Vibrational properties of Na nanoclusters self-assembled on Si(111) surface
SCIE
SCOPUS
- Title
- Vibrational properties of Na nanoclusters self-assembled on Si(111) surface
- Authors
- Hwang, CG; Kim, ND; Shin, SY; Chung, JW; Nam, JH; Kim, MK; Park, CY; Ahn, JR
- Date Issued
- 2008-07-01
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- We have investigated structural and vibrational properties of Na nanoclusters self-assembled on the Si(111)-7 x 7 surface at room temperature mainly using high-resolution electron-energy-loss spectroscopy. We observe three characteristic loss peaks L-1, L-2, and L-3 ascribed to an interband transition, a local atomic vibration, and another interband transition from an Na nanocluster-induced state, respectively. The spectral change of L, with Na coverage 0 suggests that the S, dangling bond band is gradually filled up to open a band gap with increasing 0 up to 1.1 eV when all three loss peaks completely disappeared. The relatively high loss energy E-1 = 243 meV of L-2 with a narrow linewidth of 32 meV indicates the only Na-Si atomic vibrational mode with Na atoms occupying the tilted on-top sites above Si rest atoms. Furthermore the extremely weak loss peak L-3 visible at a coverage range unique only to the Na nanoclusters proves the presence of a Na nanoclusters-induced electronic state N-2. These observations provide explanation to most unresolved spectral behavior of earlier photoemission study and evidence for the atomic structure of the Na nanocluster. (C) 2008 Elsevier B.V. All rights reserved.
- Keywords
- surface electronic phenomena; vibrational property; electron energy loss spectroscopy; nanocluster; surface structure; GROWTH; DOTS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22625
- DOI
- 10.1016/j.susc.2008.05.011
- ISSN
- 0039-6028
- Article Type
- Article
- Citation
- SURFACE SCIENCE, vol. 602, no. 13, page. 2300 - 2304, 2008-07-01
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