Coalescence of palladium nanoparticles assembled on carbon and SiC surfaces: STM and STS studies

Pd nanoparticles assembled on carbon and carbon-terminated SiC substrates were prepared by reducing palladium ions in one step chemical reduction technique. Morphology, size distribution and coalescence of the nanoparticles were studied by scanning tunneling microscopy (STM). Smaller nanoparticles a...

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Bibliographic Details
Published inOptical materials Vol. 29; no. 1; pp. 144 - 149
Main Authors Herrera-Zaldívar, M., Valenzuela-Benavides, J., Pal, U.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Amsterdam Elsevier B.V 01.10.2006
Elsevier Science
Subjects
Coalescence
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Materials science
Nanocrystalline materials
Nanoparticles
Nanoscale materials and structures: fabrication and characterization
Palladium
Physics
Scanning tunneling microscopy
Nanoparticles
Scanning tunneling microscopy
Palladium
Coalescence
Transition elements
Tunnel effect
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Summary:Pd nanoparticles assembled on carbon and carbon-terminated SiC substrates were prepared by reducing palladium ions in one step chemical reduction technique. Morphology, size distribution and coalescence of the nanoparticles were studied by scanning tunneling microscopy (STM). Smaller nanoparticles and higher coalescence events were observed for carbon substrates. The formation of Pd(111) terraces by coalescence of the nanoparticles was observed. Atomic diffusion induced by ambient exposure is proposed to explain the coalescence of the nanoparticles at the step edges of the Pd(111). Scanning tunneling spectroscopy (STS) results revealed the metallic contact between the nanoparticles and the absence of a tick non-metallic layer of residual impurities on the nanoparticle surface.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2006.03.022