Controlling the distribution of carbon nanotubes with colloidal masks: large-area patterning of carbon nanotube ring arrays.

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dc.contributor.author Motavas, Saloome
dc.date.accessioned 2009-04-29T18:03:12Z
dc.date.available 2009-04-29T18:03:12Z
dc.date.copyright 2008 en
dc.date.issued 2009-04-29T18:03:12Z
dc.identifier.uri http://hdl.handle.net/1828/1384
dc.description.abstract Carbon nanotubes (CNTs) are nanometer-scale structures that have attracted broad interest due to their exceptional thermal, electronic, and mechanical properties. As a result, there has been a large effort to develop applications of these materials in various fields including nanoelectronics and nanophotonics, energy storage, and biomedical fields. However, controlled production and manufacturing of CNTs still remains a challenge. In this work we demonstrate a method for controlling the placement and distribution of carbon nanotubes on surfaces using colloidal lithography. CNTs in ring-like geometries display interesting properties due to their nanoscale curved structure. Although several methods have been introduced for the fabrication of these structures, large scale fabrication of CNT rings with controllable diameter in a practical manner has thus far been elusive. Here, we use colloidal lithography to assemble nanotubes from solution into rings with tunable diameter and controllable placement in large-area periodic arrays. Several parameters and conditions such as the mask size, concentration and type of solvent for the CNT solutions are tested, and nanotubes with different quality and purity are used. Characterization of the CNT ring arrays using scanning electron microscopy (SEM) and atomic force microscopy (AFM) are performed. These results demonstrate large periodic areas of rings with good uniformity throughout the arrays. The arrays consist of rings with diameters between 180–220 nm when using 780 nm diameter sphere colloidal masks. Analysis of ring thickness for these rings indicated their cross-sections are composed of approximately 10-15 individual tubes. Rings made with 450 nm spheres had diameters between 100-150 nm, showing the tunability of the ring diameter enabled by our method. In some cases, mesh-like structures in the form of periodic interconnected carbon nanotubes were also observed. Our results demonstrate an efficient and straightforward approach for patterning carbon nanotubes into well-defined surface distributions with controlled and tunable dimensions. en
dc.language English eng
dc.language.iso en en
dc.rights Available to the World Wide Web en
dc.subject nanotubes en
dc.subject CNTs en
dc.subject colloidal en
dc.subject lithography en
dc.subject.lcsh UVic Subject Index::Sciences and Engineering::Engineering en
dc.title Controlling the distribution of carbon nanotubes with colloidal masks: large-area patterning of carbon nanotube ring arrays. en
dc.type Thesis en
dc.contributor.supervisor Papadopoulos, Christo
dc.degree.department Dept. of Electrical and Computer Engineering en
dc.degree.level Master of Applied Science M.A.Sc. en

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