Reversible Hydrophobic to Hydrophilic Transition in Graphene via Water Splitting Induced by UV Irradiation

Xu, Zhemi; Ao, Zhimin; Younis, Adnan; Li, Chang Ming; Li, Sean

doi:10.1038/srep06450

Cited by 112 publications

(119 citation statements)

References 45 publications

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“…Previously, we attempted to tailor the surface property of graphene surface from hydrophobic to hydrophilic using several methods including O 2 plasma, 27,28 O 3 treatment, 29,30 UV irradiation, 31,32 surface chemical doping, 33 and electrical field. 34 …”

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confidence: 99%

Atomic Scale Study on Growth and Heteroepitaxy of ZnO Monolayer on Graphene

et al. 2016

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Atomically thin semiconducting oxide on graphene carries a unique combination of wide band gap, high charge carrier mobility, and optical transparency, which can be widely applied for optoelectronics. However, study on the epitaxial formation and properties of oxide monolayer on graphene remains unexplored due to hydrophobic graphene surface and limits of conventional bulk deposition technique. Here, we report atomic scale study of heteroepitaxial growth and relationship of a single-atom-thick ZnO layer on graphene using atomic layer deposition. We demonstrate atom-by-atom growth of zinc and oxygen at the preferential zigzag edge of a ZnO monolayer on graphene through in situ observation. We experimentally determine that the thinnest ZnO monolayer has a wide band gap (up to 4.0 eV), due to quantum confinement and graphene-like structure, and high optical transparency. This study can lead to a new class of atomically thin two-dimensional heterostructures of semiconducting oxides formed by highly controlled epitaxial growth.

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confidence: 99%

Atomic Scale Study on Growth and Heteroepitaxy of ZnO Monolayer on Graphene

et al. 2016

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“…These observations indicate that the interface between silica and water is indeed hydrophobic but plasma sputtering alters it by removing the polarized electrons of silica skin. These hydrophobic-hydrophilic transition of ZnO [109], graphene [110], and SiO 2 is beyond the description of the Wenzel-Cassie-Baster's law. However, observations comply with the presently proposed hydrophobicity and the hydrophobic-hydrophilic transition mechanism.…”

Section: Plasma Sputteringmentioning

confidence: 91%

“…Figures 10.15 and 10. 16 show the hydrophobic-hydrophilic transition of ZnO [109] and graphene [110].…”

Section: Uv Radiationmentioning

confidence: 99%

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Water Supersolid Skin

Sun

2016

Springer Series in Chemical Physics

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Skin molecular undercoordination not only disperses the quasisolid phase boundary but also derives supersolidity that is hydrophobic, less dense, viscoelastic, repulsive, and thermally stable.• The supersolidity and quasisolidity defines the anomalies of water skin when interact with other objects. • The skin supersolidity increases with its curvature but drops when heated due to depolarization. • Electrostatic repulsivity and elasticity claims the superhydrophobicity, superfluidity, superlubricity, and supersolidity at the contacting interface.Abstract Consistency in experimental observations, numerical calculations, and theoretical predictions revealed that skins of 25°C water and −(15-20)°C ice share the same attribute of supersolidity characterized by the identical H-O vibration frequency of 3450 cm −1 . Molecular undercoordination and inter-electron-pair repulsion shortens the H-O bond and lengthen the O:H nonbond, leading to a dual process of nonbonding electron polarization. This relaxation-polarization process enhances the dipole moment, elasticity, viscosity, thermal stability of these skins with 25 % density loss, which is responsible for the hydrophobicity and toughness of water skin and the superfluidity in a microchannel.

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“…The formation of nanopores by thermal oxidation of SLG helps in the quick diffusion of water adlayers. 28 Low temperature UHV STM studies of water exposure samples of graphene on Ru and Cu metal substrates showed discontinuity in Moiré patterns along the line defects in graphene. 13 Verdaguer et al 26 studied the formation of interfacial water adlayers between FLG and insulating BaF 2 and CaF 2 substrates and found that the IWLs are formed only in the case of the BaF 2 substrate due to the less lattice mismatch with hexagonal (I h ) ice.…”

Section: Introductionmentioning

confidence: 98%

The role of ambient ice-like water adlayers formed at the interfaces of graphene on hydrophobic and hydrophilic substrates probed using scanning probe microscopy

Gowthami

Tamilselvi

Jacob

et al. 2015

Phys. Chem. Chem. Phys.

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In this work, we report the role of ice-like water adlayers (IWLs) formed under ambient conditions in between mechanically exfoliated as-prepared and patterned few layer graphene (FLG) and multi-layer graphene (MLG) on hydrophobic Si and hydrophilic SiO2/Si substrates. The growth of the IWL is probed by measuring the height changes in graphene using intermittent contact atomic force microscopy (IC-AFM) and their electrostatic effect is studied using electrostatic force microscopy (EFM) over time. It is found that more IWLs are formed within a shorter period of time, when both as-prepared graphene and underlying substrates are either hydrophobic or hydrophilic in nature. In contrast, AFM voltage nanolithographically patterned trenches on FLG and MLG on the Si substrate show quick formation of IWLs. The effect of IWL formed, on the dimensions of trenches, is correlated with the variation of the measured EFM phase shift over time. This study demonstrates the dependence of the formation of IWLs under ambient conditions on the affinity towards water, at the interface of graphene on hydrophobic and hydrophilic substrates, which has important implications for the performance of graphene-based nanoelectronic devices.

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Reversible Hydrophobic to Hydrophilic Transition in Graphene via Water Splitting Induced by UV Irradiation

Cited by 112 publications

References 45 publications

Atomic Scale Study on Growth and Heteroepitaxy of ZnO Monolayer on Graphene

Atomic Scale Study on Growth and Heteroepitaxy of ZnO Monolayer on Graphene

Water Supersolid Skin

The role of ambient ice-like water adlayers formed at the interfaces of graphene on hydrophobic and hydrophilic substrates probed using scanning probe microscopy

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