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Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

Aria, Adrianus Indrat and Gharib, Morteza (2013) Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays. Journal of Visualized Experiments - Applied Physics, 74 . Art. No. e50378. ISSN 1940-087X. https://resolver.caltech.edu/CaltechAUTHORS:20130516-084945631

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Abstract

In this article, we describe a simple method to reversibly tune the wetting properties of vertically aligned carbon nanotube (CNT) arrays. Here, CNT arrays are defined as densely packed multi-walled carbon nanotubes oriented perpendicular to the growth substrate as a result of a growth process by the standard thermal chemical vapor deposition (CVD) technique. These CNT arrays are then exposed to vacuum annealing treatment to make them more hydrophobic or to dry oxidation treatment to render them more hydrophilic. The hydrophobic CNT arrays can be turned hydrophilic by exposing them to dry oxidation treatment, while the hydrophilic CNT arrays can be turned hydrophobic by exposing them to vacuum annealing treatment. Using a combination of both treatments, CNT arrays can be repeatedly switched between hydrophilic and hydrophobic. Therefore, such combination show a very high potential in many industrial and consumer applications, including drug delivery system and high power density supercapacitors. The key to vary the wettability of CNT arrays is to control the surface concentration of oxygen adsorbates. Basically oxygen adsorbates can be introduced by exposing the CNT arrays to any oxidation treatment. Here we use dry oxidation treatments, such as oxygen plasma and UV/ozone, to functionalize the surface of CNT with oxygenated functional groups. These oxygenated functional groups allow hydrogen bond between the surface of CNT and water molecules to form, rendering the CNT hydrophilic. To turn them hydrophobic, adsorbed oxygen must be removed from the surface of CNT. Here we employ vacuum annealing treatment to induce oxygen desorption process. CNT arrays with extremely low surface concentration of oxygen adsorbates exhibit a superhydrophobic behavior.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://www.ncbi.nlm.nih.gov/pubmed/23629482PubMed CentralUNSPECIFIED
http://dx.doi.org/10.3791/50378 DOIUNSPECIFIED
http://www.jove.com/video/50378/dry-oxidation-vacuum-annealing-treatments-for-tuning-wettingPublisherUNSPECIFIED
Additional Information:© 2013 JoVE. This work was supported by The Charyk Foundation and The Fletcher Jones Foundation under grant number 9900600. The authors gratefully 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 XPS and contact angle goniometer, and the Division of Geological and Planetary Sciences of the California Institute of Technology for use of SEM.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Charyk Foundation UNSPECIFIED
Fletcher Jones Foundation 9900600
Subject Keywords:Chemistry, Chemical Engineering, Materials Science, Nanotechnology, Engineering, Nanotubes, Carbon, Oxidation-Reduction, Surface Properties, carbon nanotubes (synthesis and properties), Carbon nanotube, Wettability, Hydrophobic, Hydrophilic, UV/ozone, Oxygen Plasma, Vacuum Annealing
Record Number:CaltechAUTHORS:20130516-084945631
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130516-084945631
Official Citation:Aria, A. I., Gharib, M. Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays. J. Vis. Exp. (74), e50378, doi:10.3791/50378 (2013).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38534
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 May 2013 16:29
Last Modified:03 Oct 2019 04:58

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