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Thermal analysis of carbon nanotube film irradiated by a pulsed laser
Toshiyuki Nakamiya,Tsuyoshi Ueda,Tomoaki Ikegami,Kenji Ebihara,Ryoichi Tsuda 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
The prepared multi-walled carbon nanotubes (MWCNTs) lm was mounted on the holder and the lm surface was ashed with asingle pulse of Nd:YAG laser (k = 532 nm) or a pulsed KrF excimer laser (k face damage was measured by inspecting the surface morphology. The dynamics of pulsed nanosecond laser heating process was sim-ulated by the solution of the one-dimensional heat conduction equation. The nite element method (FEM) was applied to solve theequation. The damage threshold energy density for MWCNTs lms ashed by a pulsed Nd:YAG laser were in the range 650 mJ/cm2and 790 mJ/cm2. At the laser uence of 790 mJ/cm2 with Nd:YAG laser, the surface reached the maximum temperature 913.C a t13 ns. Moreover, the Raman spectroscopy of MWCNTs lms before and after irradiation were measured. Graphitization occurredon the sample after irradiation over the threshold energy of surface damage.