Electronic properties of hydrogenated quasi-free-standing graphene

被引：19

作者：

Haberer, D. ^{[1
]}

Petaccia, L. ^{[2
]}

Wang, Y. ^{[3
]}

Quian, H. ^{[3
]}

Farjam, M. ^{[4
]}

Jafari, S. A. ^{[4
,5
]}

Sachdev, H. ^{[6
,7
]}

Federov, A. V. ^{[8
]}

Usachov, D. ^{[8
]}

Vyalikh, D. V. ^{[8
,9
]}

Liu, X. ^{[10
]}

Vilkov, O. ^{[8
,9
]}

Adamchuk, V. K. ^{[8
]}

Irle, S. ^{[3
]}

Knupfer, M. ^{[1
]}

Buechner, B. ^{[1
]}

Grueneis, A. ^{[1
,10
]}

机构：

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

[2] Sincrotrone Trieste SCpA, Elettra Synchrotron Light Lab, I-34149 Trieste, Italy

[3] Nagoya Univ, Dept Chem, Chikusa Ku, Nagoya, Aichi 4648602, Japan

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

[5] Sharif Univ Technol, Dept Phys, Tehran 111559161, Iran

[6] Univ Saarland, D-66041 Saarbrucken, Germany

[7] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

[8] St Petersburg State Univ, St Petersburg 198504, Russia

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

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

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2011年 / 248卷 / 11期

基金：

日本科学技术振兴机构;

关键词：

functionalization; graphene; hydrogen; photoemission spectroscopy; MONOLAYER; NI(111); CARBON;

D O I：

10.1002/pssb.201100521

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Tailoring the electronic properties of graphene is of fundamental interest regarding its application in electronic devices. One of the key strategies is chemical functionalization which modifies the pi-electron system and thus can induce band gaps. However, in order to control the degree of functionalization it is crucial to know the exact amount of the chemisorbed species. We show with angle-resolved photoemission spectroscopy (ARPES) the formation of a band gap in graphene and estimate the hydrogen coverage from the scattering rate. Using X-ray photoemission spectroscopy (XPS) we identify the chemical environments in hydrogenated graphene and determine the total hydrogen to carbon (H/C)-ratio directly from the spectra. We then compare ARPES and XPS as tools for determining the H/C-ratio and discuss the results from molecular dynamics (MD) simulations. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2639 / 2643

页数：5

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