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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.

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

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