Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (8): 1075-1079.DOI: 10.12068/j.issn.1005-3026.2019.08.003

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Reflective Fiber Optic SPR Sensor for Nitrate Concentration Measurement

LUY Jiang-tao, WANG Xiao-jun, E Si-yu, ZHANG Ya-nan   

  1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2018-08-21 Revised:2018-08-21 Online:2019-08-15 Published:2019-09-04
  • Contact: ZHANG Ya-nan
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Abstract: A reflective fiber optical sensor based on surface plasmon resonance(SPR)is proposed for measuring nitrate concentration. The reflective structure sensor is coated with gold film to excite SPR. A copper nanoparticles/carbon nanotube(Cu-NPs/CNT)film is prepared as a sensitive film for nitrate concentration measurement. When the concentration of nitrate changes, the concentration of ammonia catalyzed by copper adsorbed on the CNT also changes, thus causing the refractive index of the CNT to change. The change of the refractive index leads to the shift of SPR resonance dip, so that nitrate concentration can be measured. The experimental results show that the sensor had an average sensitivity of 14.14nm/lg[c/(mol·L-1)] in the low concentration range. This sensor is easy to package and can be used for long-distance measurement, and will have potential applications in biochemical parametric measurement.

Key words: fiber optical sensing, SPR, CNT, Cu-NPs, nitrate concentration measurement

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