Adsorption of water on graphene/Ru(0001)—an experimental ultra-high vacuum study

Chakradhar, A.; Burghaus, U.

doi:10.1039/c4cc02762k

Cited by 21 publications

(22 citation statements)

References 36 publications

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“…3. Similar to graphene/Ru, 18 only one TDS peak is evident which shifts slightly to greater temperatures with increasing exposures. The exponential rise at low temperature and common leading edges are all indicative of the sublimation of ice and approximate zero-order kinetics.…”

Section: Figure 2 Kinetics Parameter For Water Onmentioning

confidence: 95%

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Support effects in the adsorption of water on CVD graphene: an ultra-high vacuum adsorption study

et al. 2015

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Section: Figure 2 Kinetics Parameter For Water Onmentioning

confidence: 95%

“…18,23 According to our experiments, water adsorption kinetics and wettability on a clean ruthenium support and on graphene/ruthenium were very different, i.e., graphene is not "transparent". Several important questions remain unanswered.…”

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confidence: 86%

Support effects in the adsorption of water on CVD graphene: an ultra-high vacuum adsorption study

et al. 2015

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“…Water adsorption kinetics was characterized for graphene/Ru(0001) in UHV [11]. Briefly, as evident from Figure 1, over the entire exposure range, including sub-monolayer (0.6-2.5 L) and multilayer (3.5-15 L) exposures, only a single peak, which is typical for a condensation peak is seen.…”

Section: Water Adsorption On Graphenementioning

confidence: 99%

“…(Hydrophobic graphene adsorbed on hydrophilic substrate.) In addition, studies of this kind on different supports revealed support effects, i.e., graphene is not necessarily always hydrophobic [11,12,26]. …”

Section: Water Adsorption On Graphenementioning

confidence: 99%

“…In addition, CVD graphene samples bear the potential risk of a high defect density and may have patches on the surface that may be covered by more than one atomic layer of carbon. When I became aware of the discussion in the literature, the obvious task for a surface chemist was to determine the wetting properties at ultra-high vacuum (UHV), clean, conditions [11,12]; preferentially on higher quality physical vapor deposited (PVD) graphene samples [11].…”

Section: Functionalized Graphene and Water Adsorptionmentioning

confidence: 99%

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Adsorption of Water on Two-Dimensional Crystals: Water/Graphene and Water/Silicatene

Burghaus

2016

Inorganics

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Abstract:The adsorption of water on solid surfaces is a scientific evergreen which again recently prompted considerable attention in the materials, nano-, and surface science communities, respectively, due to conflicting evidence presented in the most highly regarded scientific journals. This mini review is a brief and personal perspective of the current literature (and our own data) about water adsorption for two examples, namely graphene and silicatene, which are both two-dimensional (2D) crystals. Silicatene, an inorganic companion of graphene, is intriguing as it presents us with the possibility to synthesize a 2D analog to zeolites by doping this crystalline silicon film. The wettability by water and whether or not support effects of epitaxial 2D crystals are present is of concern. Regarding applications: some 2D crystals appear promising for the hydrogen evolution reaction, i.e., hydrogen generation from water; a functionalization of graphene (by oxygen/water) to graphene oxide may be interesting for metal-free catalysis; the latest highlight in this field appears to be "icephobicity", an application related to the hydrophobicity of surfaces.

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Initial Subsurface Incorporation of Oxygen into Ru(0001): A Density Functional Theory Study

et al. 2015

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The adsorption and diffusion of oxygen on Ru(0001) surfaces as a function of coverage are systematically investigated by using density functional theory. A high incorporation barrier of low-coverage adsorbed oxygen into the subsurface is discovered. Calculations show that the adsorption of additional on-surface oxygen can lower the penetration barrier dramatically. The minimum penetration barrier obtained is 1.81 eV for a path starting with oxygen in mixed on-surface hcp and fcc sites at an oxygen coverage of 0.75 ML, which should be regarded as close to 1 ML. Energy diagrams show that oxygen-diffusion barriers on the surface and in the subsurface are much lower than the penetration barrier. Oxygen diffusion on the surface is an indispensable step for its initial incorporation into the subsurface.

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Adsorption of water on graphene/Ru(0001)—an experimental ultra-high vacuum study

Cited by 21 publications

References 36 publications

Support effects in the adsorption of water on CVD graphene: an ultra-high vacuum adsorption study

Support effects in the adsorption of water on CVD graphene: an ultra-high vacuum adsorption study

Adsorption of Water on Two-Dimensional Crystals: Water/Graphene and Water/Silicatene

Initial Subsurface Incorporation of Oxygen into Ru(0001): A Density Functional Theory Study

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