Selective formation of the single phase nano-clusters of Cu2O on SrTiO3(100) substrates in the size range of 10-50 nm is found to occur only in a very narrow oxygen plasma assisted molecular beam epitaxy growth parameter window, in comparison with the bulk phase diagram (for oxygen pressure vs. temperature). X-ray photoelectron spectroscopy, Auger electron spectroscopy and x-rays diffraction analysis of nano-clusters, has detected the distinctive parameter regions, where multiple phase-like forms coexist (CuO/Cu2O and Cu2O/Cu), in agreement with theoretical prediction for small systems, and as opposite to the sharp phase boundaries for the bulk. Observed changes in the nano-cluster composition are found to correlate with differences in cluster morphologies.
Revised: January 10, 2008 |
Published: May 3, 2004
Citation
Lyubinetsky I., S. Thevuthasan, D.E. McCready, and D.R. Baer. 2004.Formation of Single-Phase Oxide Nanoclusters: Cu2O on SrTiO3(100).Journal of Applied Physics 94.PNNL-SA-39186.