Nanotopography of graphene

被引：22

作者：

Bangert, U. ^{[1
]}

Gass, M. H. ^{[2
]}

Bleloch, A. L. ^{[2
]}

Nair, R. R. ^{[1
,3
]}

Eccles, J. ^{[2
]}

机构：

[1] Univ Manchester, Sch Mat, Manchester M1 7HS, Lancs, England

[2] CCLRC Daresbury Lab, SuperSTEM Labs, Warrington WA4 4AD, Cheshire, England

[3] Univ Manchester, Sch Phys & Astron, Manchester M1 7HS, Lancs, England

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2009年 / 206卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

FREESTANDING GRAPHENE; RIPPLES; IMAGE;

D O I：

10.1002/pssa.200982207

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microscopically clean graphene surfaces are scrutinized via atomic resolution high angle dark field imaging and electron energy loss spectroscopy for presence of adsorbed atoms. Carbon ad-atoms can be observed in dark field images, whereas hydrogen is revealed in electron loss spectra. Spectrum images show the spatial distribution of hydrogen in pristine and deliberately H-dosed graphene; hydrogen is found on all graphene surfaces but the coverage is higher and more uniform in dosed samples. On clean surfaces the energy loss is characteristic of the ground level excitation in atomic hydrogen, whereas a spread in the hydrogen energy levels is found in hydrocarbon deposits. A rippling effect in the graphene sheets is revealed when lattice images are processed using fast Fourier transform (FFT) techniques. This contrast effect originates from changes in the bond length projection, due to inclinations of the sheet. It is suggested that point defects - vacancies and ad-atomes - influence the ripple patterns. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2115 / 2119

页数：5

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ITO A, PREPRINT

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