Rapid synthesis of stable ZnO quantum dots
- 12 November 2002
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 92 (11), 6537-6540
- https://doi.org/10.1063/1.1518132
Abstract
Zinc oxide nanocrystallites down to 1.5 nm in diameter were made by spray combustion of Zn/Si precursors. These crystallites exhibit a quantum size effect: blueshift of light absorption with decreasing crystallite size. X-ray diffraction, high-resolution transmission electron microscopy, and nitrogen adsorption showed that the addition of controlled amounts of silica prevented the growth and stabilized the ZnO crystals. The blue shift of the ultraviolet-vis absorption edge with decreasing ZnO crystal size closely followed a correlation between optical band gap and crystallite size from the literature. The band-gap energy of these ZnO quantum dots increased with silica content in the spray and particles consistently. The as-prepared quantum dots were stable and did not require any post processing.Keywords
This publication has 22 references indexed in Scilit:
- Stable photoluminescence of zinc oxide quantum dots in silica nanoparticles matrix prepared by the combined sol–gel and spray drying methodJournal of Applied Physics, 2001
- Optical properties of ZnO loaded in mesoporous silicaJournal of Physics: Condensed Matter, 2000
- Preparation and Characterization of ZnO Clusters inside Mesoporous SilicaChemistry of Materials, 2000
- ZnO quantum particle thin films fabricated by electrophoretic depositionApplied Physics Letters, 1999
- Spectroscopic and structural characterization of electrochemically grown ZnO quantum dotsJournal of Applied Physics, 1999
- Synthesis and Growth of ZnO NanoparticlesThe Journal of Physical Chemistry B, 1998
- Enhancement effect of photoluminescence in assemblies of nano-ZnO particles/silica aerogelsJournal of Applied Physics, 1998
- Corona-assisted flame synthesis of ultrafine titania particlesApplied Physics Letters, 1995
- Photochemistry of semiconductor colloids. Preparation of extremely small ZnO particles, fluorescence phenomena and size quantization effectsChemical Physics Letters, 1985
- SPECIAL REPORTChemical & Engineering News, 1984