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Issue 27, 2013
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Measurement of carbon nanotube microstructure relative density by optical attenuation and observation of size-dependent variations

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Abstract

Engineering the density of carbon nanotube (CNT) forest microstructures is vital to applications such as electrical interconnects, micro-contact probes, and thermal interface materials. For CNT forests on centimeter-scale substrates, weight and volume can be used to calculate density. However, this is not suitable for smaller samples, including individual microstructures, and moreover does not enable mapping of spatial density variations within the forest. We demonstrate that the relative mass density of individual CNT microstructures can be measured by optical attenuation, with spatial resolution equaling the size of the focused spot. For this, a custom optical setup was built to measure the transmission of a focused laser beam through CNT microstructures. The transmittance was correlated with the thickness of the CNT microstructures by Beer–Lambert–Bouguer law to calculate the attenuation coefficient. We reveal that the density of CNT microstructures grown by CVD can depend on their size, and that the overall density of arrays of microstructures is affected significantly by run-to-run process variations. Further, we use the technique to quantify the change in CNT microstructure density due to capillary densification. This is a useful and accessible metrology technique for CNTs in future microfabrication processes, and will enable direct correlation of density to important properties such as stiffness and electrical conductivity.

Graphical abstract: Measurement of carbon nanotube microstructure relative density by optical attenuation and observation of size-dependent variations

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Article information


Submitted
03 Apr 2013
Accepted
23 May 2013
First published
24 May 2013

Phys. Chem. Chem. Phys., 2013,15, 11511-11519
Article type
Paper

Measurement of carbon nanotube microstructure relative density by optical attenuation and observation of size-dependent variations

S. J. Park, A. J. Schmidt, M. Bedewy and A. John Hart, Phys. Chem. Chem. Phys., 2013, 15, 11511
DOI: 10.1039/C3CP51415C

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