垂直排列碳纳米管阵列的高度无关压缩模量

Height independent compressive modulus of vertically aligned carbon nanotube arrays.

作者信息

Tong Tao, Zhao Yang, Delzeit Lance, Kashani Ali, Meyyappan M, Majumdar Arun

机构信息

Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA.

出版信息

Nano Lett. 2008 Feb;8(2):511-5. doi: 10.1021/nl072709a. Epub 2008 Jan 12.

DOI:10.1021/nl072709a

PMID:18189439

Abstract

The compressive modulus of dense vertically aligned multiwalled carbon nanotube (CNT) arrays synthesized by chemical vapor deposition was investigated using an optically probed precision-loading platform. For CNT arrays with heights ranging from 15 to 500 microm, the moduli were measured to be about 0.25 MPa and were found to be independent of array height. A continuum mechanics model based on multimode buckling guided by the wavy features of CNT arrays is derived and explains well the measured compressive properties. The measured compressive modulus of the CNT arrays also satisfies the "Dahlquist tack criterion" for pressure sensitive adhesives, which was previously observed for these vertically aligned CNT arrays (Zhao, Y., et al. J. Vac. Sci. Technol., B 2006, 24, 331-335).

摘要

使用光学探测精密加载平台研究了通过化学气相沉积法合成的致密垂直排列多壁碳纳米管（CNT）阵列的压缩模量。对于高度在15至500微米范围内的CNT阵列，测得的模量约为0.25兆帕，且发现其与阵列高度无关。推导了基于由CNT阵列的波浪特征引导的多模屈曲的连续介质力学模型，该模型很好地解释了测得的压缩特性。CNT阵列测得的压缩模量也满足压敏胶粘剂的“达尔奎斯特粘性标准”，之前在这些垂直排列的CNT阵列中也观察到了这一情况（Zhao, Y., 等人，《真空科学与技术杂志》，B辑，2006年，24卷，331 - 335页）。