Chitosan/Poly (Acrylic Acid) Based Fiber-Optic Surface Plasmon Resonance Sensor for Cu2+ Ions Detection
Chitosan/Poly (Acrylic Acid) Based Fiber-Optic Surface Plasmon Resonance Sensor for Cu2+ Ions Detection
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DOI：
10.1109/jlt.2019.2901367
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发表时间：
2019-05-15
影响因子：
4.7
通讯作者：
Chan, Chi-Chiu
中科院分区：
文献类型：
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作者：
Ding, Zhe-Wen;Ravikumar, Raghunandhan;Chan, Chi-Chiu
提出了一种新型的光纤表面等离子体共振传感器，用于检测水环境中的铜离子。该传感器是通过在多模光纤之间拼接无芯光纤，然后用金膜和壳聚糖（CS）/聚丙烯酸（PAA）双层膜对传感器表面进行功能化而制成的。金膜用于激发表面等离子体波，并使传感器对CS/PAA双层膜上的Cu 2+离子吸收引起的折射率变化敏感。所提出的传感器的波长偏移和浓度之间的线性关系的Cu 2+离子从0.2到50 μ M和50到500 μ M，分别。还观察到，传感器的性能在低浓度下更好，并且其灵敏度随着浓度的增加而降低。此外，我们发现该传感器可以清楚地表达CS和PAA之间的自组装过程，这为我们提供了一种新的和简单的方法来研究CS和PAA之间的自组装。
A novel fiber-optic surface plasmon resonance sensor for detection of Cu2+ ions in an aquatic environment is proposed and experimentally demonstrated. The proposed sensor is fabricated by splicing no-core fiber between multimode fibers and then functionalizing the sensor surface with gold film and chitosan (CS)/poly(acrylic acid) (PAA) bilayers. The gold film is used to stimulate surface plasmon waves and make the sensor sensitive to changes in refractive index induced by Cu2+ ions absorption on the CS/PAA bilayers. The proposed sensor has a linear relationship between the wavelength shifts and the concentrations of Cu2+ ions from 0.2 to 50 mu M and 50 to 500 mu M, respectively. It is also observed that the sensor's performance is better at low concentrations, and its sensitivity decreases with the increasing concentration. Moreover, we find the proposed sensor can express the self-assembly process between CS and PAA clearly, which shows us a new and easy way to investigate the polyelectrolyte self-assembling.