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High refractive index films of polymer nanocomposites

Published online by Cambridge University Press:  31 January 2011

Lorenz Zimmennann ,
Martin Weibel ,
Walter Caseri  and
Ulrich W. Suter
Lorenz Zimmennann
Affiliation:
Eidgenössische Technische Hochschule, Institut für Polymere, ETH-Zentrum, CH-8092 Zürich, Switzerland
Martin Weibel
Affiliation:
Eidgenössische Technische Hochschule, Institut für Polymere, ETH-Zentrum, CH-8092 Zürich, Switzerland
Walter Caseri
Affiliation:
Eidgenössische Technische Hochschule, Institut für Polymere, ETH-Zentrum, CH-8092 Zürich, Switzerland
Ulrich W. Suter
Affiliation:
Eidgenössische Technische Hochschule, Institut für Polymere, ETH-Zentrum, CH-8092 Zürich, Switzerland
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Abstract

Solutions of PbS particles and gelatin were used for the preparation of nanocomposites by a spin-coating process. This allows for the preparation of nanocomposite films with controlled thickness, e.g., between 40 nm and 2 μm for a film containing 45 wt.% PbS. Surface roughness and film thickness were investigated by surface profilometry and scanning electron microscopy (SEM). The refractive index at 632.8 nm can be expressed by a linear function of the volume fraction of PbS in the range of 0 to 55 vol. % PbS. In this range, the refractive index increases from 1.5 to 2.5 with increasing PbS ratio and belongs, therefore, to the highest refractive indices known for polymeric composite materials.

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Articles
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Journal of Materials Research , Volume 8 , Issue 7 , July 1993 , pp. 1742 - 1748
Copyright
Copyright © Materials Research Society 1993

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