A nanoscopic approach to studying evolution in graphene wettability

Lai, Chia-Yun; Tang, Tzu‐Chieh; Amadei, Carlo A.; Marsden, Alexander J.; Verdaguer, Albert; Wilson, Neil R.; Chiesa, Matteo

doi:10.1016/j.carbon.2014.09.034

Cited by 67 publications

(80 citation statements)

References 58 publications

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“…This is reasonable considering the reported shielding effect of graphene in air 46 and in water 47 . The different interfacial structure of [EMIM][TFSI] on graphene compared to gold at the same potential must rely on specific surface IL-interactions.…”

Section: Discussionsupporting

confidence: 89%

Insight into the Electrical Double Layer of an Ionic Liquid on Graphene

Jurado

Espinosa‐Marzal

2017

Sci Rep

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Graphene is a promising next-generation conducting material with the potential to replace traditional electrode materials in supercapacitors. Since energy storage in supercapacitors relies on the electrolyte-electrode interface, here we elucidate the interfacial subnanometer structure of a single component liquid composed solely of cations and anions – an ionic liquid- on electrified graphene. We study the effect of applied potential on the interaction between graphene and a silicon tip in an ionic liquid and describe it within the framework of the Derjaguin-Landau-Verwey-Overbeck (DLVO) theory. The energy is stored in an electrical double layer composed of an extended Stern layer, which consists of multiple ion layers over ~2 nanometers, beyond which a diffuse layer forms to compensate the applied potential on graphene. The electrical double layer significantly responds to the applied potential, and it shows the transition from overscreening to crowding of counterions at the interface at the highest applied potentials. It is proposed that surface charging occurs through the adsorption of the imidazolium cation to unbiased graphene (likely due to π-π interactions) and that the surface potential is better compensated when counterion crowding happens. This study scrutinizes the electrified graphene-ionic liquid interface, with implications not only in the field of energy storage, but also in lubrication.

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Section: Discussionsupporting

confidence: 89%

Insight into the Electrical Double Layer of an Ionic Liquid on Graphene

Jurado

Espinosa‐Marzal

2017

Sci Rep

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“…76,230,241 Similar results were also reported for monolayer graphene on copper and multilayer graphene on nickel 75,77 and the surface energy and wettability of freshly synthesized graphene on copper was found to be dependent upon exposure time to ambient air. 75 Lai et al attributed the change in graphene wettability to adsorption of both water molecules and hydrocarbons 63 and Nioradze et al demonstrated that HOPG electroactivity is significantly affected by organic impurities in water and air. 59,62 Boinovich et al also showed that hydrocarbon contaminants spontaneously adsorb onto boron nitride nanotubes (BNNTs) and render the BNNTs to be hydrophobic, suggesting that other 2D materials are susceptible to spontaneous hydrocarbon contamination.…”

Section: Discussionmentioning

confidence: 99%

“…and the degree in which hydrocarbon and water adsorption influence wettability. 63,64 Importantly, this concept is becoming better understood as more researchers realize the importance of hydrocarbon contamination on graphitic surfaces and take into account exposure time in air when conducting experiments and fabricating devices. Work by Tadros, Hu, and…”

Section: Static Water Contact Anglementioning

confidence: 99%

Understanding the intrinsic water wettability of graphite

Kozbial¹,

Li²,

Sun³

et al. 2014

Carbon

189

244

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“…The results are qualitatively in agreement with macroscopic results and they share three aspects with the macroscopic SCA. 50 We also analysed the nanoscale dissipative interactions, calculating the energy dissipation (E dis ) between the oscillating tip and the surface, with the use of the Cleveland equation 41 (see ESI †). In particular, SCA ESEM for GML/Au and GML/Pt is z15 and z25 higher compared to the bare Au and Pt respectively, which underlines the importance of GML in varying the surface wettability.…”

Section: Wettability Analysismentioning

confidence: 99%

Elucidation of the wettability of graphene through a multi-length-scale investigation approach

Amadei

Lai²,

Esplandiu

et al. 2015

RSC Adv.

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Univocal conclusions around the wettability of graphene exposed to environmental conditions remain elusive despite the recent efforts of several research groups. The main discrepancy rests on the question of whether a graphene monolayer (GML) is transparent or not to water and more generally what the role is that the substrate plays in determining the degree of wetting of the GML. In this work, we investigate the water transparency of GML by means of a multi-length-scale approach. We complement traditional static contact angle measurements and environmental scanning electron microscopy experiments with atomic force microscopy based force spectroscopy to assess the role that intermolecular interactions play in determining the wetting of GML. To gain deeper insight into the wetting transparency issue, we perform experiments on inert metals, such as gold and platinum, covered or not covered by GML. The comparison of the results obtained for different systems (i.e. GML covered and uncovered inert metals), provides unambiguous evidence that supports the non-wetting transparency theory of GML. This work aims to assist the development of technologies based on graphene-water interaction, such as graphitic membranes for water separation processes. Fig. 5 Tip/surface dissipative interactions by means of AFM. (a) Dissipative interactions according to Cleveland's equation. 41 Energy dissipation for GML on metal substrate and bare metal. Data on the left hand side and right hand side refer to Pt system and Au system respectively. (b) Normalized energy dissipation profile of Pt system. Black line represents for bare Pt and gray line represents for GML/Pt. Red circles represent inflection points related to the presence of capillary phenomena.This journal is

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A nanoscopic approach to studying evolution in graphene wettability

Cited by 67 publications

References 58 publications

Insight into the Electrical Double Layer of an Ionic Liquid on Graphene

Insight into the Electrical Double Layer of an Ionic Liquid on Graphene

Understanding the intrinsic water wettability of graphite

Elucidation of the wettability of graphene through a multi-length-scale investigation approach

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