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Indentation Response of Nanostructured Turfs

Published online by Cambridge University Press:  01 February 2011

A. A. Zbib ,
S. Dj. Mesarovic ,
D. F. Bahr ,
E. T. Lilleodden ,
J. Jiao  and
D. McClain
A. A. Zbib
Affiliation:
azbib@wsu.edu, Washington State University, Mechanical and Materials Engineering, PO Box 642920, Pullman, WA, 99164-2920, United States
S. Dj. Mesarovic
Affiliation:
smesarovic@wsu.edu, Washington State University, Mechanical and Materials Engineering, PO Box 642920, Pullman, WA, 99164-2920, United States
D. F. Bahr
Affiliation:
dbahr@wsu.edu, Washington State University, Mechanical and Materials Engineering, PO Box 642920, Pullman, WA, 99164-2920, United States
E. T. Lilleodden
Affiliation:
Erica.Lilleodden@gkss.de, GKSS, Geesthacht, N/A, Germany
J. Jiao
Affiliation:
jiaoj@pdx.edu, Portland State University, Physics, Portland, OR, 97207-0751, United States
D. McClain
Affiliation:
dmclain@pdx.edu, Portland State University, Physics, Portland, OR, 97207-0751, United States
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Abstract

When grown via chemical vapor deposition carbon nanotubes (CNTs) may take on the form of a “turf”, consisting of many CNTs with a complex interconnectedness attached to an inflexible substrate. These turfs can be formed over large areas and with a range of heights (between 1 to 100 μm), and grown on photolithographically patterned catalysts to form different aspect ratios. This study focuses on the indentation and permanent deformation of CNT assemblages under applied contact loading. Nanoindentation was conducted on CNT turfs and the properties, nominally the turf's elastic modulus and hardness, were 14.9 MPa ± 5.7 MPa and 2 MPa respectively. The onset of permanent deformation during indentation occurred at applied stresses of 2.5 MPa. The turf's collective permanent deformation under applied compressive loading was also studied. A model predicting the buckling stress of CNT turfs is also described.

Keywords

nanoscalehardnesselastic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1049: Symposium AA – Fundamentals of Nanoindentation and Nanotribology IV , 2007 , 1049-AA02-08
Copyright
Copyright © Materials Research Society 2008

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