期刊
ACS APPLIED MATERIALS & INTERFACES
卷 3, 期 3, 页码 648-653出版社
AMER CHEMICAL SOC
DOI: 10.1021/am101262g
关键词
carbon nanotube; compression; indentation; buckling; in situ observation
资金
- Air Force Office of Scientific Research (AFOSR)
Quantitative nanoindentation of nominally 7.5 and 600 mu m tall vertically aligned carbon nanotube (VACNT) arrays is observed in situ within an SEM chamber. The 7.5 mu m array consists of highly aligned and weakly interacting CNTs and deflects similarly to classically defined cylindrical columns, with deformation geometry and critical buckling force well estimated using the Euler-Bernoulli theory. The 600 mu m array has a highly entangled foam-like morphology and exhibits sequential buckle formation upon loading, with a buckle first forming near the array bottom at approximately 2% strain, followed by accumulating coordinated buckling at the top surface at strains exceeding 5%.
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