Fiber Optic based Localized SPR for Nutrients Detection in Modern Agricultural Applications

Irfan Mohd Hanafi, Nur Hidayah Azeman, Mohd Hafiz Abu Bakar, Nur Afifah Ahmad Nazri, Rozita Sulaiman, A. A. A. Bakar
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Abstract

Detection of nutrients in the hydroponics system, particularly nitrogen, phosphorus, and potassium (NPK) are critical to ensure the good production of crops. Currently, nutrients are analyzed using spectroscopy and electrochemical techniques, which are tedious and sophisticated. This study was conducted to develop a localized surface plasmon resonance (LSPR) fiber optic sensor technique to measure how much content of these nutrients should be added in the soil to increase crop fertility. The main objectives of this study are to study the LSPR fiber sensor technology on NPK in hydroponic systems, to create a fiber optic sensor technique for measuring NPK in hydroponic systems, and finally to characterize the performance of fiber optic sensors for measuring NPK in hydroponic systems. The utilization of the sensing materials, chitosan in this work is to improve the sensitivity feature of the sensor. Chitosan is coated on the surface of the tapered optical fiber prior to the LSPR NPK detection. The results of the absorption spectra will be visible at the end of the experiment where the obtained data are analyzed using SpectraSuite software. The results show that a good linearity was obtained when used AgNP/chitosan as the sensing material with the sensitivity of 0.041 nm ppm-1 in comparison to that of AgNP with the sensitivity of 0.039 nm ppm-1. A better limit of detection (LOD) and limit of quantification (LOQ) was also observed for AgNP/chitosan which are 35.61 ppm and 107.91 ppm, respectively. Meanwhile, AgNP exhibits LOD and LOQ of 106.16 ppm and 494.43 ppm, respectively. It is expected that this work will be a good contributor to the United Nations Sustainable Development Goals (UN SDG), No. 2: Zero Hunger.
光纤定位SPR在现代农业养分检测中的应用
水培系统中营养物质的检测,特别是氮、磷和钾(NPK)的检测是确保作物良好生产的关键。目前,对营养物质的分析主要采用光谱学和电化学技术,这些技术繁琐而复杂。本研究旨在开发一种局部表面等离子体共振(LSPR)光纤传感器技术,以测量土壤中应添加多少这些营养物质以提高作物肥力。本研究的主要目的是研究水培系统中NPK的LSPR光纤传感器技术,建立水培系统中NPK测量的光纤传感器技术,最后表征水培系统中NPK测量的光纤传感器的性能。利用壳聚糖作为传感材料,是为了提高传感器的灵敏度特性。在LSPR检测NPK之前,在锥形光纤表面涂覆壳聚糖。在实验结束时,使用SpectraSuite软件分析获得的数据,吸收光谱的结果将是可见的。结果表明,以AgNP/壳聚糖为传感材料,灵敏度为0.041 nm ppm-1,与灵敏度为0.039 nm ppm-1的AgNP相比,具有良好的线性关系。AgNP/壳聚糖具有较好的检出限和定量限,分别为35.61 ppm和107.91 ppm。AgNP的LOD和LOQ分别为106.16 ppm和494.43 ppm。预计这项工作将为联合国可持续发展目标(UN SDG)第2号:零饥饿做出良好贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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