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为了准确在线测量微生物燃料电池(MFC)内Fe~(3+)的浓度,基于倏逝波原理研制了一种D形塑料光纤Fe~(3+)浓度传感器。采用静电层层自组装技术,将含有Fe~(3+)指示剂的材料组装在D形光纤表面,构成Fe~(3+)敏感区。实验研究表明:传感器的灵敏度、响应时间与敏感膜的厚度和指示剂的含量有关。当Fe~(3+)敏感膜自组装层数为20层时,传感器对含Fe~(3+)离子溶液浓度为0.01mol·L-1的响应时间约13min,最低检测极限达10-6 mol·L-1,表明该传感器对Fe~(3+)离子水溶液具有良好的光学响应性能。
In order to accurately measure the concentration of Fe ~ (3 +) in microbial fuel cell (MFC), a D-shaped plastic optical fiber Fe 3+ concentration sensor was developed based on evanescent wave principle. Using electrostatic layer self-assembly technology, the material containing Fe 3+ indicator is assembled on the surface of D-shaped optical fiber to form Fe 3+ sensitive area. Experimental studies show that: the sensor sensitivity, response time and sensitive film thickness and indicator content. When the self-assembled layer of Fe 3+ sensitive membrane is 20 layers, the response time of the sensor to 0.01 mol·L-1 Fe 3+ -containing solution is about 13 min and the detection limit is 10-6 mol·L-1, indicating that the sensor has good optical response to Fe 3+ ion aqueous solution.