用于检测痕量铅离子的功能化反射结构光纤干涉传感器

引用本文: 赵可, 刘震, 刘露遥, 余长源, 潘竞顺, 黄旭光. 用于检测痕量铅离子的功能化反射结构光纤干涉传感器[J]. 物理化学学报, 2024, 40(4): 230402. doi: 10.3866/PKU.WHXB202304029 shu

Citation: Ke Zhao, Zhen Liu, Luyao Liu, Changyuan Yu, Jingshun Pan, Xuguang Huang. Functionalized Reflective Structure Fiber-Optic Interferometric Sensor for Trace Detection of Lead Ions[J]. Acta Physico-Chimica Sinica, 2024, 40(4): 230402. doi: 10.3866/PKU.WHXB202304029 shu

用于检测痕量铅离子的功能化反射结构光纤干涉传感器

赵可 ^1, ,
刘震 ^1, ,
刘露遥 ^1, ,
余长源 ^{2,
,} ,
潘竞顺 ^{1,2,
,} ,
黄旭光 ^{1,
,}

1.
华南师范大学, 广东省纳米光子功能材料与器件重点实验室, 广州 510006;
2.
香港理工大学电子与信息工程系, 香港 999077

通讯作者: 余长源,Email:changyuan.yu@polyu.edu.hk; 潘竞顺,Email:panjsh3@mail2.sysu.edu.cn; 黄旭光,Email:huangxg@scnu.edu.cn

基金项目:
深圳-香港-澳门科技计划C(SGDX2020110309520303),国家重点研发计划(2021YFB2900900)和国家自然科学基金(62105379)资助项目

摘要: 铅离子(Pb²⁺)是日常生活中常接触的有毒重金属污染物之一。本研究开发了一种新型反射式光纤干涉传感器，用于检测痕量铅离子。该传感器结构由单模光纤、无芯光纤和细芯光纤(TCF)依次拼接而成。TCF的包层被氢氟酸部分腐蚀并涂覆功能化的水凝胶传感膜。该传感膜选用甲基丙烯酸2-羟基乙酯(2-HEMA)作为识别单体。2-HEMA中的氧原子能与Pb²⁺发生配体-受体相互作用，形成“-O-Pb-O-”交联结构，从而改变TCF的新包层有效折射率。因此，可以通过观察反射光谱中光信号的变化来检测水溶液中Pb²⁺的浓度。所提出的传感器具有很高的检测灵敏度(1.926×10⁹ nm∙mol⁻¹∙L)，其检测极限为4.14 ppt (1 ng∙L⁻¹ = 1 ppt)，比世界卫生组织(WHO)规定的饮用水中Pb²⁺ (10 ppb，1 μg∙L⁻¹= 1 ppb)浓度低1000倍。此外，利用一个方程组实现了该传感器的温度自校准功能，成功地消除了环境温度的干扰。由于该传感器良好的特异性、稳定性以及反射式结构，非常便于实时远程检测，为环境和人类健康监测提供了广阔的前景。

关键词:

English

Functionalized Reflective Structure Fiber-Optic Interferometric Sensor for Trace Detection of Lead Ions

Ke Zhao ^1, ,
Zhen Liu ^1, ,
Luyao Liu ^1, ,
Changyuan Yu ^{2,
,} ,
Jingshun Pan ^{1,2,
,} ,
Xuguang Huang ^{1,
,}

1.
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510006, China;
2.
Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China

Corresponding author: Changyuan Yu, ; Jingshun Pan, ; Xuguang Huang,

Received Date: 17 April 2023
Accepted Date: 23 May 2023
Revised Date: 22 May 2023
Available Online: 08 June 2023
Fund Project:
The project was supported by the Shenzhen-HK-Macao Science and Technology Plan C (SGDX2020110309520303), the National Key Research and Development Program of China (2021YFB2900900) and the National Natural Science Foundation of China (62105379).

Abstract: Lead ions (Pb²⁺) are among the most prevalent toxic heavy-metal pollutants in daily human life, particularly in children and pregnant women. Although atomic absorption spectroscopy is the most commonly used method owing to its accuracy and reliability, it requires complex sample preparation and expensive equipment. Therefore, efficient detection of Pb²⁺ is currently the focus of optical sensing research. In this study, we develop a reflective fiber-optic interferometric sensor to detect trace levels of lead ions. The sensor is composed of a single-mode fiber, no-core fiber (NCF), and thin-core fiber (TCF). When light from the broadband light source is transmitted to the sensor via ports 1 and 2 of the fiber optic circulator, the light diverges and propagates forward in the NCF. Owing to the fiber-core mismatch of different optical fibers, the beams can excite the core and cladding modes in the TCF. When the beams are reflected back into the NCF, the core and cladding modes can effectively interfere in the NCF due to their optical path differences. Subsequently, the light signal is recorded by an optical spectrum analyzer through port 3 of the circulator. The TCF’s cladding is partially etched and coated with a functionalized hydrogel-sensing film made of 2-hydroxyethyl methacrylate (2-HEMA) as the recognition monomer. The oxygen atoms in the 2-HEMA are specifically matched with Pb²⁺ to form “-O-Pb-O-” cross-linked structures. Therefore, the absorption of Pb²⁺ by the hydrogel can change the effective refractive index of a new cladding of the TCF, formed by the sensing film and the TCF’s original cladding, thereby the Pb²⁺ concentration is detected by the change of the optical signal. Owing to the trace levels of the detected Pb²⁺ in aqueous solutions (in the ppt range), we employ an equation system to eliminate temperature interference and ensure accurate detection results under environmental temperature fluctuations. Additionally, for the same sensing length, the concentration sensitivity of fiber-optic sensors with reflective structures is twice that of the transmission structures, and the reflective structure is convenient for real-time remote detection. The experimental results show that the optimal sensitivity of the sensor is 1.926×10⁹ nm∙mol⁻¹∙L, and its detection limit can reach 2.0×10⁻¹¹ mol∙L⁻¹ (4.14 ppt, 1 ng∙L⁻¹ = 1 ppt), which is far lower than the standard (10 ppb, 1 μg∙L⁻¹ = 1 ppb) set by the World Health Organization. Moreover, the sensor exhibits good stability, specificity, and a wide detection range. Consequently, the designed reflective fiber optic sensor can provide broad prospects for environmental and human health monitoring.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

用于检测痕量铅离子的功能化反射结构光纤干涉传感器

通讯作者: 余长源,Email:changyuan.yu@polyu.edu.hk; 潘竞顺,Email:panjsh3@mail2.sysu.edu.cn; 黄旭光,Email:huangxg@scnu.edu.cn

English

Functionalized Reflective Structure Fiber-Optic Interferometric Sensor for Trace Detection of Lead Ions

Corresponding author: Changyuan Yu, ; Jingshun Pan, ; Xuguang Huang,

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

计量

通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

用于检测痕量铅离子的功能化反射结构光纤干涉传感器

通讯作者: 余长源,Email:changyuan.yu@polyu.edu.hk; 潘竞顺,Email:panjsh3@mail2.sysu.edu.cn; 黄旭光,Email:huangxg@scnu.edu.cn

English

Functionalized Reflective Structure Fiber-Optic Interferometric Sensor for Trace Detection of Lead Ions

Corresponding author: Changyuan Yu, ; Jingshun Pan, ; Xuguang Huang,

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

计量

文章相关

通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs