H<sub>2</sub>O on Graphene/Ir(111): A Periodic Array of Frozen Droplets

Standop, Sebastian; Michely, Thomas; Busse, Carsten

doi:10.1021/jp510140a

Cited by 16 publications

(24 citation statements)

References 41 publications

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“…2c. Such behaviour is consistent with the strongly hydrophobic behaviour previously seen on pristine graphene 13,35,36 and a similar behaviour has been observed for water on other metal-supported graphene systems 33,37 . The formation of islands provides the first indication that in this regime, water molecules must be able to diffuse freely over the graphene surface.…”

Section: Resultssupporting

confidence: 91%

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

et al. 2021

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The interfacial behaviour of water remains a central question to fields as diverse as protein folding, friction and ice formation. While the properties of water at interfaces differ from those in the bulk, major gaps in our knowledge limit our understanding at the molecular level. Information concerning the microscopic motion of water comes mostly from computation and, on an atomic scale, is largely unexplored by experiment. Here, we provide a detailed insight into the behaviour of water monomers on a graphene surface. The motion displays remarkably strong signatures of cooperative behaviour due to repulsive forces between the monomers, enhancing the monomer lifetime ( ≈ 3 s at 125 K) in a free-gas phase that precedes the nucleation of ice islands and, in turn, provides the opportunity for our experiments to be performed. Our results give a molecular perspective on a kinetic barrier to ice nucleation, providing routes to understand and control the processes involved in ice formation.

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Section: Resultssupporting

confidence: 91%

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

et al. 2021

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“…16 In presence of less reactive adsorbates, such as H 2 O or small organic molecules, though, only physisorption was detected. 17,18 Following recent experimental work, 19 we analyze here the case of G deposited on a Ni(111) substrate, providing theoretical confirmation of enhanced G chemical reactivity upon CO adsorption. While the interaction between gaseous CO and free-standing G is controlled by weak long-range correlation effects, we find that, in presence of the Ni(111) substrate, two CO monomers can merge into chemisorbed ethylene dione (C 2 O 2 ).…”

mentioning

confidence: 94%

Communication: Enhanced chemical reactivity of graphene on a Ni(111) substrate

Ambrosetti

Silvestrelli

2016

The Journal of Chemical Physics

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Due to the unique combination of structural, mechanical, and transport properties, graphene has emerged as an exceptional candidate for catalysis applications. The low chemical reactivity caused by sp2 hybridization and strongly delocalized π electrons, however, represents a main challenge for straightforward use of graphene in its pristine, free-standing form. Following recent experimental indications, we show that due to charge hybridization, a Ni(111) substrate can enhance the chemical reactivity of graphene, as exemplified by the interaction with the CO molecule. While CO only physisorbs on free-standing graphene, chemisorption of CO involving formation of ethylene dione complexes is predicted in Ni(111)-graphene. Higher chemical reactivity is also suggested in the case of oxidized graphene, opening the way to a simple and efficient control of graphene chemical properties, devoid of complex defect patterning or active metallic structures deposition.

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“…16 It was recently demonstrated that frozen water clusters of ∼1 nm size can be periodically arranged on graphene/Ir(111). 8 The arrangement of the water molecules inside the droplets is presumed to be amorphous, but their internal structure and phase has not been experimentally determined to this point. The moiré pattern of graphene on Ir(111) has a periodicity of 2.53 nm and provides an elegant way to decorate the surface with a high density of small nanoparticles with diameters up to 1.5 nm.…”

Section: Introductionmentioning

confidence: 99%

“…Recent scientific work concerns water at various interfaces, where it forms patterns of molecular wetting layers. It was reported that water on surfaces can form half-dissociated adlayers, ordered structures as 2D stripes and patches, or self-assembled nanosized clusters . The interaction with a substrate is reported to lead to a preferential orientation of the water molecules, − which hence has impact on micro- to macroscopic properties of water, for example, the flux through channels inside filtration membranes or other nanochannels .…”

Section: Introductionmentioning

confidence: 99%

Interaction of Water with Graphene/Ir(111) Studied by Vibrational Spectroscopy

et al. 2019

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Water in confinement exhibits altered properties in molecular arrangement, bonding and interaction with its neighboring environment, as compared to its bulk counterpart. In this work, periodically arranged D 2 O nano droplets of ∼1 nm size on top of a graphene-iridium moiré superstructure were investigated by Fourier transformation reflection absorption infrared spectroscopy under ultrahigh vacuum conditions at ∼120 K. The infrared bands of D 2 O clusters differ significantly from those observed for bulk D 2 O amorphous solid water or crystalline ice phases. Blue shifted symmetric and asymmetric stretching bands with narrower band widths and modified band intensity ratios were observed, pointing to an enhanced internal order and a reduced nearest neighbor distance. Furthermore, two IR bands of 'dangling' deuterium atoms were detected originating from threefold coordinated water molecules at the surface of the clusters and at their interface to the graphene layer. The latter arose only with the transition from the water clusters to an amorphous solid water layer. We propose that upon coalescence, opposing local dipoles trigger a hydrogen bond rearrangement 1

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H₂O on Graphene/Ir(111): A Periodic Array of Frozen Droplets

Cited by 16 publications

References 41 publications

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

Communication: Enhanced chemical reactivity of graphene on a Ni(111) substrate

Interaction of Water with Graphene/Ir(111) Studied by Vibrational Spectroscopy

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H2O on Graphene/Ir(111): A Periodic Array of Frozen Droplets

Cited by 16 publications

References 41 publications

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

Communication: Enhanced chemical reactivity of graphene on a Ni(111) substrate

Interaction of Water with Graphene/Ir(111) Studied by Vibrational Spectroscopy

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H₂O on Graphene/Ir(111): A Periodic Array of Frozen Droplets