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Showing 1 to 13 of 13 for “"quantum size effects"”.
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Nuclear magnetic resonance study of quantum size effects in supported platinum particles
The author has observed, and studied quantum size effects in the NMR of small, supported platinum particles with a monolayer of carbon monoxide chemically adsorbed to the surface. The effects are observed in the 13c and 195pt NMR, primarily at 4.2K. He reports nonmetallic spin-lattice relaxation, …
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Nuclear magnetic resonance study of quantum size effects in supported platinum particles
The author has observed, and studied quantum size effects in the NMR of small, supported platinum particles with a monolayer of carbon monoxide chemically adsorbed to the surface. The effects are observed in the $\sp{13}$C and $\sp{195}$Pt NMR, primarily at 4.2K. He reports nonmetallic spin-lattice …
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Quantum-size effects in the electronic structure of novel self-organized systems with reduced dimensionality
… The scientific part starts from the study of quantum-size effects in the electronic structure of a two-dimensional Ag film on the supporting substrate Ni(111). Distinct quantum well states in the sp-band of Ag were observed in photoelectron spectra. Analysis of thickness- and angle-dependent …
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Fabrication of quantum wire heterostructures and short wavelength photonic devices using the strain-induced lateral-layer ordering process
… semiconductor laser performance. The use of quantum size effects has been studied for over 25 years. It has been predicted and shown that the incorporation of one-dimensionally confined quantum wells into laser devices can significantly improve their performance. The next logical step is to …
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Quantum Electronic Effects in Ultrathin Metal Films on Semiconductors
As the size of a metallic system approaches the atomic scale, deviations from the bulk are expected in a plethora of different physical properties due to quantum size effects. In this work, two of these effects are investigated in detail: the structural distortions that arise due to quantum …
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Interfacial effects on the structure of thin metal films
… changes in its properties can occur known as quantum size effects. Bilayer oscillations in the preferred island heights as a function of thickness in Pb films grown on substrates is one example of a quantum size effect that is now well understood. Here we present a study of Pb films grown on …
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Thermal properties of nanowires and nanotubes : modeling and experiments
… on titanium dioxide nanotubes confirm that quantum size effects can cause enhancements in the specific heat at low temperature, while modeling of classical size effects in nanowires and superlattice nanowires shows that the thermal conductivity can be reduced by several orders of magnitude …
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Novel Three-Dimensional Silicon Carbide Nano-Structures
… resiliency similar to carbon nanotubes due to quantum size effects. The simplest, most cost efficient method to synthesize silicon carbide nanotubes is conversion from carbon nanotubes. By investigating the conversion mechanisms of carbon nanotubes (CNTs) to silicon carbide nanotubes (SiCNTs), …
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Fabrication and characterisation of bismuth nanowires
… at the L-point of the Brillouin zone caused by quantum-size effects, or to a blueshift of the plasma frequency produced by surface defects acting as dopants. In addition, electrical resistance of single bismuth nanowires, embdedded in the template, has been measured as a function of both wire …
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Indium growth and island height control on Si submonolayer phases
<p>The quantum size effects (QSE) make it possible to control the dimensions of self-assembled nanostructures. An important goal in present day surface science is to grow uniform sized self-assembled nanostructures. One system which has displayed a number of interesting surface structures is Pb/In …
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Synthetic Topological Quantum Matter in Nanostructured 2D Materials for Quantum Information Processing
… multilayer graphene and triangular graphene quantum dots. The thesis is organized into six chapters, including an introduction and a conclusion. In Chapter 2, we present the theoretical methods used to carry out the calculations in this thesis. We begin by defining the geometry of twisted …
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Generation of metal nanoparticles in spherical polyelectrolyte brushes and their application in heterogeneous catalysis
… cationic polystyrene core particles are synthesized by emulsion polymerization by using a cationic surfactant and a cationic thermal initiator. In the second step, a thin layer of photoinitiator is generated around the particles by addition of the photoinitiator under “starved conditions” . The …
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Electro-optic Properties of Semiconductor Nano-crystals And Electro-optic Polymers And Their Applications
… even higher response speed due to the unique quantum confinement mechanism, and they also show very high EO response because of surface and quantum size effects. Many investigative efforts have been made in the area of semiconductor nano-clusters. These efforts mainly focus on synthesizing …