ROMASANTA, Laura; D’ALENÇON, Lauriane; KIRCHNER, Sara; PRADERE, Christophe; LENG, Jacques

doi:10.3390/app9183886

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Applied Sciences. 2019-10-01, vol. 9, n° 18, p. 3886

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Cerium oxide, in addition to its catalytic properties, is also known for its optical properties such as ultraviolet (UV) radiation filtering and a relatively high refractive index (n > 2), which makes it an excellent candidate for multifunctional coatings. Here, we focus on the optical properties of thin deposits (2 µm) of densely packed CeO 2 nanoparticles, which we assemble using two evaporation-based techniques: convective self-assembly (CSA, a type of very slow blade-coating) to fabricate large-scale coatings of controllable thickness-from tens of nanometres to a few micrometers-and microfluidic pervaporation which permits us to add some micro-structure to the coatings. Spectroscopic ellipsometry yields the refractive index of the resulting nano-porous coatings, which behave as lossy dielectrics in the UV-visible regime and loss-less dielectrics in the visible to infra-red (IR) regime; in this regime, the fairly high refractive index (≈1.8) permits us to evidence thickness-tunable anti-reflection on highly refractive substrates, such as silicon, and concomitant enhanced transmissions which we checked in the mid-IR region.< Réduire

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Cerium oxide nanoparticles

anti-reflection

self-assembly

microfluidics

convective self-assembly

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Thin Coatings of Cerium Oxide Nanoparticles with Anti-Reflective Properties

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