期刊
APPLIED SCIENCES-BASEL
卷 9, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/app9183886
关键词
Cerium oxide nanoparticles; anti-reflection; self-assembly; microfluidics; convective self-assembly
类别
资金
- Agence Nationale de la Recherche (ANR) within the EVAPEC grant [13-BS09-0010-01]
- CPER CAMPUSB project
- Region Nouvelle-Aquitaine
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 (less than or similar to 2 mu m) of densely packed CeO2 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 (approximate to 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.
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