A Fiber optics based surface enhanced Raman spectroscopy sensor for chemical and biological sensing

IF 5.4 Q1 CHEMISTRY, ANALYTICAL

Sensing and Bio-Sensing Research Pub Date : 2024-09-24 DOI:10.1016/j.sbsr.2024.100686

Jiayu Liu , Bohong Zhang , Amjed Abdullah , Sura A. Muhsin , Jie Huang , Mahmoud Almasri

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Abstract

This paper investigates an innovative surface-enhanced Raman scattering (SERS) sensor developed on a side-polished multimode optical fiber core. The optical fiber was integrated into specifically designed 3-dimensional printed mold, where manual polishing of the fiber took place. Microsphere Photolithography (MPL) techniques was employed to pattern periodic nanoantenna arrays on the polished surface, incorporating multiple disk diameters at a fixed periodicity. Subsequent gold deposition/lift-off were carried out to transfer the pattern from the photoresist to the fiber core, resulting in highly periodic hexagonal closed pack (HCP) arrays of nanodisks. These arrays can significantly enhance the SERS signal intensity compared to that of the fiber tip. The sensor's performance was demonstrated using various concentrations of Rhodamine 6G (R6G) dye ranging from 10⁻⁵ to 10⁻⁹ M as a function of disk diameter and sensing surface area. The resulting spectra revealed characteristic peak positions that aligned well with the fingerprint Raman spectra of R6G. The results demonstrates that the sensitivity is 10⁻⁹ M for the sensor with an 800 nm disk diameter.

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用于化学和生物传感的基于光纤的表面增强拉曼光谱传感器

本文研究了一种在侧面抛光的多模光纤芯上开发的创新型表面增强拉曼散射（SERS）传感器。光纤被集成到专门设计的三维印刷模具中，在模具中对光纤进行手工抛光。采用微球光刻（MPL）技术在抛光表面上绘制周期性纳米天线阵列图案，以固定的周期整合多个圆盘直径。随后进行金沉积/剥离，将图案从光刻胶转移到光纤纤芯，从而形成高度周期性的六边形封闭包（HCP）纳米盘阵列。与光纤尖端相比，这些阵列能显著增强 SERS 信号强度。利用罗丹明 6G (R6G) 染料的不同浓度（10-5 至 10-9 M），作为圆盘直径和传感表面积的函数，展示了传感器的性能。产生的光谱显示出特征峰位置，与 R6G 的指纹拉曼光谱非常吻合。结果表明，圆盘直径为 800 nm 的传感器的灵敏度为 10-9 M。

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来源期刊

Sensing and Bio-Sensing Research Engineering-Electrical and Electronic Engineering

CiteScore

10.70

自引率

3.80%

发文量

审稿时长

87 days

期刊介绍： Sensing and Bio-Sensing Research is an open access journal dedicated to the research, design, development, and application of bio-sensing and sensing technologies. The editors will accept research papers, reviews, field trials, and validation studies that are of significant relevance. These submissions should describe new concepts, enhance understanding of the field, or offer insights into the practical application, manufacturing, and commercialization of bio-sensing and sensing technologies. The journal covers a wide range of topics, including sensing principles and mechanisms, new materials development for transducers and recognition components, fabrication technology, and various types of sensors such as optical, electrochemical, mass-sensitive, gas, biosensors, and more. It also includes environmental, process control, and biomedical applications, signal processing, chemometrics, optoelectronic, mechanical, thermal, and magnetic sensors, as well as interface electronics. Additionally, it covers sensor systems and applications, µTAS (Micro Total Analysis Systems), development of solid-state devices for transducing physical signals, and analytical devices incorporating biological materials.