Resolving the atomic structure of supported nanometer-size Au clusters

1998 ◽  
Vol 58 (23) ◽  
pp. 15889-15896 ◽  
Author(s):  
D. Lovall ◽  
M. Buss ◽  
R. P. Andres ◽  
R. Reifenberger
Keyword(s):  
Atomic Structure ◽  
Nanometer Size ◽  
Au Clusters

scholarly journals Friction anisotropy: A unique and intrinsic property of decagonal quasicrystals

2008 ◽  
Vol 23 (5) ◽  
pp. 1488-1493 ◽  
Author(s):  
Jeong Young Park ◽  
D.F. Ogletree ◽  
M. Salmeron ◽  
C.J. Jenks ◽  
P.A. Thiel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Film ◽  
Atomic Force Microscope ◽  
Atomic Structure ◽  
Intrinsic Property ◽  
Friction Anisotropy ◽  
Nanometer Size ◽  
Atomic Force ◽  
Decagonal Quasicrystals ◽  
Pin On Disk

We show that friction anisotropy is an intrinsic property of the atomic structure of Al–Ni–Co decagonal quasicrystals and not only of clean and well-ordered surfaces that can be prepared in vacuum [J.Y. Park et al., Science309, 1354 (2005)]. Friction anisotropy is manifested in both nanometer-size contacts obtained with sharp atomic force microscope tips and macroscopic contacts produced in pin-on-disk tribometers. We show that the friction anisotropy, which is not observed when an amorphous oxide film covers the surface, is recovered when the film is removed due to wear. Equally important is the loss of the friction anisotropy when the quasicrystalline order is destroyed due to cumulative wear. These results reveal the intimate connection between the mechanical properties of these materials and their peculiar atomic structure.

Ordering in an ensemble of nanometer-size Au clusters on a NaCl(100) surface at high deposition rates

JETP Letters ◽  
2000 ◽  
Vol 72 (3) ◽  
pp. 148-152 ◽  
Author(s):  
V. D. Borman ◽  
A. V. Zenkevich ◽  
S. Ch. Lai ◽  
V. N. Nevolin ◽  
M. A. Pushkin ◽  
...  
Keyword(s):  
Deposition Rates ◽  
Nanometer Size ◽  
Au Clusters

scholarly journals Atomic Structure and Mass-Production of Supported Size-Selected Nanoclusters

2014 ◽  
Vol 70 (a1) ◽  
pp. C733-C733
Author(s):  
Richard Palmer
Keyword(s):  
Atomic Structure ◽  
Scanning Transmission Electron Microscopy ◽  
Metal Cluster ◽  
Magic Number ◽  
Au Clusters ◽  
Potential Energy Landscape ◽  
Transmission Electron ◽  
Imaging Results ◽  
Scanning Transmission ◽  
3D Information

Deposition of size-selected nanoclusters assembled from atoms in the gas phase is a novel route to the fabrication of <10nm surface features. I will focus on the creation and atomic structure of monodispersed metal cluster arrays which enable new model catalysts and protein biochips. The atomic structure of the clusters – previously the province of theory - is revealed experimentally [1] by aberration-corrected scanning transmission electron microscopy (STEM) in the HAADF imaging regime; we can "count" atoms and obtain 3D information not just 2D projections. Results include mass spectrometry of thiolated Au clusters, adatom dynamics on Au923 magic-number nanoclusters [2], first atomic imaging results for Au55 and Au20 and a method to explore the potential energy landscape of (Au923) clusters via cluster transformations [3], presenting a reference system for theory. A new kind of cluster beam source, to allow super-abundant generation of size-selected nanoclusters, will also be demonstrated.

TUNNELING SPECTROSCOPY OF NANOMETER-SIZE CLUSTERS DEPOSITED ON GRAPHITE

1996 ◽  
Vol 03 (01) ◽  
pp. 979-982 ◽  
Author(s):  
A. WAWRO ◽  
A. KASUYA ◽  
R. CZAJKA ◽  
Y. NISHINA
Keyword(s):  
Scanning Tunneling Microscope ◽  
Electronic Structures ◽  
Energy Gap ◽  
Current Mode ◽  
Constant Current ◽  
Vacuum System ◽  
Graphite Substrate ◽  
Scanning Tunneling ◽  
Nanometer Size ◽  
Au Clusters

The electronic structures of Sb, Ni, and Au clusters of nanometer size are discussed. Clusters were deposited on a graphite substrate and analyzed with a scanning tunneling microscope in an ultrahigh-vacuum system. Scanning at constant-current mode at different bias voltages was used as a method of spectroscopic measurements. Disappearing of the clusters images at certain range of voltage biases is attributed to occurrence of the energy gap in electronic structure of clusters, suggesting their nonmetallic behavior.

scholarly journals Can We Solve the Atomic Structure of Small Au clusters by HAADF-STEM?

