Carbon nanotubes as piezoresistive microelectromechanical sensors: Theory and experiment
Author(s)Culpepper, Martin Luther; Cullinan, Michael Arthur
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Carbon-nanotube (CNT) -based strain sensors have the potential to overcome some of the limitations in small-scale force/displacement sensing technologies due to their small size and high sensitivity to strain. A better understanding of the dominant and limiting causes of high strain sensitivity is needed to enable the design and manufacture of high-performance sensor systems. This paper presents the theoretical framework that makes it possible to predict the strain sensitivity of a carbon nanotube based on it chiral indices (n,m). This framework is extended to capture the behavior of sensors composed of multiple CNTs in a parallel resistor network. This framework has been used to predict that a parallel resistor network of more than 100 randomly selected CNTs should have a gauge factor of approximately 78.5±0.4. This is within the experimental error of the measured gauge factor of 75±5 for such CNT resistor networks.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
Physical Review B
American Physical Society
Cullinan, Michael A., and Martin L. Culpepper. “Carbon nanotubes as piezoresistive microelectromechanical sensors: Theory and experiment.” Physical Review B 82.11 (2010): 115428. © 2010 The American Physical Society.
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