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2013

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/48923

Photonic characteristics of Langmuir-Blodgett self-assembled monolayers of colloidal silica particles

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http://dx.doi.org/10.1166/nnl.2013.1451

Resum

Monodispersed colloidal crystals based on silica sub-micrometric particles were synthesized using the Stöber-Fink-Bohn process. The control of nucleation and coalescence result in improved characteristics such as high sphericity and very low size dispersion. The resulting silica particles show characteristics suitable for self-assembling across large areas of closely-packed 2D crystal monolayers by an accurate Langmuir-Blodgett deposition process on glass, fused silica and silicon substrates. Due to their special optical properties, colloidal films have potential applications in fields including photonics, electronics, electro-optics, medicine (detectors and sensors), membrane filters and surface devices. The deposited monolayers of silica particles were characterized by means of FESEM, AFM and optical transmittance measurements in order to analyze their specific properties and characteristics. We propose a theoretical calculation for the photonic band gaps in 2D systems using an extrapolation of the photonic behavior of the crystal from 3D to 2D. In this work we show that the methodology used and the conditions in self-assembly processes are decisive for producing high-quality two-dimensional colloidal crystals by the Langmuir-Blodgett technique.

Matèries

Nanopartícules, Col·loides, Microagregats, Química supramolecular

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Nanoparticles, Colloids, Microclusters, Supramolecular chemistry

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Articles publicats en revistes (Física Aplicada)

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CABRERA MAGAÑA, Edgar julián, JALLER, Lina m., AMADE ROVIRA, Roger, PORTAL, Sabine, PASCUAL MIRALLES, Esther, BERTRÁN SERRA, Enric. Photonic characteristics of Langmuir-Blodgett self-assembled monolayers of colloidal silica particles. _Nanoscience and Nanotechnology Letters_. 2013. Vol. 5, núm. 1, pàgs. 41-45. [consulta: 29 de gener de 2026]. ISSN: 1941-4900. [Disponible a: https://hdl.handle.net/2445/48923]

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