Abstract
Using a field ion microscope, the diffusion behaviors and atomic processes of W atoms and clusters on W (1 1 1) surfaces were observed directly. The activation energy of W clusters diffusion on W (1 1 1) as a function of cluster size has an oscillatory and increasing behavior. But, the activation energy of a single W atom is especially high. The compact geometric structures are more stable and have higher activation energies of surface diffusion than structures with extra atoms at the periphery. Besides the terrace diffusion, other atomic processes such as the ascending, descending, detachment motion on W (1 1 1) surfaces were also observed. Unlike the general systems, their occurrence temperatures are quite near. These experimental results were used to discuss the formation mechanism of single atom W tips.
| Original language | English |
|---|---|
| Pages (from-to) | 7831-7834 |
| Number of pages | 4 |
| Journal | Applied Surface Science |
| Volume | 254 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 2008 Sep 30 |
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Keywords
- Field ion microscopy
- Single atom tip
- Surface thermodynamics
- Tungsten
ASJC Scopus subject areas
- Surfaces, Coatings and Films
Cite this
Dynamic study of W atoms and clusters on W (1 1 1) surfaces. / Fu, Tsu-Yi; Weng, W. J.; Tsong, T. T.
In: Applied Surface Science, Vol. 254, No. 23, 30.09.2008, p. 7831-7834.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Dynamic study of W atoms and clusters on W (1 1 1) surfaces
AU - Fu, Tsu-Yi
AU - Weng, W. J.
AU - Tsong, T. T.
PY - 2008/9/30
Y1 - 2008/9/30
N2 - Using a field ion microscope, the diffusion behaviors and atomic processes of W atoms and clusters on W (1 1 1) surfaces were observed directly. The activation energy of W clusters diffusion on W (1 1 1) as a function of cluster size has an oscillatory and increasing behavior. But, the activation energy of a single W atom is especially high. The compact geometric structures are more stable and have higher activation energies of surface diffusion than structures with extra atoms at the periphery. Besides the terrace diffusion, other atomic processes such as the ascending, descending, detachment motion on W (1 1 1) surfaces were also observed. Unlike the general systems, their occurrence temperatures are quite near. These experimental results were used to discuss the formation mechanism of single atom W tips.
AB - Using a field ion microscope, the diffusion behaviors and atomic processes of W atoms and clusters on W (1 1 1) surfaces were observed directly. The activation energy of W clusters diffusion on W (1 1 1) as a function of cluster size has an oscillatory and increasing behavior. But, the activation energy of a single W atom is especially high. The compact geometric structures are more stable and have higher activation energies of surface diffusion than structures with extra atoms at the periphery. Besides the terrace diffusion, other atomic processes such as the ascending, descending, detachment motion on W (1 1 1) surfaces were also observed. Unlike the general systems, their occurrence temperatures are quite near. These experimental results were used to discuss the formation mechanism of single atom W tips.
KW - Field ion microscopy
KW - Single atom tip
KW - Surface thermodynamics
KW - Tungsten
UR - http://www.scopus.com/inward/record.url?scp=51249109925&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=51249109925&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2008.02.130
DO - 10.1016/j.apsusc.2008.02.130
M3 - Article
AN - SCOPUS:51249109925
VL - 254
SP - 7831
EP - 7834
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
IS - 23
ER -