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

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-12-17 DOI:10.1021/acs.nanolett.4c04620

Ying Chen, Shiqi Hu, Chao Shen, Lingling Zhang, Chu Yi, Yaofei Chen, Gui-Shi Liu, Lei Chen, Zhe Chen, Yunhan Luo

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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^–1 and remarkable pH sensitivity of −64.04 and −30.63 nm pH^–1 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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利用双曲超材料（HMMs）和 pH 值敏感水凝胶设计了一种光纤表面等离子体共振（SPR）传感器，用于检测汗液中的 pH 值。可分散调谐的 HMM 使传感器能够超越光纤固有的结构限制，并提高其折射率（RI）灵敏度。 pH 敏感水凝胶在不同溶液 pH 条件下，由于羧基的电离程度不同而表现出不同的溶胀行为，从而导致显著的 RI 变化。该传感器的 RI 灵敏度高达 6963.64 nm RIU-1，在 2.7 至 4.7 和 4.7 至 7.5 的 pH 范围内，pH 灵敏度分别为 -64.04 nm 和 -30.63 nm pH-1。与其他三种汗液成分（尿素、氯化钠和葡萄糖）的灵敏度相比，该传感器具有卓越的 pH 选择性。此外，该传感器在运行期间和长期储存后都能保持良好的稳定性。相信该传感器在健康监测、医疗诊断、疾病治疗等方面具有潜力。

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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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.