”