Reversible hydrogenation restores defected graphene to graphene

AbstractGraphene as a two-dimensional material is prone to hydrocarbon contaminations, which can significantly alter its intrinsic electrical properties. Herein, we implement a facile hydrogenation-dehydrogenation strategy to remove hydrocarbon contaminations and preserve the excellent transport properties of monolayer graphene. Using electron microscopy we quantitatively characterized the improved cleanness of hydrogenated graphene compared to untreated samples. In situ spectroscopic investigations revealed that the hydrogenation treatment promoted the adsorption ofytyt water at the graphene surface, resulting in a protective layer against the re-deposition of hydrocarbon molecules. Additionally, the further dehydrogenation of hydrogenated graphene rendered a more pristine-like basal plane with improved carrier mobility compared to untreated pristine graphene. Our findings provide a practical post-growth cleaning protocol for graphene with maintained surface cleanness and lattice integrity to systematically carry a range of surface chemistry in the form of a well-performing and reproducible transistor.

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Universal mobility characteristics of graphene originating from charge scattering by ionised impurities

Communications Physics ◽

10.1038/s42005-021-00518-2 ◽

2021 ◽

Vol 4 (1) ◽

Author(s):

Jonathan H. Gosling ◽

Oleg Makarovsky ◽

Feiran Wang ◽

Nathan D. Cottam ◽

Mark T. Greenaway ◽

...

Keyword(s):

Electrical Conductivity ◽

Carrier Density ◽

Carrier Mobility ◽

Carrier Transport ◽

Analytical Models ◽

Pristine Graphene ◽

High Electron ◽

Boltzmann Transport ◽

Transport Parameters ◽

Wide Range

AbstractPristine graphene and graphene-based heterostructures can exhibit exceptionally high electron mobility if their surface contains few electron-scattering impurities. Mobility directly influences electrical conductivity and its dependence on the carrier density. But linking these key transport parameters remains a challenging task for both theorists and experimentalists. Here, we report numerical and analytical models of carrier transport in graphene, which reveal a universal connection between graphene’s carrier mobility and the variation of its electrical conductivity with carrier density. Our model of graphene conductivity is based on a convolution of carrier density and its uncertainty, which is verified by numerical solution of the Boltzmann transport equation including the effects of charged impurity scattering and optical phonons on the carrier mobility. This model reproduces, explains, and unifies experimental mobility and conductivity data from a wide range of samples and provides a way to predict a priori all key transport parameters of graphene devices. Our results open a route for controlling the transport properties of graphene by doping and for engineering the properties of 2D materials and heterostructures.

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Stabilize lithium metal anode through in-situ forming a multi-component composite protective layer

Chemical Engineering Journal ◽

10.1016/j.cej.2021.129911 ◽

2021 ◽

pp. 129911

Author(s):

Saisai Li ◽

Yun Huang ◽

Wenhao Ren ◽

Xing Li ◽

Mingshan Wang ◽

...

Keyword(s):

Protective Layer ◽

Lithium Metal ◽

Metal Anode ◽

In Situ Forming ◽

Lithium Metal Anode

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A multifunctional artificial protective layer for producing an ultra-stable lithium metal anode in a commercial carbonate electrolyte

Journal of Materials Chemistry A ◽

10.1039/d1ta00408e ◽

2021 ◽

Vol 9 (12) ◽

pp. 7667-7674

Author(s):

Song Li ◽

Xian-Shu Wang ◽

Qi-Dong Li ◽

Qi Liu ◽

Pei-Ran Shi ◽

...

Keyword(s):

Protective Layer ◽

Stable Cycle ◽

Lithium Metal ◽

Lithium Ions ◽

Metal Anode ◽

Lithium Metal Anode

A multifunctional artificial protective layer is in situ fabricated on the surface of Li anode, which facilitates stable cycle of Li anode in carbonate electrolyte by forming a unique SEI and inducing homogeneous deposition of lithium ions.

