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Shell buckling of individual multiwalled carbon nanotubes using nanoindentation
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View: Figures


Image of FIG. 1.
FIG. 1.

Sample images. (a) Transmission electron microscopy image of multiwalled carbon nanotubes used in the experiments. The image shows two nanotubes, the diameter of each is indicated with a double arrow. The wall thickness is estimated to be 5 nm. (b) Scanning electron microscopy image of the top (plan) view of ordered nanotube array used in experiments.

Image of FIG. 2.
FIG. 2.

Nanoindentation of individual carbon nanotubes. (a) Schematic illustration of the experiment in which a Berkovich indenter with 100 nm tip radius vertically compresses a multiwalled carbon nanotube. (b) Schematic illustration of shell buckling in nanotubes. (c) An in situ scanning image of the sample surface obtained immediately after compressing a nanotube.

Image of FIG. 3.
FIG. 3.

Representative load-displacement data from a loading-unloading cycle. (a) Displacement-controlled indent on a 100 nm long nanotube, (b) load-controlled indent on a 100 nm long nanotube, and (c) load-controlled indent on a 50 nm long nanotube. In all cases, buckling, evident by a distinct drop in slope, occurs between . The critical buckling load was repeatable to within between experiments.

Image of FIG. 4.
FIG. 4.

Buckled nanotube images. (a) Schematic illustration of a radius sphere indenting the nanotubes. (b) Scanning electron micrograph of the top view of a population of compressed nanotubes. (c) A magnified view of the buckled nanotubes showing distorted cross sections and deformed and wrinkled sidewalls.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Shell buckling of individual multiwalled carbon nanotubes using nanoindentation