Advanced Three-Dimensional Structural Carbon Nanomaterials

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dc.contributor.advisorAjayan, Pulickel M.en_US
dc.creatorOzden, Sehmusen_US
dc.date.accessioned2017-07-26T20:20:52Zen_US
dc.date.available2017-07-26T20:20:52Zen_US
dc.date.created2016-12en_US
dc.date.issued2016-08-17en_US
dc.date.submittedDecember 2016en_US
dc.date.updated2017-07-26T20:20:53Zen_US
dc.description.abstractCarbon nanomaterials, such as carbon nanotubes (CNTs) and graphene, are most intensively investigated carbon allotropes because of their outstanding physical and chemical properties. Recently, it has been realized that threedimensional (3D) carbon-based structures with nanoscale interconnection provide the remarkably improved properties required for critically needed applications. The properties of 3D-CNTs and graphene architectures can be tweaked for various applications. Therefore, 3D carbon-based solids with nanoscale intermolecular junctions present an exciting research area and provide opportunities for fabrication of various 3D-macroscopic architectures with unexpected properties. The creation of nanoengineered 3D-macroscopic structures in a scalable synthetic process still remains a challenge. The fundamental problem is the difficulty in introducing atomic-scale junctions between individual nanoscale structures so that they can be organized as covalently interconnected nanostructured networks with controllable physical characteristics, such as density and porosity. Here, 3D structures have been created using chemical vapor deposition method, solutionbased chemistry technique and welding method via hypervelocity impact method to generate atomic-scale junction between carbon nanostructures. The scalable fabrication of 3D macroscopic scaffolds with different hierarchical interconnected structures and soldering-like junctions between CNTs using chemical vapor deposition (CVD) technique is reported. These intermolecular junctions of CNTs result in a high thermal stability, high electrical conductivity, excellent mechanical properties, as well as excellent structural stability in a concentrated acid, base, and organic solvents. The CNT solids with such tremendous properties represent the next generation of carbon-based materials with a broad range of potential applications; we demonstrate here a couple such utility impact damping, removal oil from contaminated water and as a marker for the oil industry. Additionally, in situ nano-indentation inside a scanning electron microscopy (SEM) were used to determine the mechanical response of individual covalent junction, formed in different configurations such as “X”, “Y” and “” shapes between individual CNTs. Fully atomistic reactive molecular dynamics simulations are used to support the experimental results as well as to study the deformation behavior of junctions. Vertically aligned multiwall carbon nanotube forests (NTF) synthesized by water assisted CVD method and both sides functionalized with different functionalities as hydrophobic and hydrophilic. The produced hygroscopic nanotube forest demonstrate for water harvesting from air. The second approach has been used in this work is solution chemistry to generate crosslinking nanotube structures. The scalable synthesis of 3D macroscopic solids made of covalently connected nanotubes via Suzuki cross-coupling reaction, a well-known carbon-carbon covalent bond forming reaction in organic chemistry. The resulting CNTs solids are made of highly porous, interconnected structures made of chemically crosslinked carbon nanotubes after freeze-drying process. CNTs solids demonstrated one such utility in the removal of oil from contaminated water. In another approach hypervelocity impact method was used to investigate mechanical behavior of CNTs. The hypervelocity impact of CNT bundles against metallic targets resulted their unzipping along the tube axis, which leads to the formation of graphene nanoribbons, nanodiamonds and covalently interconnected carbon nanostructures depending on the velocity and impact geometry. This new process can produce chemical-free, high-quality graphene nanoribbons. The experimental results supported by fully atomistic reactive molecular dynamics simulations were used to gain further insights of the pathways and deformation and fracture mechanismsen_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationOzden, Sehmus. "Advanced Three-Dimensional Structural Carbon Nanomaterials." (2016) Diss., Rice University. <a href="https://hdl.handle.net/1911/95520">https://hdl.handle.net/1911/95520</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/95520en_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.subjectNanotubesen_US
dc.subjectCarbonen_US
dc.subjectThree-Dimensionalen_US
dc.subjectMechanical propertiesen_US
dc.subjectWater harvestingen_US
dc.subjectFunctionalizationen_US
dc.subjectUnzippingen_US
dc.subjectHigh impacten_US
dc.subjectUnzipping Mechanismen_US
dc.subjectStiffnessen_US
dc.subjectIntermolecular junctionsen_US
dc.subject3D CNT solidsen_US
dc.subjectCarbon nanotube junctionen_US
dc.subjectpicoindentationen_US
dc.subjectin situ testingen_US
dc.subjectatomistic modelingen_US
dc.subjectoil-water separationen_US
dc.subjectchemical cross-linkingen_US
dc.subjectSuzuki reactionen_US
dc.titleAdvanced Three-Dimensional Structural Carbon Nanomaterialsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentMaterials Science and NanoEngineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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