High sensitivity optical fiber sensors for simultaneous measurement of methanol and ethanol

Liu, Dejun, Kumar, Rahul, Wei, Fangfang, Han, Wei, Mallik, Arun Kumar, Yuan, Jinhui, Wan, Shengpeng, He, Xingdao, Kang, Zhe, Li, Feng, Yu, Chongxiu, Farrell, Gerald, Semenova, Yuliya and Wu, Qiang (2018) High sensitivity optical fiber sensors for simultaneous measurement of methanol and ethanol. Sensors and Actuators B: Chemical, 271. pp. 1-8. ISSN 0925-4005

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Official URL: http://dx.doi.org/10.1016/j.snb.2018.05.106

Abstract

High sensitivity volatile organic compounds (VOCs) sensors based on a tapered small core single mode fiber (TSCSMF) and a microfiber coupler (MFC) are reported. The TSCSMF had a waist diameter of ∼5.1 μm and the MFC had a waist diameter of ∼1.9 μm each and both were fabricated using a customized microheater brushing technique. Silica based materials containing immobilized Nile red prepared by sol-gel method with two different recipes (recipe I and recipe II) are investigated. Initially recipe I based coating materials were applied to the surfaces of the TSCSMF and MFC. The experimental results show that the sensor based on an MFC shows much better sensitivities of −0.130 nm/ppm and −0.036 nm/ppm to ethanol and methanol than those of the TSCSMF based sensor. The corresponding minimum detectable concentration change of the MFC based sensor are calculated to be ∼77 ppb and ∼281 ppb to ethanol and methanol respectively. Both sensors are demonstrated fast response times of less than 5 minutes, while the recovery times varied from 7 minutes to 12 minutes. In addition, another TSCSMF based sample (∼7.0 μm) coated with a mixed layer of sol silica and Nile red prepared by recipe II was fabricated to achieve simultaneous measurement of ethanol and methanol, employing a second-order matrix approach.

Item Type: Article
Uncontrolled Keywords: Volatile organic compounds, optical fiber sensor, tapered fiber, sol-gel silica, Nile red
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 21 May 2018 08:45
Last Modified: 19 May 2019 03:30
URI: http://nrl.northumbria.ac.uk/id/eprint/34282

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