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Fluorescence from Coated Oxide Nanoparticles

Published online by Cambridge University Press:  15 March 2011

D. Vollath ,
I. Lamparth  and
D. V. Szabó
D. Vollath
Affiliation:
Forschungszentrum Karlsruhe, Institut fuer Materialforschung IIIP.O.Box 3640, D-76021 Karlsruhe, Germany
I. Lamparth
Affiliation:
Forschungszentrum Karlsruhe, Institut fuer Materialforschung IIIP.O.Box 3640, D-76021 Karlsruhe, Germany
D. V. Szabó
Affiliation:
Forschungszentrum Karlsruhe, Institut fuer Materialforschung IIIP.O.Box 3640, D-76021 Karlsruhe, Germany
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Abstract

In many cases, coated nanoparticles behave like isolated ones. Using the microwave plasma process, it is possible to produce oxide nanoparticles with ceramic or polymer coating. Coating the particles has the additional advantage that by proper selection of the coating it is possible to suspend the particles in distilled water without using any colloid stabilizer. From quantum dots made of sulfides or selenides, it is well known from literature that fluorescence depends strongly on the coating of the kernels. In the case of CdSe, the kernels are coated with CdS. Within this study, similar phenomena are found with coated oxide nanoparticles having sizes of ca. 6 nm exhibiting a very narrow particle size distribution. The coating consists of a second ceramic phase or a polymer one, each one influencing fluorescence differently. Obviously, the type of coating is a tool to modify fluorescence. This behavior is demonstrated on kernels made of Al2O3, ZrO2, HfO2, ZnO etc. PMMA, PTFE, or Al2O3 were used as coating material. In most cases, the fluorescence spectra showed broad bands. In some cases, such as ZnO, additionally, a sharp emission line in the UV appears. It is interesting to note that coatings made of fluorine containing polymer materials did not lead to fluorescence intensities comparable with PMMA coatings. The observed spectra are equivalent whether the powder is in aqueous suspensions or dry on a quartz glass carrier. The experimental results in this study indicate that the combination of non-fluorescent oxide core with a non-fluorescent polymer coating may lead to a nanocomposite with strong fluorescence. This is a phenomenon not described in literature until now.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V7.8
Copyright
Copyright © Materials Research Society 2002

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References

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