Tunable Band Gap in Hydrogenated Quasi-Free-standing Graphene

被引：296

作者：

Haberer, D. ^{[1
]}

Vyalikh, D. V. ^{[2
]}

Taioli, S. ^{[3
,4
,5
]}

Dora, B. ^{[6
]}

Farjam, M. ^{[7
]}

Fink, J. ^{[1
,8
]}

Marchenko, D. ^{[8
]}

Pichler, T. ^{[9
]}

Ziegler, K. ^{[10
]}

Simonucci, S. ^{[11
]}

Dresselhaus, M. S. ^{[12
,13
]}

Knupfer, M. ^{[1
]}

Buechner, B. ^{[1
]}

Grueneis, A. ^{[1
,9
]}

机构：

[1] IFW Dresden, D-01171 Dresden, Germany

[2] Tech Univ Dresden, Inst Festkorperphys, D-01069 Dresden, Germany

[3] FBK CMM, Interdisciplinary Lab Computat Sci, I-38123 Trento, Italy

[4] Univ Trento, I-38123 Trento, Italy

[5] Univ Trent, Dept Phys, I-38100 Trento, Italy

[6] Budapest Univ Technol & Econ, Dept Phys, H-1111 Budapest, Hungary

[7] Inst Res Fundamental Sci IPM, Tehran, Iran

[8] Elektronenspeicherring BESSY II, Helmholtz Zentrum Berlin Mat & Energie, D-12489 Berlin, Germany

[9] Univ Vienna, Fac Phys, A-1090 Vienna, Austria

[10] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany

[11] Univ Camerino, Dept Phys, I-62032 Camerino, Italy

[12] MIT, Dept Phys, Cambridge, MA 02139 USA

[13] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

来源：

NANO LETTERS | 2010年 / 10卷 / 09期

基金：

匈牙利科学研究基金会;

关键词：

Graphene; hydrogenation; photoemission; X-ray absorption; hydrogen storage; GENERATED CARBON-FILMS; ELECTRONIC-PROPERTIES; ATOMIC-STRUCTURE;

D O I：

10.1021/nl101066m

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We show by angle-resolved photoemission spectroscopy that a tunable gap in quasi-free-standing monolayer graphene on Au can be induced by hydrogenation. The size of the gap can be controlled via hydrogen loading and reaches similar to 1.0 eV for a hydrogen coverage of 8%. The local rehybridization from sp(2) to sp(3) in the chemical bonding is observed by X-ray photoelectron spectroscopy and X-ray absorption and allows for a determination of the amount of chemisorbed hydrogen. The hydrogen induced gap formation is completely reversible by annealing without damaging the graphene. Calculations of the hydrogen loading dependent core level binding energies and the spectral function of graphene are in excellent agreement with photoemission experiments. Hydrogenation of graphene gives access to tunable electronic and optical properties and thereby provides a model system to study hydrogen storage in carbon materials.

引用

页码：3360 / 3366

页数：7

共 48 条

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