Thermal analysis of carbon nanotube film irradiated by a pulsed laser
Thermal analysis of carbon nanotube film irradiated by a pulsed laser
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DOI：
10.1016/j.cap.2007.10.056
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发表时间：
2008-05-01
影响因子：
2.4
通讯作者：
Tsuda, Ryoichi
中科院分区：
文献类型：
--
作者：
Nakamlya, Toshlyuki;Ueda, Tsuyoshi;Tsuda, Ryoichi
将制备的多壁碳纳米管(MWCNTs)薄膜安装在支架上，在空气中用单一脉冲的NdYAG光(波长=532 nm)或脉冲KrF准分子激光(波长=248 nm)对薄膜表面进行闪光。通过观察表面形貌，测量了表面损伤的阈值能量密度。通过求解一维热传导方程，模拟了脉冲纳秒激光加热过程的动力学过程。采用有限元方法对该方程进行求解。脉冲激光对多壁碳纳米管薄膜的损伤阈值能量密度分别为650mJ/cm(2)和790mJ/cm(2)。当激光能量密度为790mJ/cm(2)时，表面温度在13 ns处达到最高温度913℃。此外，还测量了辐照前后多壁碳纳米管薄膜的拉曼光谱。辐照超过表面损伤阈值后，样品发生石墨化。(C)2007 Elsevier B.V.保留所有权利。
The prepared multi-walled carbon nanotubes (MWCNTs) film was mounted on the holder and the film surface was flashed with a single pulse of Nd:YAG laser (lambda = 532 nm) or a pulsed KrF excimer laser (lambda = 248 nm) in the air. The threshold energy density for surface damage was measured by inspecting the surface morphology. The dynamics of pulsed nanosecond laser heating process was simulated by the solution of the one-dimensional heat conduction equation. The finite element method (FEM) was applied to solve the equation. The damage threshold energy density for MWCNTs films flashed by a pulsed Nd:YAG laser were in the range 650 mJ/cm(2) and 790 mJ/cm(2). At the laser fluence of 790 mJ/cm(2) with Nd:YAG laser, the surface reached the maximum temperature 913 degrees C at 13 ns. Moreover, the Raman spectroscopy of MWCNTs films before and after irradiation were measured. Graphitization occurred on the sample after irradiation over the threshold energy of surface damage. (c) 2007 Elsevier B.V. All rights reserved.