2010 ◽  
Vol 16 (S2) ◽  
pp. 148-149
Author(s):  
ZW Wang ◽  
F Yin ◽  
A Bruma ◽  
RE Palmer
Keyword(s):  
Atomic Structure ◽  
Au Clusters

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

Atomic structure and formation mechanism of identically sized Au clusters grown on Si(111)-(7×7) surface

2010 ◽  
Vol 133 (12) ◽  
pp. 124706 ◽  
Author(s):  
Yaping Wu ◽  
Yinghui Zhou ◽  
Changjie Zhou ◽  
Huahan Zhan ◽  
Junyong Kang
Keyword(s):  
Formation Mechanism ◽  
Atomic Structure ◽  
Au Clusters

Radiation-induced surface decomposition

1983 ◽  
Vol 41 ◽  
pp. 368-369
Author(s):  
M. L. Knotek
Keyword(s):  
Ionizing Radiation ◽  
Atomic Structure ◽  
Chemical Bonding ◽  
Neutral Species ◽  
Radiation Induced ◽  
Physical And Chemical ◽  
Surface Decomposition ◽  
The Relationship ◽  
Electron And Photon ◽  
Surface Bond

Modern surface analysis is based largely upon the use of ionizing radiation to probe the electronic and atomic structure of the surfaces physical and chemical makeup. In many of these studies the ionizing radiation used as the primary probe is found to induce changes in the structure and makeup of the surface, especially when electrons are employed. A number of techniques employ the phenomenon of radiation induced desorption as a means of probing the nature of the surface bond. These include Electron- and Photon-Stimulated Desorption (ESD and PSD) which measure desorbed ionic and neutral species as they leave the surface after the surface has been excited by some incident ionizing particle. There has recently been a great deal of activity in determining the relationship between the nature of chemical bonding and its susceptibility to radiation damage.

Simulated Dark-Field Electron Micrographs of Point Defects and Organometallics

1975 ◽  
Vol 33 ◽  
pp. 200-201
Author(s):  
William Krakow
Keyword(s):  
Electron Micrographs ◽  
Point Defects ◽  
Structure Determination ◽  
Atomic Structure ◽  
Image Interpretation ◽  
Dark Field ◽  
Field Electron ◽  
Dark Field Microscopy ◽  
Dark Field Electron

Tilted beam dark-field microscopy has been applied to atomic structure determination in perfect crystals, several synthesized molecules with heavy atcm markers and in the study of displaced atoms in crystals. Interpretation of this information in terms of atom positions and atom correlations is not straightforward. Therefore, calculated dark-field images can be an invaluable aid in image interpretation.

Surface reconstructions of (001) cleaved GdBa2Cu3O7-δ

1992 ◽  
Vol 50 (1) ◽  
pp. 106-107
Author(s):  
H.W. Zandbergen ◽  
M.R. McCartney
Keyword(s):  
Electron Microscopy ◽  
Copper Oxide ◽  
Grain Boundaries ◽  
Atomic Structure ◽  
Oxygen Deficiency ◽  
Surface Layers ◽  
Layer Sequence ◽  
Surface Reconstructions ◽  
Good Agreement

Very few electron microscopy papers have been published on the atomic structure of the copper oxide based superconductor surfaces. Zandbergen et al. have reported that the surface of YBa2Cu3O7-δ was such that the terminating layer sequence is bulk-Y-CuO2-BaO-CuO-BaO, whereas the interruption at the grain boundaries is bulk-Y-CuO2-BaO-CuO. Bursill et al. reported that HREM images of the termination at the surface are in good agreement with calculated images with the same layer sequence as observed by Zandbergen et al. but with some oxygen deficiency in the two surface layers. In both studies only one or a few surfaces were studied.

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