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Adsorption of dihalogen molecules on pristine graphene surface: Monte Carlo and molecular dynamics simulation studies

Journal of Molecular Modeling ◽

10.1007/s00894-017-3311-2 ◽

2017 ◽

Vol 23 (5) ◽

Cited By ~ 6

Author(s):

Berkay Sütay ◽

Mine Yurtsever

Keyword(s):

Molecular Dynamics ◽

Monte Carlo ◽

Molecular Dynamics Simulation ◽

Dynamics Simulation ◽

Pristine Graphene ◽

Simulation Studies ◽

Graphene Surface

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In-situ covalently bonded supramolecular-based protective layer for improving chlorine resistance of thin-film composite nanofiltration membranes

Desalination ◽

10.1016/j.desal.2019.114197 ◽

2020 ◽

Vol 474 ◽

pp. 114197 ◽

Cited By ~ 11

Author(s):

Xuewu Zhu ◽

Xiaoxiang Cheng ◽

Jiajian Xing ◽

Tianyu Wang ◽

Daliang Xu ◽

...

Keyword(s):

Thin Film ◽

Protective Layer ◽

Nanofiltration Membranes ◽

Film Composite ◽

Thin Film Composite ◽

Covalently Bonded

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Majority and minority carrier mobility behavior and device modeling of doped CVD monolayer graphene transistors

68th Device Research Conference ◽

10.1109/drc.2010.5551929 ◽

2010 ◽

Cited By ~ 3

Author(s):

Osama M. Nayfeh ◽

Stephen Kilpatrick ◽

Madan Dubey

Keyword(s):

Carrier Mobility ◽

Minority Carrier ◽

Monolayer Graphene ◽

Device Modeling ◽

Mobility Behavior ◽

Minority Carrier Mobility

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In situ SEM/STM observations and growth control of monolayer graphene on SiC (0001) wide terraces

Surface and Interface Analysis ◽

10.1002/sia.6098 ◽

2016 ◽

Vol 48 (11) ◽

pp. 1221-1225 ◽

Cited By ~ 4

Author(s):

Chenxing Wang ◽

Hitoshi Nakahara ◽

Yahachi Saito

Keyword(s):

Growth Control ◽

Monolayer Graphene

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Preparation of Pd@Gr Composite Materials and Research on Catalytic Performance

Materials Science Forum ◽

10.4028/www.scientific.net/msf.944.671 ◽

2019 ◽

Vol 944 ◽

pp. 671-677

Author(s):

Jin Feng Leng ◽

Kang Wang ◽

Chang Peng Xia

Keyword(s):

Reduction Method ◽

Chemical Reduction ◽

Great Influence ◽

Pd Nanoparticles ◽

Catalytic Performance ◽

Chemical Oxidation ◽

Chemical Reduction Method ◽

Graphene Surface ◽

Oxidation Reduction

In this work, the preparation of graphene by chemical oxidation reduction method and a series of chemical reactions to get graphene oxide, with the preparation of graphene composites by simply chemical reduction method for the preparation of palladium/graphene composites. Through the chemical reduction method, the small size of Pd nanoparticles is acquired by controlling the content of reducing agent. The Pd nanoparticles on graphene surface is 10nm size and evenly distributed. Pd2+ adsorption on graphene surface and in situ were partially reduced to Pd to Pd2+ nanoparticles by the reducibility of graphene. In the process, the graphene was reduced to graphene and the final compound was thinner and more transparent than the pre-experiment oxide. The oxygen-containing functional groups on the surface of the graphene have influence to the nucleation and growth of metal nanoparticles and KI can control the morphology and size of nanoparticles. The particle size and dispersion uniformity have great influence on the catalytic performance of composites, the smaller particles have better catalytic performance. Keywords:palladium, graphene composites, nanoparticles

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In situ formation of highly controllable and stable Na3PS4 as a protective layer for Na metal anode

Journal of Materials Chemistry A ◽

10.1039/c8ta10174d ◽

2019 ◽

Vol 7 (8) ◽

pp. 4119-4125 ◽

Cited By ~ 15

Author(s):

Yang Zhao ◽

Jianwen Liang ◽

Qian Sun ◽

Lyudmila V. Goncharova ◽

Jiwei Wang ◽

...

Keyword(s):

Protective Layer ◽

Metal Anode ◽

In Situ Formation

A facile and in situ solution-based method has been developed to synthesize an artificial protective layer of NaPS on the surface of Na metal with high stable performances.

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