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 18 of 18 for “"Pristine graphene"”.
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Chemical Vapor Deposition Grown Pristine and Chemically Doped Monolayer Graphene
… to produce large-area, high-quality monolayer graphene on Cu substrates ever since its first demonstration in 2009. Pristine graphene grown in such a way owns the natures of zero charge carriers and zero band gap. As an analogy to semi-conductor studies, substitutional doping with foreign atoms …
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Sensors: Metal-Organic Cages and Graphene
Graphene and other 2d materials have shown great promise for their ability to sense chemicals. This ability is attributed to the chemical nature of graphene, but also the fact that 2d materials have a large surface-to-area ratio, thus sensitivities towards sensing the single molecule have been …
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Electronic, optical, mechanical and thermoelectric properties of graphene
Graphene, a two-dimensional allotrope of graphite with sp^2 bonded carbon atoms, is arranged in honeycomb structure. Its quasi one-dimensional form is graphene nanoribbon (GNR). Graphene related materials have been found to display excellent electronic, chemical, mechanical properties along with …
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Large-scale graphene transfer in ultra-high vacuum and design of a low temperature ultra-high vacuum scanning tunneling microscope
… documents a way of transferring large-scale graphene onto clean surfaces in an ultra-high vacuum scanning tunneling microscope chamber via a modified direct contact transfer method. A polyethylene terephthalate (PET) film was chosen as the material for supporting graphene during the in-situ …
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Large-scale growth, fluorination, clean transfer, and layering of graphene and related nanomaterials
… (i.e., fluorination), and transfer of graphene and hexagonal boron nitride (h-BN). Further, this document explores new avenues in the large-area, heterogeneous layering of graphene, h-BN, and related nanomaterials like nanoscale water and biomolecules. It is determined that monolayer, …
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Molecular dynamics simulation of nanoporous graphene for selective gas separation
Graphene with sub-nanometer sized pores has the potential to act as a filter for gas separation with considerable efficiency gains compared to traditional technologies. Nanoporous graphene membranes are expected to yield high selectivity through molecular size exclusion effects, while achieving …
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Graphene chemical and biological sensors : modeling, systems, and applications
Graphene exhibits a unique combination of properties making it particularly promising for sensing applications. This thesis builds new graphene chemical and biological sensing technologies from the ground up by developing device models, systems, and applications. On the modeling side, this thesis …
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Multiscale Mechanics of Graphene Oxide and Graphene Based Composite Films
The mechanical behavior of graphene oxide is length scale dependent: orders of magnitude different between the bulk forms and monolayer counterparts. Understanding the underlying mechanisms plays a significant role in their versatile application. A systematic multiscale mechanical study from …
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Electronic transport properties of carbon nanotubes: the impact of atomic charged impurities
… of extrinsic atomic adsorbates was measured on pristine graphene and a network of carbon nanotubes using atomic hydrogen, cesium atoms, and dye molecules. In order to further quantify such an atomic influence, the resistance induced by a single potassium atom on metallic and semiconducting …
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Nanopores for detecting and sensing biological molecules
… e.g. MspA. Next, we explored DNA origami-graphene hybrid nanopore for DNA detection. We found that the dwell time of each base type in the hybrid pore is different and distinguishable compared to pristine graphene nanopore. The specific interaction (hydrogen bonds) between the …
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Molecular Dynamics Simulation Of Polymer Nanocomposites In Extreme Environments
… technologically important material system, i.e., pristine graphene (PG) and graphene oxide (GO) reinforced poly(ethylene oxide) (PEO), was investigated using a reactive molecular dynamics simulation methodology. The simulations were performed in both non-isothermal (dynamic gravimetric) and …
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Printable graphene sensing systems for drug and alcohol detection
… and reliable chemical sensors in the way that graphene has. Various properties of graphene such as high surface area, conductivity, flexibility, mechanical strength and most importantly the possibility of tuning its surface to develop new properties turned it into a great candidate to develop …
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Simulations of silicon-graphene anodes using machine-learning-based interatomic potentials
… and capacity fading. Carbon composite, such as graphene or amorphous carbon, incorporation into silicon anodes has emerged as a potential solution to these challenges, but a complete simulation of the silicon-carbon systems with a full lithiation-delithiation cycle remains unexplored. This …
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Optimizing electrogenic activity from photosynthetic bacteria in bioelectrochemical systems
… was greatly enhanced using custom designed graphene and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) aerogels. Pristine graphene is also shown for the first time to be a viable, low cost alternative to platinum as a cathodic catalyst. Together, these results present a …
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Towards high performance graphene nanoelectronics: materials, contacts and interfaces
… nanomaterials. More specifically, graphene has been at the forefront of this development for a wide range of macro and nanoelectronic applications due to a combination of unique electrical and thermal properties and an atomically thin lattice (~3.4 Å). Some of these applications …
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Understanding and designing carbon-based thermoelectric materials with atomic-scale simulations
… transport in carbon-based materials (e.g., graphene and crystalline C60 ), with the goal of providing insight into design rules for efficient carbon-based thermoelectric materials. We carried out a detailed atomistic study of thermal and charge transport in carbon-based materials using …
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Development of Next-Generation Construction Materials with Graphene Additives
… additives explored to address these problems, graphene-based materials have emerged in the last few years as one of the most promising additives with many exciting results. However, it is still lacking the depth of understanding the influence of key parameters of graphene materials, such as …
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Investigation of nanoscale mechanisms driving erosion and pitting in graphitic carbon
… developed to understand pitting in multi-layer graphene, initiated by adsorbed oxygen surface groups on the graphene basal plane. A carbon-oxygen reaction model from prior studies is modified and used, with the main modification being the addition of reactions that result in defect initiation …