Huang Yan, Wang En-Bo, Li Ping, Cao Jia-Wen, Lyu Guo-Hui
Opt Express. 2024 Mar 25;32(7):10887-10898. doi: 10.1364/OE.515318.
In this paper, we propose a surface plasmon resonance (SPR) fiber-optic pH sensor combined with a tilted fiber Bragg grating (TFBG) by continuously coating gold and polyaniline (PANI) onto the surface of a TFBG. The micron-scale thickness polyaniline film provides the sensor with good sensitivity, and it achieves accurate measurement of pH values ranging from 2 to 12 by utilizing the pH-responsive mechanism of PANI and the surface plasmon resonance characteristics. Experimental results show that within the 2-12 pH range, the sensitivity of the TFBG surface plasmon resonance pH sensor based on PANI coating is 0.50335 nm/pH, and results demonstrate, a linear correlation coefficient between wavelength and pH value reaching 0.96614. This indicates significant potential for future engineering applications in real-world pH measurement using this sensor.
在本文中，我们通过在倾斜光纤布拉格光栅（TFBG）表面连续涂覆金和聚苯胺（PANI），提出了一种结合倾斜光纤布拉格光栅的表面等离子体共振（SPR）光纤pH传感器。微米级厚度的聚苯胺薄膜为传感器提供了良好的灵敏度，并且利用聚苯胺的pH响应机制和表面等离子体共振特性，实现了对2至12范围内pH值的精确测量。实验结果表明，在2-12 pH范围内，基于聚苯胺涂层的TFBG表面等离子体共振pH传感器的灵敏度为0.50335 nm/pH，结果表明，波长与pH值之间的线性相关系数达到0.96614。这表明该传感器在实际pH测量的未来工程应用中具有巨大潜力。
