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Modulated Fluorescence in LB Films Based on DADQs—A Potential Sensing Surface?

Szablewski, Marek; Thompson, Richard L.; Pålsson, Lars-Olof

Modulated Fluorescence in LB Films Based on DADQs—A Potential Sensing Surface? Thumbnail


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Abstract

Novel fluorescent Langmuir-Blodgett (LB) films have been constructed from three different amphiphilic dicynaoquinodimethanes (DADQs). The DADQs varied in functional group structure, which had an impact on the LB film structure and the fluorescence properties. As the fluorescence of DADQs competes with non-radiative decay (conformational change), the packing and/or free volume in the LB film will influence the average fluorescence lifetime and integrated intensity. The pristine (blank) LB films were then exposed to a selection of non-fluorescent target analytes (some with environmental relevance) and the fluorescence was measured and analyzed relative to the pristine LB film. Exposure of the LB films to selected target analytes results in a modulation of the fluorescence, both with respect to average fluorescence lifetime and integrated intensity. The modulation of the fluorescence is different for different DADQ LB films and can be attributed to restricted non-radiative decays or charge transfer reactions between target analyte and DADQ LB film. The response from the DADQ LB films shows that these systems can be developed into sensing surfaces based on fluorescence measurements.

Journal Article Type Article
Acceptance Date Jun 13, 2022
Online Publication Date Jun 17, 2022
Publication Date Jun 2, 2022
Deposit Date Jul 6, 2022
Publicly Available Date Jul 6, 2022
Journal Molecules
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 27
Issue 12
Article Number 3893
DOI https://doi.org/10.3390/molecules27123893
Public URL https://durham-repository.worktribe.com/output/1198851

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http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited






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