一种选择性检测4-氟苯酚浓度的光纤倏逝波传感器

A fiber-optic evanescent wave sensor for selective detection of 4-fluorophenol concentration

为了实现对水体中4-氟苯酚(4-FP)选择性检测,利用塑料光纤、4-FP分子印迹聚合物、壳聚糖构建了4-FP高选择性敏感的D形塑料光纤倏逝波传感器。首先制备了4-FP分子印迹聚合物溶胶及D形光纤,并将分子印迹聚合物溶胶涂覆在D形塑料光纤传感器敏感区表面。然后建立了传感器测量理论模型。最后实验研究了4-FP分子印迹聚合物涂覆厚度对传感器灵敏度的影响,以及传感器的响应时间、检测下限及选择敏感性。研究表明:传感器对4-FP具有高选择敏感性;当聚合物膜厚度约为20μm时,传感器灵敏度达到-0.000 5 L/mg,检测下限达到180μg/L。

To realize selective detection of 4-fluorophenol(4-FP) in water, a 4-FP D-shaped plastic fiber-optic evanescent wave sensor with high selectivity was fabricated by using the plastic optical fiber, 4-FP molecularly imprinted polymer and chitosan. Firstly, 4-FP molecularly imprinted polymer sol and D-shaped fiber were prepared, and the sol was coated on the surface of the D-shaped fiber. Secondly, the theoretical model of sensor was established. Thirdly, the effect of the coating thickness of 4-FP molecularly imprinted polymer on the sensitivity of sensor was investigated. Furthermore, the response time, detection lower limit and selectivity of the prepared sensors were checked. The results showed that the sensor has high selectivity to 4-FP. When the polymer coating thickness was about 20 μm, the sensitivity reached-0.000 5 L/mg, and the detection limit reached 180 μg/L.