Laser-induced disassembly of a graphene single crystal into a nanocrystalline network

被引：200

作者：

Krauss, B. ^{[1
]}

Lohmann, T. ^{[1
]}

Chae, D. -H. ^{[1
]}

Haluska, M. ^{[1
]}

von Klitzing, K. ^{[1
]}

Smet, J. H. ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 16期

关键词：

adsorbed layers; atomic force microscopy; bonds (chemical); decomposition; graphene; laser beam effects; nanostructured materials; Raman spectra; RAMAN-SPECTROSCOPY; GRAPHITE; SPECTRA; IMPURITIES; SCATTERING; DISORDER; CARBON; FILMS;

D O I：

10.1103/PhysRevB.79.165428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report about investigations of time-dependent structural modifications in single-crystal graphene due to laser irradiation even at moderate power levels of 1 mW in a diffraction-limited spot. The modifications have been characterized by in situ scanning confocal Raman spectroscopy, atomic force height microscopy, and transport studies. The time evolution of the Raman spectrum reveals two different effects: on a short-time scale, dopants, initially present on the flake, are removed. The longer time scale behavior points to a laser induced gradual local decomposition of single-crystal graphene into a network of interconnected nanocrystallites with a characteristic length scale of approximately 10 nm due to bond breaking. The broken bonds offer additional docking sites for adsorbates as confirmed in transport and AFM height studies. These controlled structural modifications may for instance be valuable for enhancing the local reactivity, trimming graphene based gas sensors and generating spatially varying doping patterns.

引用

页数：9

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