Bump deformation of gold film induced by ultrafast laser

2021 ◽  
Author(s):  
Zhou Sh ◽  
Hong Shen
Keyword(s):  
2020 ◽  
Vol 129 ◽  
pp. 106067 ◽  
Author(s):  
M. Olbrich ◽  
T. Pflug ◽  
C. Wüstefeld ◽  
M. Motylenko ◽  
S. Sandfeld ◽  
...  

2020 ◽  
Vol 132 ◽  
pp. 106495
Author(s):  
Songhua Zhou ◽  
Kai Zhao ◽  
Hong Shen
Keyword(s):  

Author(s):  
M. Talianker ◽  
D.G. Brandon

A new specimen preparation technique for visualizing macromolecules by conventional transmission electron microscopy has been developed. In this technique the biopolymer-molecule is embedded in a thin monocrystalline gold foil. Such embedding can be performed in the following way: the biopolymer is deposited on an epitaxially-grown thin single-crystal gold film. The molecule is then occluded by further epitaxial growth. In such an epitaxial sandwich an occluded molecule is expected to behave as a crystal-lattice defect and give rise to contrast in the electron microscope.The resolution of the method should be limited only by the precision with which the epitaxially grown gold reflects the details of the molecular structure and, in favorable cases, can approach the lattice resolution limit.In order to estimate the strength of the contrast due to the void-effect arising from occlusion of the DNA-molecule in a gold crystal some calculations were performed.


2021 ◽  
Vol 33 (1) ◽  
pp. 012009
Author(s):  
Aiko Narazaki ◽  
Hideyuki Takada ◽  
Dai Yoshitomi ◽  
Kenji Torizuka ◽  
Yohei Kobayashi

2019 ◽  
Author(s):  
Kam Sang Kwok ◽  
Yuxuan Wang ◽  
Michael Cao ◽  
Hao Shen ◽  
Weinan Xu ◽  
...  

<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>


2020 ◽  
Vol 13 (6) ◽  
pp. 1-15
Author(s):  
ZHANG Guo-dong ◽  
◽  
CHENG Guang-hua ◽  
ZHANG Wei ◽  
Keyword(s):  

1997 ◽  
Vol 481 ◽  
Author(s):  
J. P. Callan ◽  
A. M.-T. Kim ◽  
L. Huangt ◽  
E. N. Glezer ◽  
E. Mazur

ABSTRACTWe use a new broadband spectroscopic technique to measure ultrafast changes in the dielectric function of a material over the spectral range 1.5–3.5 eV following intense 70-fs laser excitation. The results reveal the nature of the phase transformations which occur in the material following excitation. We studied the response of GaAs and Si. For GaAs, there are three distinct regimes of behavior as the pump fluence is increased — lattice heating, lattice disordering, and a semiconductor-to-metal transition.


2021 ◽  
Vol 118 (19) ◽  
pp. 192403
Author(s):  
Kathinka Gerlinger ◽  
Bastian Pfau ◽  
Felix Büttner ◽  
Michael Schneider ◽  
Lisa-Marie Kern ◽  
...  
Keyword(s):  

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