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Surface Science Spectra / Volume 16 / Issue 1

Surf. Sci. Spectra 16, 1 (2009); http://dx.doi.org/10.1116/11.20110101 (12 pages)

CuxO - TiO2 Composites (x=1, 2) Studied by X-ray Photoelectron Spectroscopy

Davide Barreca1, Giorgio Carraro2, and Alberto Gasparotto2

1CNR-ISTM and INSTM, Department of Chemistry - Padova University, Via Marzolo, 1, Padova, 35131, Italy
2Padova University and INSTM, Department of Chemistry, Via Marzolo, 1, Padova, 35131, Italy

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(Published online 18 April 2011)

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CuxO - TiO2 (x=1, 2) nanocomposites were synthesized by an innovative Chemical Vapor Deposition (CVD) strategy, based on the initial growth of CuxO matrices (1) and on the subsequent dispersion of TiO2 nanoparticles (2). Cu(hfa)2•TMEDA (hfa=1,1,1,5,5,5-hexafluoro-2,4-pentanedionate; TMEDA=N,N,N',N'-tetramethylethylenediamine) and Ti(O-iPr)2(dpm)2 (O-iPr = isopropoxide; dpm=2,2,6,6-tetramethyl-3,5-heptanedionate) were used as copper and titanium molecular sources, respectively. The syntheses were carried out under O2+H2O atmospheres on Si(100) substrates. In step (1), pure and homogeneous single-phase Cu2O/CuO nanosystems were obtained at 400/550 °C, with total pressures of 3.0/10.0 mbar, respectively. Interestingly, the obtained nanocomposites were characterized by the surface formation of Cu(I)-Cu(II) mixtures, due to the occurrence of interactions between CuxO and TiO2. This work is dedicated to the characterization of two representative samples by X-ray Photoelectron Spectroscopy (XPS), focusing in particular on the analysis on the O 1s, Cu 2p and Ti 2p core levels.

© 2009 American Vacuum Society

ACKNOWLEDGMENTS

The research leading to these results has received funding from COFIN-PRIN 2008, Regione Lombardia-INSTM PICASSO program and European Community's Seventh Framework Program FP7/2007-2013 under grant agreement No ENHANCE-238409. Mr. A. Ravazzolo and Dr. A. Parfenova (CNR-ISTM and Padova University, Padova, Italy) are acknowledged for help in material synthesis and characterization.

Article Outline

  1. INTRODUCTION
  2. SPECIMEN DESCRIPTION (Accession #01108, 1 of 2)
  3. SPECIMEN DESCRIPTION (Accession #01109, 2 of 2)
  4. INSTRUMENT DESCRIPTION
  5. INSTRUMENT PARAMETERS COMMON TO ALL SPECTRA
    1. Spectrometer
    2. Geometry
    3. Ion Gun
  6. DATA ANALYSIS METHOD

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KEYWORDS and PACS

Keywords

chemical vapour deposition, copper compounds, core levels, nanocomposites, nanofabrication, nanoparticles, semiconductor growth, semiconductor materials, titanium compounds, X-ray photoelectron spectra, copper oxides, titanium dioxide, nanocomposites, CVD, x-ray photoelectron spectroscopy

PACS

  • 81.07.Bc

    Nanocrystalline materials

  • 61.46.Df

    Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

  • 81.15.Gh

    Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)

  • 79.60.Jv

    Interfaces; heterostructures; nanostructures

  • 81.05.Hd

    Other semiconductors

History
Received 5 April 2011
Accepted 5 April 2011
Published online 18 April 2011
Digital Object Identifier
http://dx.doi.org/10.1116/11.20110101

PUBLICATION DATA

ISSN

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

Publisher

American Vacuum Society

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