Transparent coatings made from spray deposited colloidal suspensions |
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Authors: | Fleury B Dantelle G Darbe S Boilot J P Gacoin T |
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Institution: | Groupe de Chimie du Solide, Laboratoire de Physique de la Matière Condensée, UMR CNRS 7643, école Polytechnique, 91128 Palaiseau, France. |
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Abstract: | 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 TiO(2) nanoparticles, as well as of homemade luminescent YVO(4):Eu nanoparticles, and seems to be generalized to a large range of systems. |
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