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Spatial Variations in the Mechanical Properties and Electrical Properties of Carbon Nanotube Turfs

Published online by Cambridge University Press:  01 February 2011

Anqi Qiu ,
Melinda Lopez ,
Aikaterini Bellou ,
Devon McClain ,
Jun Jiao  and
David Bahr
Anqi Qiu
Affiliation:
anqi_qiu@hotmail.com, Washington State University, Mechanical and Materials Engineering, Pullman, Washington, United States
Melinda Lopez
Affiliation:
lopez205@cougars.csusm.edu, Washington State University, Mechanical and Materials Engineering, Pullman, Washington, United States
Aikaterini Bellou
Affiliation:
abellou@mail.wsu.edu, Washington State University, Mechanical and Materials Engineering, Pullman, Washington, United States
Devon McClain
Affiliation:
dmcclain@pdx.edu, Portland State University, Physics, Portland, Oregon, United States
Jun Jiao
Affiliation:
jiaoj@pdx.edu, Portland State University, Physics, Portland, Oregon, United States
David Bahr
Affiliation:
dbahr@wsu.edu, Washington State University, Mechanical and Materials Engineering, Pullman, Washington, United States
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Abstract

The mechanical properties of arrays of nominally vertically aligned carbon nanotubes, often referred to as turfs, have been measured using nanoindentation and the electrical properties have been measured using electrical contact resistance (ECR) nanoindentation. The elastic properties do not vary significantly between the top and the bottom of the same carbon nanotube turf. Within a single turf the lateral spatial variation is less than 10% when volumes of μm's are probed with the indenter, indicating that each turf can be treated mechanically as continuum on this scale. The electrical properties vary significantly within a single turf on the same scale. This suggests that the use of average mechanical properties for a given vertically aligned turf should be suitable for design purposes without the need to account for spatial variation in structure, and variations in mechanical properties on the micrometer scale are not dependent on spatially distinct defects. However, local contact behavior appears to dominate the electrical behavior on this same length scale.

Keywords

elastic propertiesnano-indentationC
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1258: Symposia P/Q/R – Low-Dimensional Functional Nanostructures-Fabrication, Characterization and Applications , 2010 , 1258-R10-29
Copyright
Copyright © Materials Research Society 2010

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