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Issue 25, 2020
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Core–shell silica–rhodamine B nanosphere for synthetic opals: from fluorescence spectral redistribution to sensing

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Abstract

Photonic crystals are a unique tool to modify the photoluminescence of light-emitting materials. A variety of optical effects have been demonstrated by infiltrating opaline structures with photoactive media. On the other hand, the fabrication of such structures includes complex infiltration steps, that often affect the opal lattice and decrease the efficiency of light emission control. In this work, silica nanospheres were directly functionalized with rhodamine B to create an emitting shell around the dielectric core. Simple tuning of the microsphere preparation conditions allows selecting the appropriate sphere diameter and polydispersity index approaching 5%. These characteristics allow facile self-assembling of the nanospheres into three-dimensional photonic crystals whose peculiar density of photonic states at the band-gap edges induces spectral redistribution of the rhodamine B photoluminescence. The possibility to employ the new stable structure as sensor is also investigated. As a proof of principle, we report the variation of light emission obtained by exposure of the opal to vapor of chlorobenzene.

Graphical abstract: Core–shell silica–rhodamine B nanosphere for synthetic opals: from fluorescence spectral redistribution to sensing

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Supplementary files

Article information


Submitted
10 Mar 2020
Accepted
07 Apr 2020
First published
16 Apr 2020

This article is Open Access

RSC Adv., 2020,10, 14958-14964
Article type
Paper

Core–shell silica–rhodamine B nanosphere for synthetic opals: from fluorescence spectral redistribution to sensing

P. Lova, S. Congiu, K. Sparnacci, A. Angelini, L. Boarino, M. Laus, F. Di Stasio and D. Comoretto, RSC Adv., 2020, 10, 14958
DOI: 10.1039/D0RA02245D

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    [Original citation] - Published by The Royal Society of Chemistry.

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