Self-Assembled Zinc Oxide Quantum Dots Using Spray Pyrolysis Methodology

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• 作者：Sreekumar Rajappan-Achary ; Said Agouram ; Candid Reig ; Juan F. Sa虂nchez-Royo ; M. Carmen Marti虂nez-Toma虂s ; Vicente Mun虄oz-Sanjose虂
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：September 7, 2011
• 年：2011
• 卷：11
• 期：9
• 页码：3790-3801
• 全文大小：1546K
• 年卷期：v.11,no.9(September 7, 2011)
• ISSN：1528-7505

文摘

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.