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Characterization of bimetallic Au/Pd(110) surfaces


Moors, Marco; Kobiela Tomasz; Kralj, Marko; Pertram, Tobias; Becker, Conrad; Wandelt, Klaus
Characterization of bimetallic Au/Pd(110) surfaces // e-Journal of Surface Science and Nanotechnology, 7 (2009), 448-454 doi:10.1380/ejssnt.2009.448 (međunarodna recenzija, članak, znanstveni)


Naslov
Characterization of bimetallic Au/Pd(110) surfaces

Autori
Moors, Marco ; Kobiela Tomasz ; Kralj, Marko ; Pertram, Tobias ; Becker, Conrad ; Wandelt, Klaus

Izvornik
E-Journal of Surface Science and Nanotechnology (1348-0391) 7 (2009); 448-454

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Photoelectron spectroscopy; Scanning tunneling microscopy; Gold; Palladium; Alloy

Sažetak
The growth as well as the compositional, electronic and structural properties of thin Au films deposited on a Pd(110) single crystal have been studied by means of ultraviolet photoelectron spectroscopy (UPS), photoemission of adsorbed xenon (PAX) and scanning tunneling microscopy (STM) as a function of film thickness (ranging from submonolayer amounts up to multilayers) and temperature. Our investigations indicate a Volmer-Weber growth mode of Au on Pd(110) at a deposition temperature of 300 K and below. As former studies already have shown, depositing Au amounts of less than 1 ML results in the formation of unreconstructed pseudomorphic Au islands. Above a critical thickness of 2 ML the formation of a (1 × 2) missing-row reconstruction typical for Au can be observed. This reconstructed Au bilayer is still in registry with Pd(110) and, thus, strained. Furthermore, our experiments show a strong temperature dependence of the surface morphology. Au multilayers prepared at 150 K, which are already quite flat, undergo a weak smoothening of the topmost atomic layer by annealing the sample up to 350 K. At a surface temperature of ∼ 450 K the diffusion of Au atoms into the bulk is initiated at the Au-Pd interface. Annealing a 3 ML thick Au film to 600 K finally results in the formation of an Au-Pd surface alloy, which is stable up to 900 K. A complete loss of Au from the surface can be detected at around 1050 K. Adsorption of CO as a probe molecule on the Au containing surfaces is only possible at low temperatures.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
035-0352828-2840 - Elektronska i kristalna struktura poduprtih samoorganiziranih nano-sistema (Petar Pervan, )

Ustanove
Institut za fiziku, Zagreb

Autor s matičnim brojem:
Marko Kralj, (226051)

Časopis indeksira:


  • Web of Science Core Collection (WoSCC)
    • Emerging Sources Citation Index (ESCI)
  • Scopus


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