P. Veluchamy et H. Minoura, SURFACE-ANALYSIS OF ANODIC LEAD-OXIDE FILMS PREPARED IN HOT ALKALINE-SOLUTIONS, Applied surface science, 126(3-4), 1998, pp. 241-245
Citations number
20
Categorie Soggetti
Physics, Applied","Physics, Condensed Matter","Chemistry Physical","Materials Science, Coatings & Films
Lead oxide films such as alpha-PbO, beta-PbO and PbO2-x (x = 0-1) have
been prepared on a Pb electrode by anodic oxidation in hot alkaline s
olutions and characterized by X-ray photoelectron spectroscopy (XPS).
Anodic oxidation of a Pb electrode in hot alkaline solution facilitate
s selective growth of specific lead oxide phases depending upon the an
odization potential. The O Is core level binding energy (B.E.) values
of both alpha and beta-PbO phases were identical (530.1 eV), whereas P
bO2-x film exhibited a value about 0.7 eV lower (529.4 eV). These valu
es are overall higher than those reported in the literature. In additi
on, the literature data for the O Is B.E. values were almost the same
for all lead oxide phases irrespective of the Pb oxidation state. The
present results which exhibit an overall higher O Is B.E. for these fi
lms with a lower B.E. value for PbO2-x film in comparison with PbO fil
ms appears to be a new finding. Furthermore, the controversy existing
in the literature on the interpretation of O is core level spectra of
various lead oxide phases is also reviewed. (C) 1998 Elsevier Science
B.V.