Solubility of porous MgF2 films in water: influence of glass substrates

MgF 2 antireflective coatings exposed to cold water show an increase of porosity and film delamination after prolonged soaking times. The related structural changes within the material were characterized by scanning electron microscopy and ellipsometric porosimetry. The glass substrate type used, na...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2017-04, Vol.82 (1), p.40-44
Main Authors: Hegmann, Jan, Jahn, Rainer, Löbmann, Peer
Format: Article
Language:English
Subjects:
Antireflection coatings
Ceramics
Chemistry and Materials Science
Cold water
Composites
Doping
Ellipsometry
Glass
Glass substrates
Inorganic Chemistry
Magnesium fluorides
Materials Science
Nanotechnology
Natural Materials
Optical and Electronic Materials
Original Paper: Functional coatings
Porosity
Room temperature
Scanning electron microscopy
Sodium
Sol-gel processes
Solubility
Stability
thin films and membranes (including deposition techniques)
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Summary:MgF 2 antireflective coatings exposed to cold water show an increase of porosity and film delamination after prolonged soaking times. The related structural changes within the material were characterized by scanning electron microscopy and ellipsometric porosimetry. The glass substrate type used, namely its sodium content, has a pronounced effect on the film microstructure and its long-term solubility. The stability of MgF 2 films could significantly be improved by Na-doping of the coating solutions. Graphical Abstract Porous MgF 2 prepared by sol-gel processing dissolve and delaminate after prolonged exposure to water at room temperature. This behavior is influenced by different glass substrates; film stability can be significantly improved by doping of sodium to the coating solutions.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-016-4280-0