Surface-Energy Engineering of Graphene

Shin, Yung Woo; Wang, Yingying; Huang, Han; Gopinadhan, K.; Wee, Andrew Thye Shen; Shen, Zexiang; Bhatia, Charanjit S.; Yang, Hyunsoo

doi:10.1021/la100231u

Cited by 445 publications

(400 citation statements)

References 32 publications

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“…The increase in adhesion was attributed to the creation of dangling bonds due to plasma treatment, which in turn acted as surface charge traps. This results were consistent with the findings of Shin et al 101 They determined that the defects created due to plasma treatment changed graphene form hydrophobic to hydrophilic. Using Raman spectroscopy and water contact angle measurements they were able to correlate degree of disorder with wettability.…”

Section: Nitrogen Functionalizationsupporting

confidence: 93%

Plasma engineering of graphene

Dey

Chroneos

Braithwaite

et al. 2016

Applied Physics Reviews

140

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Recently, there have been enormous efforts to tailor the properties of graphene.These improved properties extend the prospect of graphene for a broad range of applications. Plasmas find applications in various fields including materials science and have been emerging in the field of nanotechnology. This review focuses on different plasma functionalization processes of graphene and its oxide counterpart. The review aims at the advantages of plasma functionalization over the conventional doping techniques. Selectivity and controllability of the plasma techniques opens up future pathways for large scale, rapid functionalization of graphene for advanced applications. We also emphasize on atmospheric pressure plasma jet as the future prospect of plasma based functionalization processes.

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Section: Nitrogen Functionalizationsupporting

confidence: 93%

Plasma engineering of graphene

Dey

Chroneos

Braithwaite

et al. 2016

Applied Physics Reviews

140

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“…The contact angle θ is taken as that of a water droplet on graphite [20,21], approx. 90 The surface tension force of eq.…”

Section: The Surface Tension Force At the Contact Linementioning

confidence: 99%

On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

et al. 2016

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“…The interaction of the interfacial water with EG grown on SiC has been studied theoretically [18,19] and experimentally by frequency modulation AFM [20], highresolution X-ray analyses [21], vibrational spectroscopy [22], and contact angle goniometry [23]. It has been shown that the G 0 containing high number of sp 3 carbon-bonded inclusions chemically bonds the closest lying water molecules and, probably, blocks electrochemical reactions at the interface.…”

Section: Introductionmentioning

confidence: 99%

Insights into electrocatalytic activity of epitaxial graphene on SiC from cyclic voltammetry and ac impedance spectroscopy

Szroeder¹,

Tsierkezos

Walczyk³

et al. 2014

J Solid State Electrochem

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Electrocatalytic activity of graphene grown epitaxially on SiC is studied using cyclic voltammetry and electrochemical impedance spectroscopy. AFM images show steplike topography of SiC-graphene. For ferri-/ferrocyanide redox couple, no voltammetric response is observed at the pristine graphene. Basal planes of graphite are electrochemically inactive as well. After electrochemical oxidation, apparent redox peaks appear at both the graphene and graphite electrode. However, more intensive redox peaks are observed at graphene, where simultaneous redox reaction with the adsorbed and the diffused ferri-/ferrocyanide ions occurs. Electrochemical impedance measurements show that the graphene electrode behaves like an array of microelectrodes. We used the partially blocked electrode model to fit impedance data. Using the fitting parameters, a size of microelectrodes was found to be 23.8±2.1 μm and the active surface of graphene was estimated to be 21 %. A value of the standard electron transfer rate constant found for the anodized epitaxial graphene (2.16±0.32)×10) is by one order of magnitude lower than the standard rate constant estimated for the anodized graphite basal planes (∼5 × 10 − 2 cm ⋅ s − 1 ).Electrochemical reduction causes total disappearance of electrochemical responses at the graphene electrode, whereas only slight decrease of the peak currents is observed at the reduced graphene. Such behavior proves that different activation mechanisms occur at the graphene and graphite electrodes.

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Surface-Energy Engineering of Graphene

Cited by 445 publications

References 32 publications

Plasma engineering of graphene

Plasma engineering of graphene

On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

Insights into electrocatalytic activity of epitaxial graphene on SiC from cyclic voltammetry and ac impedance spectroscopy

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