Alshammari Alhulw H, Kirwa Abraham, Dunbar Alan, Grell Martin
Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Rd, Sheffield S3 7RH, UK; College of Science, Aljouf University, Airport ST, Sakaka 72388, Saudi Arabia.
Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Rd, Sheffield S3 7RH, UK; Department of Physical Sciences, Chuka University, P.O. Box 109-60400, Chuka, Kenya.
Talanta. 2019 Jul 1;199:40-45. doi: 10.1016/j.talanta.2019.02.055. Epub 2019 Feb 12.
A sensitive fibre optic fluorescence intensity meter has been designed and built as a transducer to detect quenching of conjugated polymer fluorescence with minimum adjustment between air- and waterborne analytes. Only generic, commercially available parts including optical fibres, solvents, airbrush, standard optical and electronic parts, and a digital lock-in amplifier have been used, avoiding the need for a fluorescence spectrometer. To test the instrument, optical fibres were sensitised with the generic fluorescent poly(phenylene-vinylene) derivative MDMO-PPV and exposed to a variety of vapour pressures, and concentrations in water, of the nitroaromatic explosive 2,4 dinitrotoluene (DNT). We establish dimensionless Stern-Volmer constants (K) and limit-of-detection (LoD) for air- and water-borne DNT as K(air) = 1.4 × 10vs. K(water) = 5.8 × 10 and LoD(air) = 10.9 ppb and LoD(water) = 56 ppb. These LoDs compare favourably to prior reports. We consider our study of the MDMO-PPV/DNT system as a successful test of our transducer design and recommend its wider use.
一种灵敏的光纤荧光强度计已被设计并制造出来，作为一种传感器，用于检测共轭聚合物荧光猝灭，在空气和水中的分析物之间进行最小程度的调整。仅使用了通用的、市售的部件，包括光纤、溶剂、喷枪、标准光学和电子部件以及数字锁相放大器，无需使用荧光光谱仪。为了测试该仪器，用通用的荧光聚（亚苯基亚乙烯基）衍生物MDMO-PPV对光纤进行敏化，并使其暴露于硝基芳香族炸药2,4-二硝基甲苯（DNT）的各种蒸气压和水中浓度下。我们确定了空气中和水中DNT的无量纲斯特恩-沃尔默常数（K）和检测限（LoD），分别为K（空气） = 1.4×10，K（水） = 5.8×10，LoD（空气） = 10.9 ppb，LoD（水） = 56 ppb。这些检测限与先前的报告相比具有优势。我们认为对MDMO-PPV/DNT系统的研究是对我们传感器设计的一次成功测试，并建议更广泛地使用它。
