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Proceedings Paper

SiO2 coatings on glass containing copper colloids using the sol-gel technique
Author(s): Martin Mennig; Mike Schmitt; Bernd Kutsch; Helmut K. Schmidt
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Paper Abstract

A sol-gel method for the preparation of transparent copper nano particle-containing SiO2 coatings on glass has been developed. The sol is synthesized from alkoxysilanes and tetra ethyl orthosilicate with copper ammine complexes, prepared from Cu2+ salts and amino alkoxy silanes. Glass substrates are coated by dipping and layers up to 1 micrometers in thickness are obtained after thermal densification at temperatures between 200 degree(s) - 500 degree(s)C. The Cu colloid formation can be achieved using a reducing atmosphere during densification. Thus reddish-brown colored coatings on glass with optical densities between 0.5 and 2 are obtained. Under ambient air the color turns from reddish-brown to dark green. This process is reversible and by re-heating under reducing conditions the reddish-brown color can be re- established. UV-VIS absorbance measurements and structural investigations by WAXS, TEM, ESCA and SNMS show that the green color is due to an oxide layer at the colloidal interface.

Paper Details

Date Published: 13 October 1994
PDF: 10 pages
Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.188942
Show Author Affiliations
Martin Mennig, Institut fuer Neue Materialien (Germany)
Mike Schmitt, Institut fuer Neue Materialien (Germany)
Bernd Kutsch, Institut fuer Neue Materialien (Germany)
Helmut K. Schmidt, Institut fuer Neue Materialien (Germany)

Published in SPIE Proceedings Vol. 2288:
Sol-Gel Optics III
John D. Mackenzie, Editor(s)

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