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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 31 for “"Carbon nitride"”.
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Carbon Nitride and Conjugated Polymer Composite Materials
The semiconductor and photovoltaic properties of carbon nitride (CNx) thin films prepared using a reactive magnetron sputtering technique were investigated both individually and as composites with the organic conjugated polymers polybithiophene (PBT) and poly(3-hextlthiophene) (P3HT). At low …
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Carbon Nitride as a Heterogeneous Photocatalyst for Organic Transformations
… Ir or Ru metal complexes. In this thesis, carbon nitrides have been introduced as an inexpensive, stable, easy-to-synthesise, scalable and non-toxic heterogeneous photocatalyst. Prior to this work, carbon nitrides have been mostly studied as a photocatalyst for solar fuel productions and …
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Advances in Phenyl-Modified Carbon Nitride: Towards Sustainable Environmental Applications
… obtain useful products. Traditional graphitic carbon nitride (g-C3N4) has shown potential in photocatalytic applications due to its chemical stability, visible-light response, and eco-friendly composition. However, limitations such as poor charge separation and limited light absorption have …
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1, 2, and 3 Dimension Carbon/Silicon Carbon Nitride Ceramic Composites
… on 1-D nanofibers, 2-D films and 3-D bulk, carbon-rich silicon carbon nitride (SiCN) ceramics. 1-D nanofibers were prepared via electrospinning for light weight, flame retardant and conductive applications. The commercially available CerasetTM VL20, a liquid cyclosilazane pre-ceramic …
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Carbon nitride for solar H2 production coupled to organic chemical transformations
… commercial development. In this thesis, carbon nitrides (CNx) have been selected as non-toxic, stable and low-cost photocatalysts. CNx are first introduced as efficient light harvesters, to couple alcohol oxidation with proton reduction, in the presence of a Ni-based molecular catalyst. …
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Multifunctional nanocomposite titanium silicon boron carbon nitride coatings for high temperature tribological applications
Includes bibliographical references (pages 174-184).
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Multifunctional nanocomposite titanium silicon boron carbon nitride coatings for high temperature tribological applications
Includes bibliographical references (pages 174-184).
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Tuning the properties of titania and polymeric carbon nitride photocatalysts for total and selective oxidation reactions
… basados en dióxido de titanio y nitruro de carbono polimérico en reacciones de oxidación total y selectiva", se han estudiado las reacciones de fotodegradación de contaminantes emergentes y fotooxidación selectiva de compuestos orgánicos a moléculas de alto valor añadido en presencia de …
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Charge transfer engineering in Phenyl-modified Carbon Nitride-based hybrid systems: from powder Photocatalysts to Thin films
… visible-light-active photocatalysts. Graphitic carbon nitride (g-C3N4) is a promising metal-free semiconductor due to its suitable bandgap, chemical stability, and low cost; however, its performance is limited by rapid charge carrier recombination, low mobility, and inefficient charge …
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Immobilising and Interfacing Poly(Heptazine Imide) Ionic Carbon Nitride for Photo(electro)catalytic Fuel and Chemical Production
… increasing energy demand while pushing towards a carbon-neutral circular economy. Photocatalytic (PC) and photo(electro)catalytic (PEC) systems, based on a semiconductor/liquid electrolyte junction, are capable of converting and storing the energy from the sun into chemical bonds. Over the years, …
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Low Temperature Electrical Transport in 2D Layers of Graphene, Graphitic Carbon Nitride, Graphene Oxide and Boron-Nitrogen-Carbon
… dependent electrical transport properties of carbon based two-dimensional (2D) nanomaterials. Various techniques were employed to synthesize the samples. For instance, high quality large area graphene and boron, nitrogen doped graphene (BNC) were grown using thermal catalytic chemical vapor …
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Optical and structural characterization of metal oxides and carbon nitride compounds for the development of organic/inorganic hybrid systems
… takes place. The second part presents a study on carbon nitride (CN) based molecular materials performed with spectroscopy and X-ray diffraction experiments. Our characterizations reveal that CN materials present high chemical and physical stability and good control of the optical properties. …
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On new allotropes and nanostructures of carbon nitrides
In the first section of the thesis graphitic carbon nitride was for the first time synthesised using the high-temperature condensation of dicyandiamide (DCDA) – a simple molecular precursor – in a eutectic salt melt of lithium chloride and potassium chloride. The extent of condensation, namely next …
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"Reactive hard templating" : from carbon nitrides to metal nitrides
… scale by classical templating approaches. Metal nitrides are such kind of materials. They are usually produced by the conversion of metals or metal oxides in ammonia flow at high temperature (T > 1000°C), which make the application of classical templating techniques difficult. Graphitic carbon …
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Photocatalytic Degradation of Perfluorooctanoic Acid in Water by Free and Immobilised ZnO, g-C3N4 and Their Composite under UV and Visible Light Irradiation
… detected in the environment. ZnO and graphitic carbon nitride are among the most economical semiconductors which have not been widely used for PFOA decomposition. Therefore, ZnO could be an alternative to In₂O₃, as a benchmark photocatalyst for PFOA degradation, under ultraviolet (UV) …
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Density functional theory calculations on materials in photocatalysis
… holes exist in the novel graphitic carbon nitride (g-C3N4) material. In chapters 5 and 6, we focus on the conventional TiO2 material and focused on the more favoured hydrogen coupling mechanism and the electron transfer step in defected system, respectively.
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Novel nanomaterials for efficient photocatalytic ammonia synthesis
… metallic ruthenium particle modified graphitic carbon nitride photocatalysts. Compare with bulk graphitic carbon nitride, the optimal sample had 2.93-fold photocatalytic nitrate reduction to ammonia activity. We also report a facile synthesis of carbon/bismuth/bismuth oxide photocatalyst via a …
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DUAL-SIGNAL READOUT ANALYTICAL TOOLS: DESIGN, CHARACTERIZATION, AND APPLICATIONS IN SENSING
… ions, employing copper-modified graphitic carbon nitride to merge electrochemical and photoelectrochemical detection methods effectively. The third project outlines the development of a ratiometric sensor for diclofenac, incorporating a benzoquinone-modified mesoporous silica film, aimed at …
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Earth-Abundant Thin-Film Devices for Photovoltaic and Electrochemical Applications
… deposition to prevent the formation of amorphous carbon nitride impurity phases which ruin device performance. Discovery of new complexation chemistries in CZTS solutions allowed for the stabilization of a wide range of metal chloride species via Lewis acid-base interactions. This facilitated a …
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