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 25 for “"doped carbon"”.
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Experimental characterization and computational modeling of N-doped Carbon Dots for future optoelectronic applications
… low-cost alternative is currently represented by carbon-based nanoparticles known as Carbon Dots that generally display low toxicity and excellent biocompatibility. Their most important feature is their efficient fluorescence in the visible region that in most cases varies with the excitation …
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Nitrogen doped carbon catalyst for the oxygen reduction reaction to be used for methane partial oxidation
… (CH4) is a plentiful, naturally occurring hydrocarbon, and the main constituent of natural gas. Due to its abundance, it has been well studied as both a feedstock for chemical production and as a fuel. Recently, methane has become of interest due to it’s release into the atmosphere as a result …
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Engineering carbon nanostructures : development of novel aerogel-nanotube composites and optimization techniques for nanotube growth
Carbon aerogels offer several unique advantages which make them ideal for evaluating a metal's ability to catalyze nanotube growth, including in situ carbothermic reduction of oxidized nanoparticles to their catalytic metallic phase as they form and production of a bulk quantity of nanoparticles …
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Label-free sensor for selective pathogen detection using carbon nanoparticles
… sensor based on pH-sensitive fluorescent yttrium doped carbon nanoparticles (YCNPs) embedded in agarose that can rapidly and accurately detect and discriminate pathogens in real-time. The developed sensor matrix presented pH-triggered aggregation-induced emission quenching of YCNPs in a wide pH …
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Electrochemical NOx reduction using a carbon nanospiked catalyst
… studied using a novel, nanostructured nitrogen-doped carbon nanospikes catalyst (CNS). NOx is a major environment and health concern that is typically eliminated using noble-metal gas-phase catalytic reactors. Alternatively, an electrocatalytic approach may reduce NOx to N2 using electric …
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Investigating physical properties of novel carbon-based materials
… of physical properties in three classes of novel carbon-based materials: carbon aerogels, single-walled carbon nanotubes, and high thermal conductivity graphitic foams. The experimental technique of Raman laser spectroscopy yields structural information about all of these materials that we are …
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Functional nanostructured hydrothermal carbons for sustainable technologies : heteroatom doping and superheated vapor
… using the established technique of hydrothermal carbonization (HTC). The incredible diversity of HTC was demonstrated together with small but steady advances in how HTC can be manipulated to tailor material properties for specific applications. Two main strategies were used to modify the …
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Development of Advanced Nanomaterials for Potential Lithium-Ion Battery Application
… electrode materials included nitrogen-doped carbon nanotubes (NCNTs), phosphorus-nitrogen doped carbon nanotubes (PNCNTs), and lithium titanate (Li4Ti5O12). A scalable method, ultrasonic spray pyrolysis, was developed inhouse to produce NCNTs with tunable structure as potential anode …
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Fabrication of carbon-based nanomaterials for energy conversion
… metal free catalysts have been widely developed. Carbon-based materials are one of the most important materials which have been playing a significant role in the development of energy conversion and storage devices because of their abundance, low cost, stability, easy accessibility, good …
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Computational Study of Carbon-Based Low-Dimensional Materials on Structures, Properties and Applications
… a comprehensive study on carbyne-one dimensional carbon chain-from its structure to properties has been conducted, and the extreme mechanical performance and intriguing metal-insulator transition under tension has been demonstrated. The properties of proposed 1D boron nanostructures have also been …
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Hydrogen sorption in palladium doped microporous materials
… the hydrogen uptake of bridged and chemically doped porous materials at room temperatures. XRD, Temperature Programmed Desorption and hydrogen sorption measurements were used to characterise the as-received and palladium doped porous materials. The hydrogen uptakes of as-received Maxsorb …
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Synthetic Molecular Models for the Oxygen Reduction Active Sites in Heteroatom-Doped Graphitic Electrocatalysts: Linking Heterogeneous and Homogeneous Electrocatalysis
… catalysts such as metal- and nitrogen-doped carbon (M-N-C) materials has been hampered by a lack of detail regarding the structures of the M-N4 active sites that facilitate the ORR coupled with a paucity of characterization with respect to the electrochemical behavior and properties of …
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CxNy-materials from supramolecular precursors for “All-Carbon” composite materials
… materials, the class of nitrogen-containing carbons combines non-toxicity and sustainability with outstanding properties. The versatility of this materials class is based on the opportunity to tune electronic and catalytic properties via the nitrogen content and –motifs: This ranges from the …
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Functionalized carbon surfaces for clean electrochemical energy systems
… materials that implement platinum catalysts on a carbon support (Pt/C). The high cost and limited availability of platinum hinders the applicability of FCs. Nitrogen and metal-doped carbon supports have been investigated as a non-precious metal replacement for costly precious metal-based materials …
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Sustainable photocatalysis using carbon-based materials through interfacial and solvent engineering
… attention as a pathway toward a sustainable carbon economy. Among the wide range of semiconducting materials investigated, carbon-based nanomaterials have been considered as promising candidates due to their non-toxicity, scalability, cost-effectiveness, and distinctive optical and …
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Diagnosing Band-Mediated Electrochemical Half-Reaction Mechanisms and Identifying the Unique Features Thereof
… as well as, increasingly, a means to elaborate carbon skeletons. Further development of redox catalysis methods is of central importance as we seek to eliminate the use of environmentally harmful reagents, reduce volumes of chemical waste by improving atom economy, and enable new means of …
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Group IV element-based luminescent nanoparticles: synthesis, environmental impact evaluation and bio-imaging applications
… Si, and Ge) based fluorescent materials, such as carbon dots, Si or Ge semiconductor nanocrystals, are finding favor in researchers’ eyes as they are conventionally considered as non-toxic elements and pose negligible influence on both the environment and human health. Under such context, this …
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Oxidation Chemistries Over Catalysts Containing M-N4 Active Sites
… biological oxygenase enzymes and metal nitrogen-doped carbons. These complexes can be housed within the supercages of faujasite zeolites (MPC@FAU), creating a hybrid catalyst. This dissertation comprises an integrated synthesis, structure, and function study of MPC@FAU catalysts compared to more …
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Application of scalable and inexpensive modification on carbon in clean technologies
Carbon can be a game-changing material to meet the global challenges in freshwater production and renewable conversion and storage devices due to their versatile nature. However, its hydrophobic characteristics, poor stability, low electrical conductivity, and small number of active sites limit its …
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Non-Precious Metal-Based Electrocatalysts from Prussian Blue Analogues for Energy-Related Reaction
… stage, the NiFe alloy covered with a discrete N-doped graphitic shell derived from PBA-NiFe for the OER was reported. It was found that the alloy core@discrete graphitic shell structure exhibits enhanced OER activity and stability, even superior to Ir/C. Detailed studies prove that the nitrogen …
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