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Surface Science Spectra / Volume 17 / Issue 1

Surf. Sci. Spectra 17, 76 (2010); http://dx.doi.org/10.1116/11.20070803 (11 pages)

ZnO/MgO Nanocomposites by Wet Impregnation: An XPS study

Fares Khairallah1, Antonella Glisenti1, Marta Maria Natile2, and Alessandro Galenda1

1Università di Padova, Dipartimento di Scienze Chimiche, via Marzolo 1, Padova 35131, Italy
2CNR-ISTM, Dipartimento di Scienze Chimiche, via Marzolo 1, Padova 35131, Italy

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(Published online 6 January 2012)

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Zinc oxide/magnesium oxide nanocomposite powders were prepared by wet impregnation of nanosized magnesia powders. The supporting magnesia was obtained by precipitation from a solution of magnesium nitrate. The samples are characterized by a nominal (i.e. calculated from the weighted amount of precursors) Zn/Mg atomic ratio of 0.01 (Accession #1189), 0.1 (Accession #1190), 0.25 (Accession #1191), and 0.5 (Accession #1192). The surface properties and the influence of the Zn/Mg atomic ratio are investigated by means of XPS (using a standard Al Kα). Besides the wide scan spectra, detailed spectra for the Mg 1s, Zn 2p3/2 and O 1s regions and related data are presented and discussed. XPS analysis confirms the presence of MgO and ZnO; the peak shapes are consistent with a more heterogeneous situation for the samples with lower Zn/Mg atomic ratios. The XPS Zn/Mg atomic ratio increases with increasing the nominal Zn/Mg atomic ratio reaching a plateau (of about 0.70) for the [Zn/Mg]nom = 0.25. The decrease of the O/(Mg+Zn) atomic ratio observed with increasing the Zn/Mg one (from 2.5 for [Zn/Mg]nom = 0.01 to 1.9 for [Zn/Mg]nom = 0.5) suggests a lower reactivity of ZnO with respect to atmosphere. This result is confirmed by the O 1s peak shape evolution.

© 2010 American Vacuum Society

ACKNOWLEDGMENTS

The Authors gratefully acknowledge Professor E. Tondello for his helpful and constructive discussions. F. Khairallah is thankful to the Italian Ministry of Foreign Affairs for financial support.

Article Outline

  1. SPECIMEN DESCRIPTION (Accession #01189, 1 of 4)
  2. SPECIMEN DESCRIPTION (Accession #01190, 2 of 4)
  3. SPECIMEN DESCRIPTION (Accession #01191, 3 of 4)
  4. SPECIMEN DESCRIPTION (Accession #01192, 4 of 4)
  5. INSTRUMENT DESCRIPTION
  6. INSTRUMENT PARAMETERS COMMON TO ALL SPECTRA
    1. Spectrometer
    2. Geometry
    3. Ion Gun
  7. DATA ANALYSIS METHOD

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KEYWORDS and PACS

Keywords

II-VI semiconductors, magnesium compounds, nanocomposites, nanofabrication, nanoparticles, precipitation (physical chemistry), surface chemistry, wide band gap semiconductors, X-ray photoelectron spectra, zinc compounds, zinc oxide, magnesium oxide, wet impregnation, nanocomposites, supported oxide

PACS

  • 81.16.Be

    Chemical synthesis methods

  • 82.65.+r

    Surface and interface chemistry; heterogeneous catalysis at surfaces

  • 79.60.Jv

    Interfaces; heterostructures; nanostructures

  • 82.80.Pv

    Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)

  • 81.07.Wx

    Nanopowders

History
Received 8 August 2007
Accepted 19 February 2009
Published online 6 January 2012
Digital Object Identifier
http://dx.doi.org/10.1116/11.20070803

PUBLICATION DATA

ISSN

1055-5269 (print)  
1520-8575 (online)

Publisher

American Vacuum Society

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