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Published July 19, 2011 | public
Journal Article Open

Reversible Tuning of the Wettability of Carbon Nanotube Arrays: The Effect of Ultraviolet/Ozone and Vacuum Pyrolysis Treatments


Among diverse types of synthetic materials, arrays of vertically aligned carbon nanotubes have attracted the most attention, mainly because of their exceptional mechanical, electrical, optical, and thermal properties. However, their wetting properties are yet to be understood. In this present study, oxygenated surface functional groups have been identified as a vital factor in controlling the wetting properties of carbon nanotube arrays. The results presented herein indeed show that a combination of ultraviolet/ozone and vacuum pyrolysis treatments can be used to vary the surface concentration of these functional groups such that the carbon nanotube array can be repeatedly switched between hydrophilic and hydrophobic.

Additional Information

© 2011 American Chemical Society. Received: May 16, 2011. Revised: June 10, 2011. Published: June 14, 2011. Publication Date (Web): June 14, 2011. This work was supported by The Charyk Foundation, The Fletcher Jones Foundation under grant number 9900600 and The Office of Naval Research under grant number N00014-11-1-0031. A. I. Aria was supported by a Fulbright Scholarship. The authors acknowledge the Kavli Nanoscience Institute at the California Institute of Technology for use of the nanofabrication instruments, the Molecular Materials Research Center of the Beckman Institute at the California Institute of Technology for use of the FTIR, XPS, and contact angle goniometer, and the Analytical Facility Division of Geological and Planetary Sciences of the California Institute of Technology for use of SEM/EDS. The authors also gratefully acknowledge Prof. George Rossman for giving access to the Raman spectrometer and Dr. Masoud Beizai for valuable discussion in interpreting the FTIR spectra.

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Supplemental Material - la201841m_si_001.pdf


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August 19, 2023
August 19, 2023