Physics – Condensed Matter – Materials Science
Scientific paper
2008-12-04
Phys. Rev. B 79, 165428 (2009)
Physics
Condensed Matter
Materials Science
16 pages, 4 figures
Scientific paper
10.1103/PhysRevB.79.165428
We report about investigations of time-dependent structural modifications in single crystal graphene due to laser irradiation even at moderate power levels of 1mW in a diffraction limited spot. The structural 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 nano-crystallites 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 and trimming graphene based gas sensors.
Chae Dong-Hun
Haluska Miroslav
Klitzing Klaus von
Krauss Benjamin
Lohmann Timm
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