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Photoconducting Bragg Mirrors based on TiO 2 Nanoparticle Multilayers
Author(s) -
Calvo Mauricio E.,
Colodrero Silvia,
Rojas T. Cristina,
Anta Juan Antonio,
Ocaña Manuel,
Míguez Hernán
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200800039
Subject(s) - materials science , photocurrent , nanoparticle , bragg's law , optics , structural coloration , optoelectronics , refractive index , nanotechnology , photonic crystal , diffraction , physics
A synthetic route to building photoconducting films of TiO 2 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.