Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 77 for “"Nanoribbons"”.
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Characterization, stability, and transport through defects in graphene nanoribbons
Graphene nanoribbons (GNRs) constitute a new class of nanostructured materials with unique properties and significant potential for applications. During production of GNRs, defects are generally introduced within the lattice. Assessment of defects' stability and characterization of their effects on …
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Properties of graphene nanoribbons obtained by chemical vapor deposition
… substrates, we pattern the film into graphene nanoribbons (GNRs) of width < ~50 nm and length < ~ 700 nm with Ti/Au contacts. We perform low-bias, high-bias, and temperature-dependent electrical measurements. CVD-grown GNRs have mobility values from 100 to 500 cm2V-1s-1 and current densities up …
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Scanning tunneling microscopy investigation of atomically precise graphene nanoribbons
… contact transfer of atomically precise graphene nanoribbons onto H:Si(100) under ultra-high vacuum, detailed electronic characterization, and electron-mediated polymerization of graphene nanoribbon precursors into polyanthrylene. Detailed scanning tunneling microscopy (STM) and scanning tunneling …
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A study on the properties of graphene nanoribbons for electronics
… that a size-dependent bandgap opens for graphene nanoribbons with widths below around 40 nm. To date, photo- and electron-beam lithography (PL & EBL, respectively) have routinely been used to etch graphene to fabricate graphene nanoribbons with sizes down to around 15 nm. However, these processes …
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Electronic characterization of solution-synthesized graphene nanoribbons using scanning tunneling microscopy
… to fabricate atomically precise graphene nanoribbons (GNRs). Previous works of on-surface heterojunction GNRs and the dry contact transfer method for solution-synthesized GNRs are presented to show the current status of GNR fabrication. The electronic characterizations of the chevron GNR …
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The Electrical Transport Study Of Graphene Nanoribbons And 2d Materials Beyond Graphene
… removes the impurities on the suspended graphene nanoribbons, uncovering the intrinsic ambipolar transfer characteristic of graphene. Further increasing the annealing current creates a narrow constriction in the ribbon, leading to the formation of a large band-gap and subsequent high on/off ratio …
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NICKEL HYDROXIDE NANORIBBONS FOR EFFICIENT WATER SPLITTING AND DIRECT METHANOL FUEL CELL
… the first stabilized non-stochiometric Ni(OH)2 nanoribbons (NR-Ni(OH)2) with alternating 4- and 6- coordinated Ni edge atoms. In OER applications, the NR-Ni(OH)2 exhibits remarkable OER catalytic activity with an overpotential of 162 mV at 10 mA cm-2, which is one of the best OER activity …
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Scanning tunneling microscopy characterization and metallic nanocontacts for atomically precise graphene nanoribbons
… material, atomically precise graphene nanoribbons (GNRs) have been predicted to show very interesting electronic properties based on their geometries and their underlying substrates. Once the ribbons are synthesized, confirmation of their geometries and investigating their electronic …
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Synthesis of guanidinium-functionalized amphiphiles for the exploration of chaotropic supramolecular nanoribbons
Nanoscale self-assembly driven by the hydrophobic effect is of intense research interest due to the ability to synthesize complex, chemically diverse structures with molecular length scales. Supramolecular self-assemblies comprised of amphiphilic molecules have been engineered to achieve diverse …
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Scanning tunneling microscopy and spectroscopy of wet chemical synthesized porous graphene nanoribbons in ultra-high vacuum
The student, Kaitlyn Parsons, accepted the attached license on 2018-06-29 at 12:21.
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Scanning tunneling microscopy and spectroscopy of wet chemically synthesized porous graphene nanoribbons on hydrogen passivated silicon (100)
… synthesized atomically precise porous graphene nanoribbons (GNRs) exfoliated onto hydrogen passivated silicon H:Si(100) substrates using a dry contact transfer (DCT) method under ultrahigh-vacuum (UHV) conditions. The porous GNRs are characterized in UHV using scanning tunneling microscopy (STM) …
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Scanning tunneling microscopy and spectroscopy of metallic features and nanocontacts for atomically precise graphene nanoribbons on silicon surface
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Hydrogenation of nanostructured carbon, synthesis of organic semiconductors and progress towards synthesis of fullerenes and nanoribbons from polyaromatic hydrocarbons
… into the formation of graphene nanoribbons from small molecules (bottom-up synthesis) was explored. By thermal annealing of substituted and unsubstituted pentacenes, large polymeric systems akin to nanoribbons were produced. Using similar methods, a bottom-up synthesis of …
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Scanning tunneling microscopy investigations of transition metal dichalcogenide 1t-tantalum disulfide and zigzag-shape graphene nanoribbons in ultra-high vacuum
… wet-chemically synthesized zigzag-shape graphene nanoribbons (GNRs) on hydrogen passivated silicon substrate through scanning tunneling microscopy (STM). Dry contact transfer allows unperturbed transfer and exfoliation of desired two-dimensional (2D) layered materials onto a desired substrate …
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Synthesis of Perylenediimide-Functionalized Silsesquioxane Nanostructures
… of perylenediimide functionalized silsesquioxane nanoribbons (PDI-dimethyl nanoribbons) as an acceptor for optoelectronic devices. We have developed synthetic procedures to make the PDI-dimethyl nanoribbons by the substitution reaction and the modified Stöber method. The PDI-dimethylethoxy silane …
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Simulation of graphene electronic devices
… with silicon technology. When patterned into nanoribbons graphene can be made into regions that are semiconducting or conducting and even into entire circuits. Graphene nanoribbons can also be used to form the channel of a MOSFET. This thesis describes numerical simulations undertaken on …
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Photonic Properties of Self -Assembled Organic Materials: Supramolecular Films, and Nanoribbon -Templated Gels and Polymers
… materials templated with dendron rodcoil (DRC) nanoribbons. A rodcoil molecule contains covalently connected rod-like and coil-like segments. The aggregation of rodcoils forms supramolecular polar layered structures with infinitymm symmetry. Nonlinear optical properties of these materials are …
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