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Effect of Crystal Size on the Structural and Functional Properties of Water-Stable Monodisperse ZnO Nanoparticles Synthesized Via a Polyol-Route

Published online by Cambridge University Press:  18 July 2013

Yesusa Collantes  and
Oscar Perales-Perez
Yesusa Collantes
Affiliation:
Department of Physics, University of Puerto Rico, Mayaguez 00980, PR, 00680-9044 USA
Oscar Perales-Perez
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico, Mayaguez, PR, 00680-9044 USA
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Abstract:

Highly monodispersed ZnO nanoparticles (NPs) have been synthesized in polyol medium. The control on crystal size was attempted at 180°C by monitoring the heating rate of reacting solutions and the cooling rate (quenching) at the end of the reaction time. The possibility to promote crystal growth by heterogeneous nucleation was also evaluated; in this approach, pre-synthesized 5-nm pure ZnO nanocrystals were used as seeds in fresh Zn-polyol solutions at suitable seeds/ZnO w/w ratios. As-synthesized samples were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), Fourier Transform Infrared spectroscopy (FT-IR), Absorbance (UV-vis) and Photoluminescence spectroscopy (PL). XRD measurements confirmed the formation of well crystallized ZnO-wurtzite with absence of secondary phases in both seeds and grown crystals. FT-IR analyses evidenced the presence of organic moieties on the surface of the nanoparticles that are associated to the functional groups of polyol by-products; these adsorbed species would have prevented particles from aggregation. PL measurements (excitation wavelength 345 nm) reveled that a tuning in the emission bands of ZnO NPs can be achieved through synthesis conditions and crystal size. HRTEM measurements evidenced the formation of bare ZnO NPs of 2 nm, 6 nm, 20 nm and clusters of small nanocrystals.

Keywords

optical propertiescrystal growthnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1551: Symposium R – Nanostructured Semiconductors and Nanotechnology , 2013 , pp. 117 - 122
Copyright
Copyright © Materials Research Society 2013 

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