Alloying, Dealloying, and Reentrant Alloying in (Sub)monolayer Growth of Ag on Pt(111)

Maciej Jankowski, E. van Vroonhoven, Herbert Wormeester, Henricus J.W. Zandvliet, Bene Poelsema

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

An in situ nanoscopic investigation of the prototypical surface alloying system Ag/Pt(111) is reported. The morphology and the structure of the ultrathin Ag–Pt film is studied using low energy electron microscopy during growth at about 800 K. A very rich dynamic behavior is uncovered in which stress relief plays a governing role. Initial growth leads to surface alloying with prolonged and retarded nucleation of adislands. Beyond 50% coverage dealloying proceeds, joined by partial segregation of Pt toward the center of large islands in violent processes. Subsequently, the growing islands coalesce and consequently irregularly shaped vacancy clusters evolve. These clusters are progressively filled by segregating Pt and assume a compact shape (black spots). As a result, at around 85% coverage, the strain of the initially pseudomorphological film is almost completely relieved and Pt segregation is at its maximum. Further deposition of Ag leads to transient reentrant alloying and recovery of the pseudomorphological layer. The black spots persist even in/on several-layer-thick films. Ex situ atomic force microscopy data confirm that these are constituted by Pt(-rich) structures. The (sub)monolayer films are strongly heterogeneous.
Original languageEnglish
Pages (from-to)8353-8363
JournalJournal of physical chemistry C
Volume121
Issue number15
DOIs
Publication statusPublished - 2017

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Alloying
alloying
Monolayers
Stress relief
Ultrathin films
Thick films
Electron microscopy
Vacancies
thick films
Atomic force microscopy
electron microscopy
Nucleation
recovery
atomic force microscopy
nucleation
Recovery
energy

Keywords

  • METIS-322054
  • IR-104625

Cite this

@article{2082f3ab04e64a778b0800d91413fa4f,
title = "Alloying, Dealloying, and Reentrant Alloying in (Sub)monolayer Growth of Ag on Pt(111)",
abstract = "An in situ nanoscopic investigation of the prototypical surface alloying system Ag/Pt(111) is reported. The morphology and the structure of the ultrathin Ag–Pt film is studied using low energy electron microscopy during growth at about 800 K. A very rich dynamic behavior is uncovered in which stress relief plays a governing role. Initial growth leads to surface alloying with prolonged and retarded nucleation of adislands. Beyond 50{\%} coverage dealloying proceeds, joined by partial segregation of Pt toward the center of large islands in violent processes. Subsequently, the growing islands coalesce and consequently irregularly shaped vacancy clusters evolve. These clusters are progressively filled by segregating Pt and assume a compact shape (black spots). As a result, at around 85{\%} coverage, the strain of the initially pseudomorphological film is almost completely relieved and Pt segregation is at its maximum. Further deposition of Ag leads to transient reentrant alloying and recovery of the pseudomorphological layer. The black spots persist even in/on several-layer-thick films. Ex situ atomic force microscopy data confirm that these are constituted by Pt(-rich) structures. The (sub)monolayer films are strongly heterogeneous.",
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author = "Maciej Jankowski and {van Vroonhoven}, E. and Herbert Wormeester and Zandvliet, {Henricus J.W.} and Bene Poelsema",
year = "2017",
doi = "10.1021/acs.jpcc.6b11971",
language = "English",
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pages = "8353--8363",
journal = "Journal of physical chemistry C",
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Alloying, Dealloying, and Reentrant Alloying in (Sub)monolayer Growth of Ag on Pt(111). / Jankowski, Maciej; van Vroonhoven, E.; Wormeester, Herbert; Zandvliet, Henricus J.W.; Poelsema, Bene.

In: Journal of physical chemistry C, Vol. 121, No. 15, 2017, p. 8353-8363.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Alloying, Dealloying, and Reentrant Alloying in (Sub)monolayer Growth of Ag on Pt(111)

AU - Jankowski, Maciej

AU - van Vroonhoven, E.

AU - Wormeester, Herbert

AU - Zandvliet, Henricus J.W.

AU - Poelsema, Bene

PY - 2017

Y1 - 2017

N2 - An in situ nanoscopic investigation of the prototypical surface alloying system Ag/Pt(111) is reported. The morphology and the structure of the ultrathin Ag–Pt film is studied using low energy electron microscopy during growth at about 800 K. A very rich dynamic behavior is uncovered in which stress relief plays a governing role. Initial growth leads to surface alloying with prolonged and retarded nucleation of adislands. Beyond 50% coverage dealloying proceeds, joined by partial segregation of Pt toward the center of large islands in violent processes. Subsequently, the growing islands coalesce and consequently irregularly shaped vacancy clusters evolve. These clusters are progressively filled by segregating Pt and assume a compact shape (black spots). As a result, at around 85% coverage, the strain of the initially pseudomorphological film is almost completely relieved and Pt segregation is at its maximum. Further deposition of Ag leads to transient reentrant alloying and recovery of the pseudomorphological layer. The black spots persist even in/on several-layer-thick films. Ex situ atomic force microscopy data confirm that these are constituted by Pt(-rich) structures. The (sub)monolayer films are strongly heterogeneous.

AB - An in situ nanoscopic investigation of the prototypical surface alloying system Ag/Pt(111) is reported. The morphology and the structure of the ultrathin Ag–Pt film is studied using low energy electron microscopy during growth at about 800 K. A very rich dynamic behavior is uncovered in which stress relief plays a governing role. Initial growth leads to surface alloying with prolonged and retarded nucleation of adislands. Beyond 50% coverage dealloying proceeds, joined by partial segregation of Pt toward the center of large islands in violent processes. Subsequently, the growing islands coalesce and consequently irregularly shaped vacancy clusters evolve. These clusters are progressively filled by segregating Pt and assume a compact shape (black spots). As a result, at around 85% coverage, the strain of the initially pseudomorphological film is almost completely relieved and Pt segregation is at its maximum. Further deposition of Ag leads to transient reentrant alloying and recovery of the pseudomorphological layer. The black spots persist even in/on several-layer-thick films. Ex situ atomic force microscopy data confirm that these are constituted by Pt(-rich) structures. The (sub)monolayer films are strongly heterogeneous.

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