基于 DADQs 的调制荧光 LB 膜——潜在的传感表面？
Modulated Fluorescence in LB Films Based on DADQs-A Potential Sensing Surface?
机构信息
Department of Physics, Durham University, Durham DH1 3LE, UK.
Department of Chemistry, Durham University, Durham DH1 3LE, UK.
出版信息
Molecules. 2022 Jun 17;27(12):3893. doi: 10.3390/molecules27123893.
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.
新型荧光 Langmuir-Blodgett（LB）膜由三种不同的两亲性二氰基醌二甲基（DADQ）构建而成。DADQ 的官能团结构不同，这对 LB 膜结构和荧光性质有影响。由于 DADQ 的荧光与非辐射衰减（构象变化）竞争，因此 LB 膜中的堆积和/或自由体积会影响平均荧光寿命和积分强度。原始（空白）LB 膜随后暴露于一系列非荧光目标分析物（其中一些具有环境相关性），并测量和分析了相对于原始 LB 膜的荧光。LB 膜暴露于选定的目标分析物会导致荧光的调制，无论是平均荧光寿命还是积分强度。不同 DADQ LB 膜的荧光调制不同，这可以归因于目标分析物与 DADQ LB 膜之间受限的非辐射衰减或电荷转移反应。DADQ LB 膜的响应表明，这些系统可以基于荧光测量开发成传感表面。
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