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<p>This paper demonstrates a cost-effective approach for the detection and quantification of fluoride ions using a U-bent plastic optical fiber surface-modified with curcumin-conjugated gold nanoparticles (AuNPs). The U-bent geometry significantly enhances the interaction between the evanescent field and the surrounding medium, thereby increasing the probe’s sensitivity. Curcumin, a natural dye known for its strong binding affinity toward both gold nanoparticles and fluoride ions, acts as a highly selective sensing agent. Upon reacting with fluoride ions, curcumin forms a stable complex that induces a distinct color change and alters the local refractive index (R.I.) of the medium. By illuminating the U-bent probe with a suitable wavelength, this change in R.I. is reflected in the transmitted light intensity, allowing for correlation with fluoride concentration via absorbance measurements. The sensor exhibits a linear response over the range of 0–1&#xa0;mg/L, with a sensitivity of 0.62 A.U/mg/L and a limit of detection (LOD) of 0.1&#xa0;mg/L. This chemistry-induced, absorbance-based detection approach eliminates the need for complex and expensive instrumentation, making it well-suited for field deployment. In addition to its high sensitivity and selectivity, the sensor is rapid, eco-friendly, and scalable for commercial applications. Its simplicity in design and seamless integrability with other electronic systems make it as a promising sought after technology.</p>

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Detection of fluoride ion using U-bent optical fiber functionalized with curcumin-tagged gold nanoparticles

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • P. Vayunandana Kishore,
  • N. Rajeswara Rao,
  • B. M. Pratima,
  • D. Vijaya Lakshmi,
  • A. Suneel Kumar,
  • Muthaiyan Xavier Suresh

摘要

This paper demonstrates a cost-effective approach for the detection and quantification of fluoride ions using a U-bent plastic optical fiber surface-modified with curcumin-conjugated gold nanoparticles (AuNPs). The U-bent geometry significantly enhances the interaction between the evanescent field and the surrounding medium, thereby increasing the probe’s sensitivity. Curcumin, a natural dye known for its strong binding affinity toward both gold nanoparticles and fluoride ions, acts as a highly selective sensing agent. Upon reacting with fluoride ions, curcumin forms a stable complex that induces a distinct color change and alters the local refractive index (R.I.) of the medium. By illuminating the U-bent probe with a suitable wavelength, this change in R.I. is reflected in the transmitted light intensity, allowing for correlation with fluoride concentration via absorbance measurements. The sensor exhibits a linear response over the range of 0–1 mg/L, with a sensitivity of 0.62 A.U/mg/L and a limit of detection (LOD) of 0.1 mg/L. This chemistry-induced, absorbance-based detection approach eliminates the need for complex and expensive instrumentation, making it well-suited for field deployment. In addition to its high sensitivity and selectivity, the sensor is rapid, eco-friendly, and scalable for commercial applications. Its simplicity in design and seamless integrability with other electronic systems make it as a promising sought after technology.