Photoconducting Bragg Mirrors based on TiO2 Nanoparticle Multilayers
Abstract
Abstract A synthetic route to building photoconducting films of TiO2 nanoparticles that display bright structural color is presented. The color arises as a result of the periodic modulation of the refractive index, which is achieved by controlling the degree of porosity of each alternate layer through the particle size distribution of the precursor suspensions. The suspensions are cast in the shape of a film by spin‐coating, which allows tailoring of the lattice parameter of the periodic multilayer, thus tuning the Bragg peak spectral position (i.e., its color) over the entire visible region. Photoelectrochemical measurements show that the Bragg mirrors are conductive and distort the photocurrent response as a result of the interplay between photon and electron transport.
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Bragg mirrors rely on a multilayer structure of quarter-wavelength thin films of two dielectric materials with different refractive indices; they can also be fabricated using a single material with periodically varying pore gradient.
“A particular case of dielectric mirrors is represented by Bragg mirrors, whose architecture relies on a multilayer structure comprising quarter-wavelength thin films of two dielectric materials with different refractive indices ( n low and n high ). Bragg structures can also be fabricated using a single material in which the pore gradient varies periodically [233-235].”
From Metal Oxide Thin Films for Advanced Photonic Applications (2026) · cites this paper as [235]
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Metal Oxide Thin Films for Advanced Photonic Applications
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- Authors
- Calvo, M. E., Colodrero, S., Rojas, T. C., Anta, J. A., Ocaña, M., & Míguez, H.
- Affiliations
- Consejo Superior de Investigaciones Científicas (ES)
- Universidad Pablo de Olavide (ES)
- Corresponding author
- Míguez, Hernán
- ORCID
- Venue
- Advanced Functional Materials
- Publisher
- Wiley
- Published
- 2008-09-16
- Volume
- 18
- Issue
- 18
- Pages
- 2708-2715
- ISSN
- 1616-301X (ISSN-L)
- 1616-3028
- OpenAlex
- W2084705822
- Cited by
- 88
- References
- 39
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 2 · 2023: 3 · 2022: 4 · 2020: 1 · 2019: 3 · 2018: 7 · 2017: 4 · 2016: 8 · 2015: 8 · 2014: 6 · 2013: 3 · 2012: 8
- FWCI
- 5.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Advanced Functional Materials (publishedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photonic Crystals and Applications
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Physical Sciences › Materials Science › Surfaces, Coatings and Films › Optical Coatings and Gratings
- Keywords
- titanium dioxide nanoparticles, structural color, refractive index modulation, porosity control, particle size distribution, spin coating, lattice parameter tuning, photoelectrochemistry, photoresponse
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