In situ SEM Observation of Column-like and Foam-like CNT Array Nanoindentation
Abstract
Quantitative nanoindentation of nominally 7.5 and 600 micro m tall vertically aligned carbon nanotube (VACNT) arrays is observed in situ within an SEM chamber. The 7.5 micro 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 micro 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%.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 02, 2011
- Accession Number
- ADA578764
Entities
People
- Feng Du
- Jeffery W Baur
- Liming Dai
- Matthew R Maschmann
- Qiuhong Zhang
- Robert W. Wheeler
Organizations
- Air Force Research Laboratory