Imaging local electronic corrugations and doped regions in graphene

被引：101

作者：

Schultz, Brian J. ^{[2
]}

Patridge, Christopher J. ^{[2
]}

Lee, Vincent ^{[2
]}

Jaye, Cherno ^{[3
]}

Lysaght, Patrick S. ^{[4
]}

Smith, Casey ^{[4
]}

Barnett, Joel ^{[4
]}

Fischer, Daniel A. ^{[3
]}

Prendergast, David ^{[1
]}

Banerjee, Sarbajit ^{[2
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Mol Foundry, Berkeley, CA 94720 USA

[2] SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA

[3] Natl Inst Stand & Technol, Mat Measurement Lab, Gaithersburg, MD 20899 USA

[4] SEMATECH, Front End Proc Div, Austin, TX 78741 USA

来源：

NATURE COMMUNICATIONS | 2011年 / 2卷

基金：

美国国家科学基金会;

关键词：

X-RAY-ABSORPTION; FINE-STRUCTURE; CARBON NANOTUBES; GRAPHITE; SPECTROSCOPY; FILMS;

D O I：

10.1038/ncomms1376

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Electronic structure heterogeneities are ubiquitous in two-dimensional graphene and profoundly impact the transport properties of this material. Here we show the mapping of discrete electronic domains within a single graphene sheet using scanning transmission X-ray microscopy in conjunction with ab initio density functional theory calculations. Scanning transmission X-ray microscopy imaging provides a wealth of detail regarding the extent to which the unoccupied levels of graphene are modified by corrugation, doping and adventitious impurities, as a result of synthesis and processing. Local electronic corrugations, visualized as distortions of the pi*cloud, have been imaged alongside inhomogeneously doped regions characterized by distinctive spectral signatures of altered unoccupied density of states. The combination of density functional theory calculations, scanning transmission X-ray microscopy imaging, and in situ near-edge X-ray absorption fine structure spectroscopy experiments also provide resolution of a longstanding debate in the literature regarding the spectral assignments of pre-edge and interlayer states.

引用

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