Please use this identifier to cite or link to this item:
doi:10.22028/D291-24519
Title: | Synthesis of Ag-colloids in sol-gel derived SiO2-coatings on glass |
Author(s): | Mennig, Martin Schmitt, Mike Schmidt, Helmut K. |
Language: | English |
Year of Publication: | 1997 |
OPUS Source: | Journal of sol gel science and technology. - 8. 1997, 1/3, S. 1035-1042 |
SWD key words: | Kolloidales Silber Sol-Gel-Verfahren Photochromes Glas Glas Kalknatronglas Fused Silica Tetraethylsilicat <Tetraethylorthosilicat> |
DDC notations: | 620 Engineering and machine engineering |
Publikation type: | Journal Article |
Abstract: | Ag colloid-containing coatings on soda lime glass and fused silica are prepared via the sol-gel process. To incorporate Ag+-ions in the coatings homogeneously, they are stabilized by a functionalised silane (aminosilane) and then mixed with the basic sol prepared from 3-glycidoxypropyl trimethoxysilane (GPTS) and tetraethoxysilane (TEOS). Crack-free and transparent coatings with a thickness of 0.5 to 1.2 µm, are obtained by heat treatment between 120°C and 600°C. The Ag-colloid formation was monitored by UV-VIS spectroscopy as a function of temperature. The investigations reveal that the substrate has a deciding influence on the Ag-colloid formation caused by alkali diffusion from the substrate into the coating. High resolution transmission electron microscopy (HRTEM) investigations prove that poly-crystalline AgxOy-nanoparticles are formed during thermal densification in the coatings and that this change is accompanied by a vanishing of the yellow colour of the coatings. A post-heat treatment in a reducing atmosphere (90% N2, 10% H2) turns back the yellow colour and single-crystalline Ag-colloids can be detected by HRTEM. A suitable choice of the temperature and time conditions allows the control of the colloid size during heat treatment in a reducing atmosphere. For comparison, ion-exchange experiments have been carried out which showed that a spontaneous Ag-colloid formation was achieved in the soda lime substrate at 400°C. Since Ag containing SiO2-coatings remained colourless after thermal treatment between 400°C and 600°C in air, on soda lime substrates, a remarkable diffusion of Ag+ into the substrate was excluded. |
Link to this record: | urn:nbn:de:bsz:291-scidok-28359 hdl:20.500.11880/24575 http://dx.doi.org/10.22028/D291-24519 |
Date of registration: | 21-Apr-2010 |
Faculty: | SE - Sonstige Einrichtungen |
Department: | SE - INM Leibniz-Institut für Neue Materialien |
Collections: | INM SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
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sm199705.pdf | 1,1 MB | Adobe PDF | View/Open |
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