Self-Assembled Zinc Oxide Quantum Dots Using Spray Pyrolysis Methodology

Self-assembled ZnO quantum dots (QDs) have been obtained on different substrates by using the atmospheric spray pyrolysis methodology under well-defined growth conditions. The evolution of size and density of ZnO QDs as a function of precursor concentration, growth temperature, spraying time and spr...

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Veröffentlicht in:Crystal growth & design 2011-09, Vol.11 (9), p.3790-3801
Hauptverfasser: Rajappan-Achary, Sreekumar, Agouram, Said, Reig, Candid, Sánchez-Royo, Juan F, Martínez-Tomás, M. Carmen, Muñoz-Sanjosé, Vicente
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Sprache:eng
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Zusammenfassung:Self-assembled ZnO quantum dots (QDs) have been obtained on different substrates by using the atmospheric spray pyrolysis methodology under well-defined growth conditions. The evolution of size and density of ZnO QDs as a function of precursor concentration, growth temperature, spraying time and spraying rate has been studied. The analysis of the growth process reveals that a mono layer of isolated ZnO QDs grows over a thin (lesser than 10 nm) continuous wetting layer of ZnO. The QDs were characterized by using scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, and X-ray photoelectron spectroscopy. X-ray photoelectron spectra from ZnO QDs showed a shift in the binding energy of about 0.57 eV (toward higher energy) with respect to ZnO thin films, which is because in these QDs stress relaxes elastically.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg2003113