Hyperbolic-Metamaterial-Based Optical Fiber SPR Sensor Enhanced by a Smart Hydrogel for Perspiration pH Measurements.

Nano Lett

Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Guangzhou 510632, P. R. China.

Published: December 2024

AI Article Synopsis

  • An optical fiber SPR sensor has been developed using hyperbolic metamaterials and pH-sensitive hydrogels to detect pH levels in sweat.
  • The sensor boasts high refractive index sensitivity (6963.64 nm RIU) and pH sensitivity, particularly in the ranges of 2.7-4.7 and 4.7-7.5.
  • It shows excellent pH selectivity over other sweat constituents like urea and glucose, along with strong operational stability, making it promising for health monitoring and medical applications.

Article Abstract

An optical fiber surface plasmon resonance (SPR) sensor, leveraging hyperbolic metamaterials (HMMs) and pH-sensitive hydrogels, has been devised for pH detection in perspiration. Dispersion-tunable HMMs enable the sensor to transcend the inherent structural constraints of an optical fiber and enhance its refractive index (RI) sensitivity. pH-sensitive hydrogels exhibit diverse swelling behaviors due to varying ionization degrees of carboxyl groups under different solution pH conditions, leading to a notable RI change. The sensor achieves a high RI sensitivity of 6963.64 nm RIU and remarkable pH sensitivity of -64.04 and -30.63 nm pH within the pH ranges of 2.7 to 4.7 and 4.7 to 7.5, respectively. Compared to the sensitivity of three other constituents in perspiration, namely, urea, sodium chloride, and glucose, the sensor demonstrates exceptional pH selectivity. Additionally, it maintains good stability during operation and after prolonged storage. It is believed that the sensor has potential in health monitoring, medical diagnosis, disease treatment, etc.

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Source
http://dx.doi.org/10.1021/acs.nanolett.4c04620DOI Listing

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