Epitaxial growth of MnO nanoparticles on Pt(111) by reactive deposition ofMn-2(CO)(10)

Mn-2(CO)(10) has been used as a source for depositing manganese oxide on Pt (111) at 200 degrees C in the presence of water, in ultrahigh vacuum (UHV). X-ray photoelectron spectroscopy (XPS) data of Mn2p binding energy values and satellite structure demonstrate that the species deposited is MnO. Angl e-scanned X-ray photoelectron diffraction (XPD data show that MnO grows epi taxially in a single domain. Polar XPD scans show features that are compati ble with a Volmer-Weber-type three-dimensional growth, as further confirmed by fitting the angle-scanned XPS data. The reported experimental evidence supports a deposition mechanism based on lateral enlargement of 3D nanoclus ters of MnO, in the range of exposures investigated. (C) 2000 Elsevier Scie nce B.V. All rights reserved.