Quantum size effects of in situ generated colloidal cadmium sulfide particles in dioctadecyldimethylammonium chloride surfactant vesicles

1987 ◽  
Vol 91 (4) ◽  
pp. 854-861 ◽  
Author(s):  
Heribert J. Watzke ◽  
Janos H. Fendler
Keyword(s):  
Cadmium Sulfide ◽  
Size Effects ◽  
Quantum Size Effects ◽  
Quantum Size ◽  
Surfactant Vesicles

SPIN-DEPENDENT QUANTUM SIZE EFFECTS IN THE ELECTRON REFLECTIVITY OF ULTRATHIN FERROMAGNETIC CRYSTALS

2002 ◽  
Vol 09 (03n04) ◽  
pp. 1485-1491 ◽  
Author(s):  
R. ZDYB ◽  
E. BAUER
Keyword(s):  
Spin Polarization ◽  
Size Effects ◽  
Mean Free Path ◽  
Quantum Size Effects ◽  
Quantum Size ◽  
Spin Polarized ◽  
Size Contrast ◽  
Magnetic Asymmetry ◽  
Inelastic Mean Free Path

We have studied the spin-dependent quantum size effects in the reflection of 0–20 eV electrons from 2–10-ML-thick Fe microcrystals grown in situ on a W(110) surface in a spin-polarized low energy electron microscope. The goal is to obtain a better understanding of the magnetic ("asymmetry") image contrast and of the limits of spin polarization devices based on the quantum size contrast. The contrast is interpreted in terms of the band structure and of the spin-dependent inelastic mean free path. For the figure of merit of spin polarization devices, an upper limit of 5 × 10-2 is obtained.

scholarly journals In-situ x-ray scattering studies of Ag nano-structures

2016 ◽  
Author(s):  
◽  
Yiyao Chen
Keyword(s):  
Size Effects ◽  
Quantum Confinement ◽  
Quantum Size Effects ◽  
Wetting Layer ◽  
Minimum Thickness ◽  
X Ray ◽  
Quantum Size ◽  
X Ray Scattering ◽  
Ray Scattering

When metals are synthesized on the nanoscale, new physics can arise in the growth process as quantum confinement of the conduction electrons, known as quantum size effects, can lead to preferred heights of metallic nanoscale islands. Despite a significant amount of prior research, there has been a poor understanding of the growth behavior of the simple noble metal, Ag, on the Si(111)7x7 substrate and researchers have been unable to connect its growth morphology to quantum size effects. This dissertation investigated the growth of Ag on Si(111)7x7, in situ and in ultra-high vacuum, using synchrotron x-ray scattering. Because of the unique ability of this technique to explore the structure of a buried interface on the atomic scale, these studies led to a clear understanding of the role of quantum size effects in the growth behavior of this system. The studies address the epitaxial relationship between Ag and the substrate as well as the transition from the wetting layer to the growth of nanoscale islands. It is found that islands have a minimum thickness of three Ag atomic layers, which is in contrast to the bilayer on top of a wetting layer that has been reported in previous scanning tunneling microscopy studies. Ag islands are found to form after the completion of the Ag/Si(111)7x7 wetting layer and they convert the underlying wetting layer into the FCC structure of the island. The observed preference of the Ag islands is explained by the energy per area of the island, which derives from quantum confinement effects, and its two phase coexistence with the wetting layer. For thicker island heights, it is found that the distribution of island heights refl ect the minimum thickness of three layers. The height fluctuations are observed to exhibit a Poisson-like distribution where only the low heights in the fl uctuation spectrum deviate from a Poisson distribution. A model of the height distribution is presented. Techniques for exploring buried nanoscale vacancy defects in metals using diffuse x-ray scattering were also explored in this dissertation. Strain fields due to nanoscale vacancy clusters located below a surface were explored through analytical modeling of elastic displacements as well from results of accelerated molecular dynamics simulations. A method for numerically calculating diffuse scattering from nanoscale vacancy clusters was also explored. As new technologies continue to exploit thin-film metals on nanoscale dimensions, this investigation provides important new understanding about how metals grow on the nanoscale.

Search for quantum size effects in ultrathin epitaxial metallic films

1991 ◽  
Vol 16 (6) ◽  
pp. 623-638 ◽  
Author(s):  
P.A. Badoz ◽  
F. Arnaud d'Avitaya ◽  
E. Rosencher
Keyword(s):  
Size Effects ◽  
Quantum Size Effects ◽  
Metallic Films ◽  
Quantum Size

QUANTUM-SIZE EFFECTS ON THE OPTICAL PROPERTIES OF SMALL PARTICLES

1983 ◽  
Vol 44 (C10) ◽  
pp. C10-375-C10-378 ◽  
Author(s):  
P. Ahlqvist ◽  
P. de Andrés ◽  
R. Monreal ◽  
F. Flores
Keyword(s):  
Optical Properties ◽  
Size Effects ◽  
Quantum Size Effects ◽  
Small Particles ◽  
Quantum Size

Quantum size effects in semiconducting and semimetallic films

1968 ◽  
Vol 96 (9) ◽  
pp. 61-86 ◽  
Author(s):  
B.A. Tavger ◽  
V.Ya. Demikhovskii
Keyword(s):  
Size Effects ◽  
Quantum Size Effects ◽  
Quantum Size

Quantum size effects for the extraordinary Hall effect in thin magnetic films

1997 ◽  
Vol 229 (6) ◽  
pp. 401-405 ◽  
Author(s):  
A. Crépieux ◽  
C. Lacroix ◽  
N. Ryzhanova ◽  
A. Vedyayev
Keyword(s):  
Hall Effect ◽  
Size Effects ◽  
Magnetic Films ◽  
Quantum Size Effects ◽  
Quantum Size ◽  
Thin Magnetic Films ◽  
Extraordinary Hall Effect

Thermoelectric power in very thin film thermocouples: Quantum size effects

2006 ◽  
Vol 100 (11) ◽  
pp. 114905 ◽  
Author(s):  
M. Cattani ◽  
M. C. Salvadori ◽  
A. R. Vaz ◽  
F. S. Teixeira ◽  
I. G. Brown
Keyword(s):  
Thin Film ◽  
Thermoelectric Power ◽  
Size Effects ◽  
Quantum Size Effects ◽  
Quantum Size ◽  
Thin Film Thermocouples

Quantum size effects in nanocrystalline semiconducting titania layers prepared by anodic oxidative hydrolysis of titanium trichloride

1993 ◽  
Vol 97 (37) ◽  
pp. 9493-9498 ◽  
Author(s):  
Ladislav Kavan ◽  
Tiziana Stoto ◽  
Michael Graetzel ◽  
Donald Fitzmaurice ◽  
Valery Shklover
Keyword(s):  
Size Effects ◽  
Quantum Size Effects ◽  
Quantum Size ◽  
Titanium Trichloride ◽  
Hydrolysis Of
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