Photoactive spherical colloids for opal photonic crystals

Davide Comoretto, Valentina Robbiano, Giancarlo Canazza, Luca Boarino, Guido Panzarasa, Michele Laus, Katia Sparnacci

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The synthesis and characterization of submicrometer-sized polymer particles, functionalized by different techniques with fluorescent dyes and featuring tunable surface charges, are described. Dyes with a polymerizable moiety were incorporated during emulsifier-free or seeded emulsion polymerization, whereas non-polymerizable dyes were included into preformed nanoparticles by a swelling and deswelling process. The particle surface charge was controlled through the choice of suitable initiators. All the nanoparticles were successfully used to grow high optical quality opal photonic crystals by the vertical deposition technique. Optical characterization of such photonic crystals pointed out the presence of the optical stop band and the high-energy van Hove-like structures, both scaling with the particle diameter according to the scaling laws of photonic crystals and possessing the expected angular dispersion. These results are indicative of the high size uniformity and of the surface quality of the nanospheres independently on the synthetic method adopted. Preliminary data seem to suggest some effect of the opal photonic band structure on the dye fluorescence spectra.

Lingua originaleInglese
pagine (da-a)1443-1450
Numero di pagine8
RivistaPolymer Composites
Volume34
Numero di pubblicazione9
DOI
Stato di pubblicazionePubblicato - set 2013

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