Enhanced VOCs and Humidity Detection via DTP-Regulated and Surface-Modified Tapered Seven-Core Fiber Sensors

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-10-01 DOI:10.1016/j.snb.2025.138902

Wanlai Zhu, Guorui Zhou, Zao Yi, Hui You, Dongying Wang

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引用次数: 0

Abstract

Fiber optic sensors exhibit unique advantages in environmental monitoring and biomedicine, yet conventional designs face limitations in detection limits and sensitivity. To overcome these challenges, a tapered seven core fiber (SCF) sensing system based on dispersion turning point (DTP) modulation and surface modification enhancement is innovatively proposed in this work. The wavelength sensitivity near the DTP approaches infinity, and the DTP can also serve as an intrinsic self-referencing point during sensing. In humidity (1-92%RH) sensing, the bare fiber achieved a wavelength sensitivity of 0.2025 nm/%RH and an intensity sensitivity of 0.086 dB/%RH near the DTP. In volatile organic compounds (VOCs) detection, silica sol-gel surface modification amplified the response to polar molecules by 2-4 times, enabling ppb-level pollutant sensing. Specifically, the maximum wavelength sensitivity for ethyl acetate exceeded 1094.2 pm/ppm. This study provides a novel integrated solution for the detection of low-concentration VOCs, offering broad application prospects.

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通过dtp调节和表面改性锥形七芯光纤传感器增强VOCs和湿度检测

光纤传感器在环境监测和生物医学领域具有独特的优势，但传统设计在检测限和灵敏度方面存在局限性。为了克服这些挑战，本文创新性地提出了一种基于色散拐点（DTP）调制和表面改性增强的锥形七芯光纤（SCF）传感系统。DTP附近的波长灵敏度接近无穷大，并且在传感过程中，DTP也可以作为一个固有的自参考点。在湿度（1-92%RH）传感中，光纤在DTP附近的波长灵敏度为0.2025 nm/%RH，强度灵敏度为0.086 dB/%RH。在挥发性有机化合物（VOCs）检测中，二氧化硅溶胶-凝胶表面修饰将对极性分子的响应放大了2-4倍，实现了ppb级污染物的检测。其中，乙酸乙酯的最大波长灵敏度超过1094.2 pm/ppm。本研究为低浓度VOCs的检测提供了一种新颖的集成解决方案，具有广阔的应用前景。

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

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.