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UIO-66-(OH)₂-Modified Optical Fiber SPR Sensor for Boric Acid Concentration Detection | IEEE Journals & Magazine | IEEE Xplore

UIO-66-(OH)₂-Modified Optical Fiber SPR Sensor for Boric Acid Concentration Detection


Abstract:

It is important to detect whether the concentration of boric acid in industrial wastewater meets the discharge limit. Conventional chemical detection methods are complex,...Show More

Abstract:

It is important to detect whether the concentration of boric acid in industrial wastewater meets the discharge limit. Conventional chemical detection methods are complex, time-consuming, and difficult to operate. This article modifies the metal organic frameworks (MOFs) material UIO-66-(OH)2 on the surface of the gold film of the optical fiber SPR sensor, achieving specific detection of low concentration boric acid. The metallic-like properties of this material enhance the SPR phenomenon, increasing the refractive index sensitivity of the sensor to 4706.67 nm/RIU, which is 87% higher than before modification. In addition, a large number of hydroxyl and phenolic hydroxyl groups on the surface of UIO-66-(OH)2 material form coordination bonds to specifically adsorb boric acid, achieving specific detection of boric acid concentration with a sensitivity of 2.807 nm/lg(pM/mL) and a detection limit of 124.06 pM/mL. The boric acid concentration detection SPR sensor proposed in this article provides a new method for detecting microsubstances by material-modified optical fiber SPR sensor.
Published in: IEEE Sensors Journal ( Volume: 25, Issue: 3, 01 February 2025)
Page(s): 4641 - 4646
Date of Publication: 19 December 2024

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