Growth mechanism of Ni on Pt(110) at low temperature

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Abstract

Ni atoms deposited on Pt(110)-(1 × 1) and (1 × 2) surfaces are studied and compared at 130 K. The Auger uptake curve of Ni on the Pt(110)-(1 × 1) surface shows an exponential-type growth. The intensities of all (1 × 1) LEED spots decrease gradually and exhibit no oscillation during the deposition. These results demonstrate that this growth follows the Volmer-Weber mode. On the other hand, the Auger uptake curve of Ni on the Pt(110)-(1 × 2) surface shows a premonolayer break with an initial linear growth. The LEED pattern changes from (1 × 2) to a pseudo-(1 × 1) after Ni atoms fill the sites of the missing rows. After that, the Auger uptake curve turns to an exponential-type and the LEED spot patterns all diminish gradually when more Ni atoms are deposited on the Pt(110)-(1 × 2) surface. These results demonstrate that the growth of Ni on the Pt(110)-(1 × 2) surface follows the Stranski-Krastanov (SK) mode. The growth mechanism is discussed by considering the lattice mismatch, diffusion, and the surface free energies of the adsorbate and the substrate.

Original languageEnglish
Pages (from-to)74-78
Number of pages5
JournalApplied Surface Science
Volume92
DOIs
Publication statusPublished - 1996 Jan 1

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Atoms
Temperature
Lattice mismatch
Adsorbates
Free energy
Substrates

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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Growth mechanism of Ni on Pt(110) at low temperature. / Shern, Ching-Song; Tsay, Jyh-Shen; Fu, Tsu-Yi.

In: Applied Surface Science, Vol. 92, 01.01.1996, p. 74-78.

Research output: Contribution to journalArticle

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N2 - Ni atoms deposited on Pt(110)-(1 × 1) and (1 × 2) surfaces are studied and compared at 130 K. The Auger uptake curve of Ni on the Pt(110)-(1 × 1) surface shows an exponential-type growth. The intensities of all (1 × 1) LEED spots decrease gradually and exhibit no oscillation during the deposition. These results demonstrate that this growth follows the Volmer-Weber mode. On the other hand, the Auger uptake curve of Ni on the Pt(110)-(1 × 2) surface shows a premonolayer break with an initial linear growth. The LEED pattern changes from (1 × 2) to a pseudo-(1 × 1) after Ni atoms fill the sites of the missing rows. After that, the Auger uptake curve turns to an exponential-type and the LEED spot patterns all diminish gradually when more Ni atoms are deposited on the Pt(110)-(1 × 2) surface. These results demonstrate that the growth of Ni on the Pt(110)-(1 × 2) surface follows the Stranski-Krastanov (SK) mode. The growth mechanism is discussed by considering the lattice mismatch, diffusion, and the surface free energies of the adsorbate and the substrate.

AB - Ni atoms deposited on Pt(110)-(1 × 1) and (1 × 2) surfaces are studied and compared at 130 K. The Auger uptake curve of Ni on the Pt(110)-(1 × 1) surface shows an exponential-type growth. The intensities of all (1 × 1) LEED spots decrease gradually and exhibit no oscillation during the deposition. These results demonstrate that this growth follows the Volmer-Weber mode. On the other hand, the Auger uptake curve of Ni on the Pt(110)-(1 × 2) surface shows a premonolayer break with an initial linear growth. The LEED pattern changes from (1 × 2) to a pseudo-(1 × 1) after Ni atoms fill the sites of the missing rows. After that, the Auger uptake curve turns to an exponential-type and the LEED spot patterns all diminish gradually when more Ni atoms are deposited on the Pt(110)-(1 × 2) surface. These results demonstrate that the growth of Ni on the Pt(110)-(1 × 2) surface follows the Stranski-Krastanov (SK) mode. The growth mechanism is discussed by considering the lattice mismatch, diffusion, and the surface free energies of the adsorbate and the substrate.

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