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Surfactant-free Colloidal Crystal of ZnO Quantum Dots

Published online by Cambridge University Press:  31 January 2011

Xi Zhang ,
Dazhi Sun  and
Hung-Jue Sue
Xi Zhang
Affiliation:
[email protected], Texas A&M University, Materials Science and Engineering, College Station, Texas, United States
Dazhi Sun
Affiliation:
[email protected], Texas A&M University, Materials Science and Engineering, College Station, Texas, United States
Hung-Jue Sue
Affiliation:
[email protected], Texas A&M University, Mechanical Engineering, College Station, Texas, United States
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Abstract

Monodisperse ZnO quantum dots (QDs) with a particle size of about 5 nm have been synthesized. Isopropanol together with hexane were utilized to precipitate ZnO nanoparticles to form condensed phases, ranging from white flocculation, to gel-like fluid, and to transparent solid. The morphology and structure in the transparent ZnO solid was characterized by UV-vis, X-ray diffraction, small-angle X-ray scattering, transmission electron microscopy, and scanning electron microscopy. The mechanisms for the formation of transparent ZnO QDs close-packed structure were monitored via UV-vis spectra, and found likely to be a colloidal crystal. The colloidal crystal is transparent and absorbs UV light efficiently. Possible conditions for the formation of the ZnO QDs colloidal crystal are discussed.

Keywords

Zncrystalnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1207: Symposium N – Colloidal Nanoparticles for Electronic Applications — Light Emission, Detection, Photovoltaics and Transport , 2009 , 1207-N12-03
Copyright
Copyright © Materials Research Society 2010

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