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Laser induced non-thermal deposition of ultrathin graphite

 
: Reininghaus, M.; Wortmann, D.; Finger, J.; Faley, O.; Poprawe, R.; Stampfer, C.

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Applied Physics Letters 100 (2012), Nr.15, Art. 151606, 3 S.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
Englisch
Zeitschriftenaufsatz
Fraunhofer ILT ()

Abstract
We present a laser induced ablation process to fabricate ultrathin graphitic flakes. By varying the fluence of the ablating pulsed fs-laser radiation, we identify distinct values for "thermal" evaporation and so-called "non-thermal" ablation of graphitic flakes. The presence of the non-thermal ablation is a direct consequence of the strong asymmetry of the bonding strength in normal and in-plane direction in layered materials, such as graphite. The experimentally extracted non-thermal ablation threshold for graphite of 250 mJ/cm 2 agrees well with theoretical predictions. Finally, we deposited ultrathin graphitic flakes of 50 m 2 in size, which we characterize by Raman spectroscopy and scanning force microscopy.

: http://publica.fraunhofer.de/dokumente/N-206693.html