Photoconducting Bragg Mirrors based on TiO2 Nanoparticle Multilayers

Authors

  • Mauricio E. Calvo,

    1. Instituto de Ciencia de Materiales de Sevilla Consejo Superior de Investigaciones Cientificas (CSIC) Américo Vespucio 49, 41092 Sevilla (Spain)
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  • Silvia Colodrero,

    1. Instituto de Ciencia de Materiales de Sevilla Consejo Superior de Investigaciones Cientificas (CSIC) Américo Vespucio 49, 41092 Sevilla (Spain)
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  • T. Cristina Rojas,

    1. Instituto de Ciencia de Materiales de Sevilla Consejo Superior de Investigaciones Cientificas (CSIC) Américo Vespucio 49, 41092 Sevilla (Spain)
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  • Juan Antonio Anta,

    1. Departamento de Sistemas Físicos Químicos y Naturales Universidad Pablo de Olavide Carretera de Utrera Km 1, 41013 Sevilla (Spain)
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  • Manuel Ocaña,

    1. Instituto de Ciencia de Materiales de Sevilla Consejo Superior de Investigaciones Cientificas (CSIC) Américo Vespucio 49, 41092 Sevilla (Spain)
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  • Hernán Míguez

    Corresponding author
    1. Instituto de Ciencia de Materiales de Sevilla Consejo Superior de Investigaciones Cientificas (CSIC) Américo Vespucio 49, 41092 Sevilla (Spain)
    • Instituto de Ciencia de Materiales de Sevilla Consejo Superior de Investigaciones Cientificas (CSIC) Américo Vespucio 49, 41092 Sevilla (Spain).
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  • This research was funded by the Spanish Ministry of Science and Education under grant MAT2005-03028 and the Ramón Areces Foundation. M.E. Calvo and S. Colodrero thank CSIC for an I3P contract and a scholarship, respectively. J.A.Anta. thanks the Spanish Ministry of Science and Education for grant ENE2004-01657/ALT and project HOPE (Consolider-Ingenio 2010) and Junta de Andalucía for project P06-FQM-01869. Supporting Information is available online from Wiley InterScience or from the authors.

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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