Hybrid Photonic Nanostructures by In Vivo Incorporation of an Organic Fluorophore into Diatom Algae |
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Authors: | Roberta Ragni Francesco Scotognella Danilo Vona Luca Moretti Emiliano Altamura Giacomo Ceccone Dora Mehn Stefania R Cicco Fabio Palumbo Guglielmo Lanzani Gianluca M Farinola |
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Affiliation: | 1. Dipartimento di Chimica, Università degli Studi di Bari “Aldo Moro”, Bari, Italy;2. Dipartimento di Fisica, Politecnico di Milano, Milano, Italy;3. European Commission, Directorate General Joint Research Centre, Directorate F‐Health, Consumers and Reference Materials, Consumer Products Safety Unit, Ispra, Italy;4. CNR‐ICCOM‐Bari, Dipartimento di Chimica, Bari, Italy;5. CNR‐NANOTECH‐Bari, Dipartimento di Chimica, Bari, Italy;6. Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Istituto Italiano di Tecnologia, Center for Nano Science and Technology, Milano, Italy |
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Abstract: | Biotechnological processes harnessing living organisms' metabolism are low‐cost routes to nanostructured materials for applications in photonics, electronics, and nanomedicine. In the pursuit of photonic biohybrids, diatoms microalgae are attractive given the properties of the porous micro‐to‐nanoscale structures of the biosilica shells (frustules) they produce. The investigations have focused on in vivo incorporation of tailored molecular fluorophores into the frustules of Thalassiosira weissflogii diatoms, using a procedure that paves the way for easy biotechnological production of photonic nanostructures. The procedure ensures uniform staining of shells in the treated culture and permits the resulting biohybrid photonic nanostructures to be isolated with no damage to the dye and periodic biosilica network. Significantly, this approach ensures that light emission from the dye embedded in the isolated biohybrid silica is modulated by the silica's nanostructure, whereas no modulation of photoluminescence is observed upon grafting the fluorophore onto frustules by an in vitro approach based on surface chemistry. These results pave the way to the possibility of easy production of photonic nanostructures with tunable properties by simple feeding the diatoms algae with tailored photoactive molecules. |
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Keywords: | biosilica diatoms molecular emitters photoluminescence photonic crystals |
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