Optical Responses of Localized and Extended Modes in a Mesoporous Layer on Plasmonic Array to Isopropanol Vapor
| Autor: | Ryosuke Kamakura, Mauricio E. Calvo, Taisuke Atsumi, Elena Cabello-Olmo, Katsuhisa Tanaka, Gabriel Lozano, Hernán Míguez, Shunsuke Murai |
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| Přispěvatelé: | European Commission, Ministerio de Economía y Competitividad (España), Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, Ministerio de Economía y Competitividad (MINECO). España |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Capillary condensation business.industry Physics::Optics 02 engineering and technology Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Condensed Matter::Soft Condensed Matter General Energy Dispersion (optics) Optoelectronics Physical and Theoretical Chemistry Photonics 0210 nano-technology Mesoporous material business Refractive index Plasmon Localized surface plasmon |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname idUS. Depósito de Investigación de la Universidad de Sevilla The Journal of Physical Chemistry C The Journal of Physical Chemistry. C, Nanomaterials and Interfaces |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Mesoporous silica features open and accessible pores that can intake substances from the outside. The combination of mesoporous silica with plasmonic nanostructures represents an interesting platform for an optical sensor based on the dependence of plasmonic modes on the refractive index of the medium in which metallic nanoparticles are embedded. However, so far only a limited number of plasmonic nanostructures are combined with mesoporous silica, including random dispersion of metallic nanoparticles and flat metallic thin films. In this study, we make a mesoporous silica layer on an aluminum nanocylinder array. Such plasmonic arrangements support both localized surface plasmon resonances (LSPRs) and extended modes which are the result of the hybridization of LSPRs and photonic modes extending into the mesoporous layer. We investigate in situ optical reflectance of this system under controlled pressure of isopropanol vapor. Upon exposure, the capillary condensation in the mesopores results in a gradual spectral shift of the reflectance. Our analysis demonstrates that such shifts depend largely on the nature of the modes; that is, the extended modes show larger shifts compared to localized ones. Our materials represent a useful platform for the field of environmental sensing |
| Databáze: | OpenAIRE |
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