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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 178 for “"Metal Nanoparticles"”.
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Divalent metal nanoparticles
Metal nanoparticles hold promise for many scientific and technological applications, such as chemical and biological sensors, vehicles for drug delivery, and subdiffraction limit waveguides. To fabricate such devices, a method to position particles in specific locations relative to each other is …
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Sintering of metal nanoparticles on model substrates
The sintering of precious metal catalysts is an important problem for the automotive and chemical process industry. As these precious metal catalysts sinter, the metal nanoparticles grow, which in return causes a loss in the overall surface area from loss of the number of available reaction sites. …
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Mesoporous silica encapsulated metal nanoparticles in catalysis
… The structural and compositional design of bimetallic nanoparticles can further afford the precise control of activity and selectivity via the geometric and electronic effects of secondary metals. Intermetallic compounds are one of the special alloys with defined stoichiometry and ordered …
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Influence of metal nanoparticles on fluorescence properties
… we studied the effect of silver and gold nanoparticles of various sizes on the fluorescence properties of tris (2, 2-bipyridyl) dichloro ruthenium (II) hexahydrate (Ru (bpy)3 2+), tryptophan and phenylalanine. For (Ru (bpy)3 2+) absorbed on silver and gold nanoparticles, the fluorescence …
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Metal Organic Frameworks with catalytically active Metal Nanoparticles
… is the investigation of catalytically relevant metal nanoparticles (MNP) stabilized in porous coordination polymers (PCPs) also called metal-organic frameworks (MOFs). The syntheses of the catalyst family MNP@PCP/MOF as well as the investigation of its catalytic activity are discussed in detail. …
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Probing metal nanoparticles and assemblies with analytical ultracentrifugation
… shape measurements for macromolecular systems. Metal nanoparticles coated by a ligand shell of thiolated molecules provide diverse functionality, from targeted cellular delivery to the formation of complex assemblies. Here I show that AUC can be used to determine particle size distribution, …
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Synthesis and characterization of semiconductor and semiconductor-metal nanoparticles
… mit der Bildung von hybriden Metall-Halbleiter-Nanostrukturen dargestellt. Während der Synthese wachsen Gold-Nanokristalle auf den Spitzen der CuInSSe-Pyramiden.
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Functionalised metal nanoparticles as novel reagents for biomedical analysis.
… as ligands for the stabilisation of gold nanoparticles. The ability of these cationic phosphonium gold nanoparticles as substrates for the detection of negatively charged biomolecules has also been explored. In chapter 1, topics concerning the synthesis of functionalised gold …
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Graphene-Supported Metal Nanoparticles For Applications in Heterogeneous Catalysis
… good candidate as an effective solid support for metal catalysts. The Nobel Prize in Physics for 2010 was awarded to Andre Geim and Konstantin Novoselov "for groundbreaking experiments regarding the two-dimensional material graphene". Microwave-assisted synthesis of various metallic nanostructured …
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Photochemical Tuning of Surface Plasmon Resonances in Metal Nanoparticles
Illuminated metal nanoparticles (MNPs) feature collective electron oscillations (so-called localized surface plasmons or LSPs) which facilitate concentrating light-matter interactions to length scales below the diffraction limit. Part I of this book describes two applications of this confinement …
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Surface chemistry and growth of oxide supported metal nanoparticles
… such model catalysts, we choose to evaporate metal atoms on metal oxide single crystals and measure them under UHV conditions. The study of model catalysts could advance the understandings of fundamental catalytic properties of real catalysts and helps to optimize or redesign industrial …
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Stabilisation of metal nanoparticles by confinement on curved supports
Supported metal nanoparticles present unique chemical and physical properties compared to their bulk counterparts. Their high surface energy provides outstanding catalytic activities, opening the door not only to improved catalytic systems but also to new catalytic routes. However, their high …
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Anomalous solubility behavior of mixed monolayer protected metal nanoparticles
The solubility of mixed monolayer protected gold nanoparticles was studied. Monolayer protected metal nanoparticles are attractive materials because of the optical and electronic properties of their metal cores and because of the surface properties of their ligand coating. Recently, it was …
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Graphitic Surface Attachment by Single-Stranded DNA and Metal Nanoparticles
… highlighted in the system of several-nanometer metal particles on few-layer graphene flakes. We formed such particles by evaporation and annealing, then examined them in Scanning Electron Microscope. We found that gold nanoparticles were circular and experienced limited growth, with the radius …
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Structure and Dynamics in Ligand-Protected and Supported Metal Nanoparticles
… (HAADF-STEM) measurements characterize metal clusters and nanoparticles on the basis of the number of metal atoms they contain. Ligand-protected 13-atom gold clusters serve as a model system to illustrate the capabilities of a correlated use of these techniques. They exhibit a molecular …
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Metal Oxide-Modified Metal Nanoparticles: Synthesis, Characterization, and Catalytic Behavior
Made available in DSpace on 2015-09-25T22:12:30Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3023058.pdf: 7271652 bytes, checksum: 3f6a0d78da3d3839bd8c15a4fe926c19 (MD5) Previous issue date: 2001
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Quantum mechanical origin of the plasmonic properties of noble metal nanoparticles
… the plasmons observed experimentally for larger nanoparticles. These plasmon modes result from a constructive addition of the dipole moments of nearly degenerate single-particle excitations. The number of single-particle transitions involved increases with increasing system size, due to the …
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Thermoreflectance for Contactless Sintering Characterization: From Metal Nanoparticles to Stretchable Conductors
Sintering metal nanoparticles is a crucial step to achieve printed conductors. It is important to characterize and monitor nanoparticle sintering for process optimization and control. Here, we demonstrate that frequency-domain thermoreflectance (FDTR), an optical pump-probe technique, can be used …
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Plasmon Hybridization in Clusters of Metal Nanoparticles and Magnetic Nanoparticle Oligomers
… and material composition of individual nanoparticles to background environments tunable in real time to aggregation scheme and spatial arrangement, many avenues for controllably altering the optical properties of metal nanoclusters are being explored. In this dissertation, we will focus …
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