Wafer-scale Films and Devices of Spontaneously Aligned Carbon Nanotubes

Simple item page
dc.contributor.advisorKono, Junichiroen_US
dc.creatorGao, Weiluen_US
dc.date.accessioned2017-07-31T15:14:53Zen_US
dc.date.available2017-08-01T05:01:03Zen_US
dc.date.created2016-08en_US
dc.date.issued2016-06-06en_US
dc.date.submittedAugust 2016en_US
dc.date.updated2017-07-31T15:14:54Zen_US
dc.description.abstractOne of the grand challenges in nanoscience and nanotechnology is how to create macroscopic devices by assembling nano-objects while preserving their extraordinary properties. For example, individual single-wall carbon nanotubes (SWCNTs) possess unique one-dimensional properties that have stimulated much interest in diverse disciplines, and worldwide efforts are in progress to produce large-scale architectures of aligned SWCNTs. Various methods have been proposed and/or demonstrated, including both direct-growth and post-growth schemes, but the current state of this field is that there is still no method available for producing large-area single-domain films of highly aligned, densely packed and chirality-enriched SWCNTs. In this thesis, we describe a new process of controlled differential pressure filtration (CDPF) for producing a wafer-scale (i.e., inch-size) film of aligned SWCNTs. This method works for SWCNTs synthesized by various methods and can be scaled up in three dimensions (i.e., in lateral size and thickness). We extensively characterized the produced large-area films with different microscopy, spectroscopy and transport methods to demonstrate perfect global alignment with extraordinary photonic and optoelectronic properties. We developed ideal terahertz/infrared polarizers using this approach. The strikingly high degree of alignment with nematic order parameter (S) ~1 and the scalability with thickness ~ 100 nm distinguish CDPF from both existing two-dimensional (2D) and three-dimensional (3D) post-growth assembly techniques. We investigated the underlying mechanisms based on a proposed model of 2D confinement induced phase transition. We identified factors affecting the degree of alignment, including filtration speed, SWCNT concentration, surfactant concentration, hydrophilicity of the filter membrane, SWCNT length, and SWCNT diameter, in order to optimize filtration conditions for an optimally aligned film. Furthermore, by combining CDFP with well-developed solution-based chirality separation techniques (the gel chromatography and aqueous two phase extraction methods), we succeeded in producing chirality-enriched aligned films. The globally aligned chirality-enriched SWCNT films are promising for optoelectronic and electronic device applications. We demonstrated polarized luminescent devices, polarization-sensitive photodetectors, and anisotropic thin-film transistors using semiconducting SWCNTs. CDPF-produced SWCNT films will produce a range of new opportunities not only in fundamental research of physics, chemistry, and materials science but also applications in electronics, optoelectronics, sensing, imaging, and medicine.en_US
dc.embargo.terms2017-08-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationGao, Weilu. "Wafer-scale Films and Devices of Spontaneously Aligned Carbon Nanotubes." (2016) Diss., Rice University. <a href="https://hdl.handle.net/1911/95547">https://hdl.handle.net/1911/95547</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/95547en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectCarbon Nanotubesen_US
dc.subjectElectronic Devicesen_US
dc.subjectOptoelectronic Devicesen_US
dc.subjectMacroscopic Alignmenten_US
dc.titleWafer-scale Films and Devices of Spontaneously Aligned Carbon Nanotubesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
GAO-DOCUMENT-2016.pdf
Size:
7.25 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
PROQUEST_LICENSE.txt
Size:
5.84 KB
Format:
Plain Text
Description:
Download
No Thumbnail Available
Name:
LICENSE.txt
Size:
2.6 KB
Format:
Plain Text
Description:
Download
Collections
Rice University Theses and Dissertations