Transparent Coatings Made from Spray Deposited Colloidal Suspensions
2012
Fleury, B. | Dantelle, G. | Darbe, S. | Boilot, J. P. | Gacoin, T.
The goal of this study is to elaborate few-micrometer thick optically active coatings based on nanoparticles spray-deposited onto a substrate and to control their scattering properties through a progressive suppression of the coffee-ring effect. The modification of the aggregation state of the nanoparticles to be sprayed induces a change of the surface roughness of the films and consequently of their optical transmission. We draw the counterintuitive conclusion that a nonstable colloidal solution gives a smoother coating than a highly stabilized colloidal solution, leading to a more transparent coating. This phenomenon is demonstrated in the case of commercial TiO₂ nanoparticles, as well as of homemade luminescent YVO₄:Eu nanoparticles, and seems to be generalized to a large range of systems.
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