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Your search keyword '"Drijvers, Emile"' showing total 23 results
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23 results on '"Drijvers, Emile"'

3. Interface formation during silica encapsulation of colloidal CdSe/CdS quantum dots observed by in situ Raman spectroscopy.

Author

Biermann, Amelie, Aubert, Tangi, Baumeister, Philipp, Drijvers, Emile, Hens, Zeger, and Maultzsch, Janina

Subjects
SILICA, MICROENCAPSULATION, QUANTUM dots, RAMAN spectroscopy, THICKNESS measurement
Abstract

We investigate the encapsulation of CdSe/CdS quantum dots (QDs) in a silica shell by in situ Raman spectroscopy and find a distinct shift of the CdS Raman signal during the first hours of the synthesis. This shift does not depend on the final silica shell thickness but on the properties of the initial coreshell QD. We find a correlation between the Raman shift rate and the speed of the silica formation and attribute this to the changing configuration of the outermost layers of the QD shell, where an interface to the newly formed silica is created. This dependence of Raman shift rate on the speed of silica formation process will give rise to many possible studies concerning the growth mechanism in the water-in-oil microemulsion, rendering in situ Raman a valuable instrument in monitoring this type of reaction. [ABSTRACT FROM AUTHOR]

Published
2017
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9. Solvent-Ligand Interactions in Colloidal Nanocrystals

Author

De Roo, Jonathan, primary, Yazdani, Nuri, additional, Drijvers, Emile, additional, Lauria, Alessandro, additional, Maes, Jorick, additional, Driessche, Isabel Van, additional, Niederberger, Markus, additional, Wood, Vanessa, additional, Martins, José C., additional, Infante, Ivan, additional, and Hens, Zeger, additional

Published
2018
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17. Development of a Rainbow Lateral Flow Immunoassay for the Simultaneous Detection of Four Mycotoxins

Author

Foubert, Astrid, Beloglazova, Natalia V., Gordienko, Anna, Tessier, Mickael D., Drijvers, Emile, Hens, Zeger, and De Saeger, Sarah

Abstract

A multiplex lateral flow immunoassay (LFIA) for the determination of the mycotoxins deoxynivalenol, zearalenone, and T2/HT2-toxin in barley was developed with luminescent quantum dots (QDs) as label. The synthesized QDs were hydrophilized by two strategies, that is, coating with an amphiphilic polymer or silica. The water-soluble QDs were compared with regard to their bioconjugation with monoclonal antibody (mAb) and were tested on a LFIA. Silica-coated QDs that contained epoxy groups were most promising. Therefore, green, orange, and red epoxy-functionalized silica-coated QDs were conjugated with anti-ZEN, anti-DON, and anti-T2 mAb, respectively. The LFIA was developed in accordance with the European Commission legal limits with cutoff limits of 1000, 80, and 80 μg/kg for deoxynivalenol, zearalenone, and T2/HT2-toxin, respectively. The LFIA gave a fast result (15 min) with a low false-negative rate (<5%), and the results were easy to interpret without any sophisticated equipment.

Published
2024
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22. Light Absorption Coefficient of CsPbBr 3 Perovskite Nanocrystals.

Author

Maes J, Balcaen L, Drijvers E, Zhao Q, De Roo J, Vantomme A, Vanhaecke F, Geiregat P, and Hens Z

Abstract

Inductively coupled plasma mass spectrometry (ICP-MS) was combined with UV-vis absorption spectroscopy and transmission electron microscopy to determine the size, composition, and intrinsic absorption coefficient μ i of 4 to 11 nm sized colloidal CsPbBr 3 nanocrystals (NCs). The ICP-MS measurements demonstrate the nonstoichiometric nature of the NCs, with a systematic excess of lead for all samples studied. Rutherford backscattering measurements indicate that this enrichment in lead concurs with a relative increase in the bromide content. At high photon energies, μ i is independent of the nanocrystal size. This allows the nanocrystal concentration in CsPbBr 3 nanocolloids to be readily obtained by a combination of absorption spectroscopy and the CsPbBr 3 sizing curve.

Published
2018
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23. Fabrication and characterization of SiN x /Au cavities with colloidal nanocrystals.

Author

Bisschop S, Geiregat P, Elsinger L, Drijvers E, Van Thourhout D, Hens Z, and Brainis E

Abstract

We demonstrate the fabrication and characterization of on-chip vertically-emitting SiN x /Au nanopatch cavities containing a monolayer of colloidal quantum dots. The fabrication process is based on electron-beam lithography and deterministically positions both the cavity and the emitters within the cavity with an accuracy of 10 nm. The Purcell enhancement of the spontaneous emission of the quantum dots is studied theoretically and experimentally. The fabrication technique makes it possible to pattern the quantum dot monolayer such that the quantum dots only occupy the center of the nanopatch cavity where a Purcell factor up to 7 can be reached. The work paves the way towards scalable fabrication of bright and directive single-photon sources.

Published
2018
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