Stasiewicz Karol A, Bereski Wiktor, Jakubowska Iwona, Kowerdziej Rafał, Węgłowska Dorota, Spadło Anna
Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland.
Polymers (Basel). 2024 Jul 25;16(15):2114. doi: 10.3390/polym16152114.
Optical fibre sensors have the potential to be overly sensitive and responsive, making them useful in various applications to detect the presence of pollutants in the environment, toxic gasses, or pesticides in soil. Deoxyribonucleic acid (DNA) as biopolymer active surfaces for fibre sensors can be designed to detect specific molecules or compounds accurately. In the article, we propose to use an optical fibre taper and DNA complex with surfactant-based sensors to offer a promising approach for gas detection, including ammonia solution, 1,4 thioxane, and trimethyl phosphate imitating hazardous agents. The presented results describe the influence of the adsorption of evaporation of measured agents to the DNA complex layer on a light leakage outside the structure of an optical fibre taper. The DNA layer with additional gas molecules becomes a new cladding of the taper structure, with the possibility to change its properties. The process of adsorption causes a change in the layer's optical properties surrounding a taper-like refractive index and increasing layer diameter, which changes the boundary condition of the structure and interacts with light in a wide spectral range of 600-1200 nm. The research's novelty is implementing a DNA complex active surface as the biodegradable biopolymer alignment for optical devices like in-line fibre sensors and those enabled for hazardous agent detection for substances appearing in the environment as industrial or even warfare toxic agents.
光纤传感器有可能过于敏感且响应迅速，这使得它们在各种应用中都很有用，可用于检测环境中的污染物、有毒气体或土壤中的农药。脱氧核糖核酸（DNA）作为光纤传感器的生物聚合物活性表面，可以设计成准确检测特定的分子或化合物。在本文中，我们提议使用光纤锥和与基于表面活性剂的传感器结合的DNA，为气体检测提供一种有前景的方法，包括氨溶液、1,4-二氧六环和模拟危险剂的磷酸三甲酯。所呈现的结果描述了被测试剂蒸发吸附到DNA复合层上对光纤锥结构外部光泄漏的影响。带有额外气体分子的DNA层成为锥结构的新包层，有可能改变其特性。吸附过程会导致围绕锥状折射率的层光学性质发生变化，并使层直径增加，这会改变结构的边界条件，并在600 - 1200 nm的宽光谱范围内与光相互作用。该研究的新颖之处在于，将DNA复合活性表面作为可生物降解的生物聚合物排列用于诸如在线光纤传感器等光学器件，以及用于检测环境中作为工业甚至战争毒剂出现的物质的危险剂检测。
