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Mechanical behavior of ultralong multiwalled carbon nanotube mats
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Image of FIG. 1.
FIG. 1.

Schematic of furnace and reactant introduction assembly used for CVD.

Image of FIG. 2.
FIG. 2.

SEM stage attachment: either the blade attachment (a) or a load cell attachment (b) can be used. Sample is held at (c) with rotation and two-axis motion control independent of blade/load cell attachment.

Image of FIG. 3.
FIG. 3.

Cutting sequence, arrows show sample movement. (a) Sample is positioned at desired location and moved into blade. (b) Sample is pulled away from blade, sectioning off a portion of the CNT mat. (c) Example of final cut sample.

Image of FIG. 4.
FIG. 4.

tall, well-aligned mat of carbon nanotubes grown with vapor-phase CVD, scale bars is .

Image of FIG. 5.
FIG. 5.

Average carbon nanotube compressive stress-strain response in both parallel and perpendicular orientations.

Image of FIG. 6.
FIG. 6.

Average nanotube tensile stress-strain response, TMA tests.

Image of FIG. 7.
FIG. 7.

(a) SEM micrograph of CNT mat showing low tube density and tube spacing. (b) TEM micrograph showing tube inner and outer diameter variations.

Image of FIG. 8.
FIG. 8.

Comparison of strain calculated from micrometer position and strain measured directly from nanotube mat sample, tension tests.

Image of FIG. 9.
FIG. 9.

In situ carbon nanotube tension and compression stress-strain results (stresses corrected for actual area).

Image of FIG. 10.
FIG. 10.

Time-dependent response of nanotube mats; in the tension test, each strain step is strain, in compression, each strain step is .

Image of FIG. 11.
FIG. 11.

Strain recovery in carbon nanotube mats between compression tests, values next to data points indicate% strain recovered from previous test.

Image of FIG. 12.
FIG. 12.

Large-scale buckling of carbon nanotube mats observed in compression tests.

Image of FIG. 13.
FIG. 13.

(a) SEM micrograph of glue failure. (b) Micrograph of nanotube mat after failure under tensile loading ( scale bars).

Image of FIG. 14.
FIG. 14.

Failure surface of CNT mat, showing loose nanotube ends caused by nanotube slip and pullout ( scale bars).

Image of FIG. 15.
FIG. 15.

[(a)–(c)] Maxwell stress relaxation fit plots for tension, compression, and unloading. (d) relaxation modulus plotted against strain for two compression tests.


Generic image for table
Table I.

Summary of modulus results for nanotube mats. Corrected in situ results have been adjusted to remove stress relaxation effect. Stress relaxation is presented for in situ results with incremental strain steps only; relaxation data have been corrected for the small relaxation due to equipment used.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mechanical behavior of ultralong multiwalled carbon nanotube mats