Refraction and reflection of ultrasonic surface waves by thin-gold-film layers on lithium-niobate substrates

1970 ◽  
Vol 6 (17) ◽  
pp. 533 ◽  
Author(s):  
M.E. Pedinoff ◽  
M. Waldner
Keyword(s):  
Lithium Niobate ◽  
Surface Waves ◽  
Gold Film ◽  
Thin Gold Film ◽  
Ultrasonic Surface Waves

Nano-Folded Gold Electrocatalysts Enhance the Selectivity of Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kam Sang Kwok ◽  
Yuxuan Wang ◽  
Michael Cao ◽  
Hao Shen ◽  
Weinan Xu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Mass Transport ◽  
Gold Film ◽  
X Ray Diffraction ◽  
Thin Gold Film ◽  
Faradaic Efficiency ◽  
X Ray ◽  
Transmission Electron ◽  
Carbon Monoxide Formation ◽  
Catalytic Interfaces

<p>The local structure and geometry of catalytic interfaces can influence the selectivity of chemical reactions. Here, using a pre-strained polymer, we uniaxially compress a thin gold film to form a nano-folded catalyst. We observe two kinds of folds and can tune the ratio of loose to tight folds by varying the extent of pre-strain in the polymer. We characterize the nano-folded catalysts using x-ray diffraction, scanning, and transmission electron microscopy. We observe grain reorientation and coarsening in the nano-folded gold catalysts. Electroreduction of carbon dioxide with these nano-folded catalysts reveals an enhancement of Faradaic efficiency for carbon monoxide formation by a factor of about four. This result suggests that electrolyte mass transport limitations and an increase of the local pH in the tight folds of the catalyst outweigh the effects of alterations in grain characteristics. Together, our studies demonstrate that nano-folded geometries can significantly alter grain characteristics, mass transport, and catalytic selectivity. </p>

Increased transmission of a thin gold film by adsorbed layers of dye molecules

2002 ◽  
Vol 80 (20) ◽  
pp. 3715-3717 ◽  
Author(s):  
Ulrich C. Fischer ◽  
Eugene Bortchagovsky ◽  
Jörg Heimel ◽  
René T. Hanke
Keyword(s):  
Gold Film ◽  
Dye Molecules ◽  
Thin Gold Film ◽  
Adsorbed Layers

Femtosecond pulsed laser ablation of thin gold film

2002 ◽  
Vol 34 (3) ◽  
pp. 199-202 ◽  
Author(s):  
K. Venkatakrishnan ◽  
B. Tan ◽  
B.K.A. Ngoi
Keyword(s):  
Laser Ablation ◽  
Gold Film ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Thin Gold Film ◽  
Femtosecond Pulsed Laser

Model of atomic hydrogen adsorption on thin gold film surface

Vacuum ◽  
1994 ◽  
Vol 45 (2-3) ◽  
pp. 299-301 ◽  
Author(s):  
L. Stobiński ◽  
R. Duś
Keyword(s):  
Atomic Hydrogen ◽  
Hydrogen Adsorption ◽  
Gold Film ◽  
Film Surface ◽  
Thin Gold Film

Study the Heat Transfer Process From Electron-Phonon Nonequilibrium in Thin Gold Film to Glass Substrate Through Transient Thermoreflectance Measurements

2010 ◽  
Author(s):  
Weigang Ma ◽  
Haidong Wang ◽  
Xing Zhang ◽  
Wei Wang
Keyword(s):  
Heat Transfer ◽  
Transfer Process ◽  
Borosilicate Glass ◽  
Glass Substrate ◽  
Physical Vapor Deposition ◽  
Gold Film ◽  
Coupling Factor ◽  
Heat Transfer Process ◽  
Thin Gold Film ◽  
Open Question

How the energy transfers during electron-phonon nonequilibrium in thin metal films is still an open question, and how to measure the intrinsic thermal transport properties of the material under the covering layer is another challenge. In this paper, the heat transfer process from electron-phonon nonequilibrium in thin gold film to borosilicate glass substrate has been studied by resorting to different segments of the transient thermoreflectance signal, which is obtained from the rear-pump front-probe transient thermoreflectance technique. The gold film, which has a thickness of 23.1 nm, is deposited on the borosilicate glass substrate using using a physical vapor deposition (PVD) approach. Within the framework of the two-temperature model (TTM), the electron-phonon (e-ph) coupling factors of the gold film, which reflect the strength of heat flow from hot electrons to cold phonons, are derived from the signal taken after the first several picoseconds with different pump fluences, and the measured value is (1.95–2.05)×1016 W m−3 K−1. The electron-phonon coupling factor does not significantly change in response to the pump pulse fluence variation and exhibits little change compared to the bulk gold value 2.4×1016 W m−3 K−1. Furthermore, the thermal conductivity of the glass substrate is obtained through the thermoreflectance signal between 20 to 140 picoseconds and the value is W m−1 K−1.

Asymmetric Light Diffraction from Nonsinusoidal Ultrasonic Surface Waves

1971 ◽  
Vol 42 (10) ◽  
pp. 3670-3673 ◽  
Author(s):  
Thomas H. Neighbors ◽  
Walter G. Mayer
Keyword(s):  
Surface Waves ◽  
Light Diffraction ◽  
Ultrasonic Surface Waves

Characterization of Surfaces and Coatings Using Laser-Generated Ultrasonic Surface Waves

1996 ◽  
pp. 585-592 ◽  
Author(s):  
A. Abbate ◽  
S. C. Schroeder ◽  
B. E. Knight ◽  
F. Yee ◽  
J. Frankel ◽  
...  
Keyword(s):  
Surface Waves ◽  
Ultrasonic Surface Waves
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