Buckling initiation and displacement dependence in compression of vertically aligned carbon nanotube arrays

Changhong Cao, Alex Reiner, Chunhui Chung, Shuo Hung Chang, Imin Kao, Robert V. Kukta, Chad S. Korach

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Carbon nanotube (CNT) arrays have shown the remarkable ability to react as foam-like structures and exhibit localized buckling coordinated within specific regions. Here, we report on the low-cycle compression of bulk vertically aligned CNT arrays to observe initiation and growth of the buckling as a function of compressive strain. A critical strain is found above which the buckling region length increased and below which it remained at or below the applied strain. As previously observed, the buckling region of the CNT array propagates from the surface where growth occurred, which, in the test specimen, is a free surface and later receives compressive contact by a polished silicon substrate. The results are corroborated with nanoindentation on the surfaces, which indicate a stiffening of the near surface with increasing applied strain. Observation and results of the buckling region nature are important for applications of nanotube arrays as energy absorbing cushions, tunable dampers, thermal contacts, or in sliding contact.

Original languageEnglish
Pages (from-to)3190-3199
Number of pages10
JournalCarbon
Volume49
Issue number10
DOIs
Publication statusPublished - 2011 Aug 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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