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

Chakradhar, A.; Sivapragasam, Nilushni; Nayakasinghe, M. T.; Burghaus, U.

doi:10.1039/c5cc03827h

Cited by 27 publications

(25 citation statements)

References 41 publications

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“…Indeed, it was observed by Chakradhar et al. that annealing in UHV conditions at temperatures above 650 K resulted in significant damage to the sample . Our results from Raman spectroscopy (see below) also support this conclusion.…”

Section: Resultssupporting

confidence: 89%

“…Intercalated water between graphene and Cu(111) can induce graphene fragmentation at line defects . During heating, intercalated molecules can be also trapped in the space between graphene and support, and their desorption can be thus partially inhibited . Although we have identified by XPS a small amount of CO and water species compared to overall carbon amount (concentration ratio CO/C ≤0.05; H 2 O/C ≤0.07), as shown in Figure B and Figure respectively, the majority of desorbed water and CO molecules (Figure A) seem to originate from chemical reactions induced by heating of the sample.…”

Section: Resultsmentioning

confidence: 78%

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Decomposition of Fluorinated Graphene under Heat Treatment

Plšek

Drogowska

Valeš

et al. 2016

Chemistry A European J

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Fluorination modifies the electronic properties of graphene, and thus it can be used to provide material with on-demand properties. However, the thermal stability of fluorinated graphene is crucial for any application in electronic devices. Herein, X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption (TPD), and Raman spectroscopy were used to address the impact of the thermal treatment on fluorinated graphene. The annealing, at up to 700 K, caused gradual loss of fluorine and carbon, as was demonstrated by XPS. This loss was associated with broad desorption of CO and HF species, as monitored by TPD. The minor single desorption peak of CF species at 670 K is suggested to rationalize defect formation in the fluorinated graphene layer during the heating. However, fluorine removal from graphene was not complete, as some fraction of strongly bonded fluorine can persist despite heating to 1000 K. The role of intercalated H2 O and OH species in the defluorination process is emphasised.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 78%

Decomposition of Fluorinated Graphene under Heat Treatment

Plšek

Drogowska

Valeš

et al. 2016

Chemistry A European J

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“…Since after the dissolving process traces of PMMA might remain on the graphene, it is suggested to anneal for several hours under vacuum at temperatures around 300 °C for graphene surfaces with minimum contaminants. Through this method, graphene‐coated SiO 2 and ZnO samples among others, have been prepared and studied.…”

Section: Preparation Strategies For Graphene‐coated Metal Oxide Supportsmentioning

confidence: 99%

A Brief Review of the Synthesis and Catalytic Applications of Graphene‐Coated Oxides

Luo

Zafeiratos

2017

ChemCatChem

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The potential applications of graphene‐based materials in catalysis have been intensively studied owing to the unique 2D structure of graphene and its superior physicochemical properties. Recently, graphene‐coated oxide composites have been fabricated and tested as catalysts or catalytic supports, demonstrating a significant improvement on the catalytic performance. This article briefly reviews the recent progress in the design and fabrication of graphene‐coated oxides including wet transfer, chemical vapor deposition and self‐assembly methods. The applications of these materials in catalysis as well as the role of graphene in the modification of oxide properties and the enhancement of catalytic activity are also discussed.

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“…(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%

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

Cited by 27 publications

References 41 publications

Decomposition of Fluorinated Graphene under Heat Treatment

Decomposition of Fluorinated Graphene under Heat Treatment

A Brief Review of the Synthesis and Catalytic Applications of Graphene‐Coated Oxides

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

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