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

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 min, while the recovery times varied from 7 min to 12 min. 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.

[1]  Chi Chiu Chan,et al.  PDMS-coated fiber volatile organic compounds sensors. , 2016, Applied optics.

[2]  R. P. Tatam,et al.  Multi-parameter measurements using optical fibre long period gratings for indoor air quality monitoring , 2017, 2017 25th Optical Fiber Sensors Conference (OFS).

[3]  Shiquan Tao,et al.  Optical fiber ammonia sensing probes using reagent immobilized porous silica coating as transducers , 2006 .

[4]  Y. Rao,et al.  Highly sensitive and selective fiber-optic Fabry-Perot volatile organic compounds sensor based on a PMMA film , 2017 .

[5]  Chun-liu Zhao,et al.  Multipoint chemical vapor measurement by zeolite thin film-coated Fresnel reflection-based fiber sensors with an Array-Waveguide Grating , 2016 .

[6]  C. Reichardt,et al.  Solvatochromic Dyes as Solvent Polarity Indicators , 1994 .

[7]  Guillermo Orellana and David Haigh.  New Trends in Fiber-Optic Chemical and Biological Sensors , 2008 .

[8]  Qiang Wu,et al.  High sensitivity refractive index sensor based on a tapered small core single-mode fiber structure. , 2015, Optics letters.

[9]  Pietro Siciliano,et al.  Investigation on alcohol vapours/TiO2 nanocrystal thin films interaction by SPR technique for sensing application , 2004 .

[10]  Ignacio R. Matias,et al.  Detection of volatile organic compound vapors by using a vapochromic material on a tapered optical fiber , 2000 .

[11]  Qiang Wu,et al.  High sensitivity sol-gel silica coated optical fiber sensor for detection of ammonia in water. , 2016, Optics express.

[12]  J. Garrido,et al.  Silica xerogels of tailored porosity as support matrix for optical chemical sensors. Simultaneous effect of pH, ethanol:TEOS and water:TEOS molar ratios, and synthesis temperature on gelation time, and textural and structural properties , 2007 .

[13]  Nikolay N. Nedyalkov,et al.  Optical sensing of ammonia using ZnO nanostructure grown on a side-polished optical-fiber , 2010 .

[14]  Byoung-Ho Kang,et al.  Fiber-optic pulse width modulation sensor for low concentration VOC gas , 2013 .

[15]  Abraham Katzir,et al.  High-sensitivity infrared attenuated total reflectance sensors for in situ multicomponent detection of volatile organic compounds in water , 2016, Nature Protocols.

[16]  Tianmo Liu,et al.  Gas sensing mechanism and properties of Ce-doped SnO2 sensors for volatile organic compounds , 2012 .

[17]  Banshi D. Gupta,et al.  Surface plasmon resonance based fiber optic ammonia gas sensor using ITO and polyaniline , 2012 .

[18]  Bo Li,et al.  Volatile organic compound detection using nanostructured copolymers. , 2006, Nano letters.

[19]  Chongxiu Yu,et al.  High Sensitivity Ammonia Gas Sensor Based on a Silica-Gel-Coated Microfiber Coupler , 2017, Journal of Lightwave Technology.

[20]  J. F. Deye,et al.  Nile Red as a solvatochromic dye for measuring solvent strength in normal liquids and mixtures of normal liquids with supercritical and near critical fluids , 1990 .

[21]  Jo Dewulf,et al.  Sample preparation for the analysis of volatile organic compounds in air and water matrices. , 2007, Journal of chromatography. A.

[22]  Yuliya Semenova,et al.  A comprehensive analysis verified by experiment of a refractometer based on an SMF28–small-core singlemode fiber (SCSMF)–SMF28 fiber structure , 2011 .

[23]  F. Arregui,et al.  Lossy mode resonance optical fiber sensor to detect organic vapors , 2013 .

[24]  Carles Cané,et al.  Discrimination of volatile compounds through an electronic nose based on ZnO SAW sensors , 2007 .

[25]  Vlastimil Matejec,et al.  Detection of aromatic hydrocarbons in air and water by using xerogel layers coated on PCS fibers excited by an inclined collimated beam , 2003 .

[26]  J. Garrido,et al.  Effects of aging and drying conditions on the structural and textural properties of silica gels , 2007 .

[27]  Chia-Jung Lu,et al.  Surface modification on silver nanoparticles for enhancing vapor selectivity of localized surface plasmon resonance sensors , 2009 .

[28]  V. Matejec,et al.  Characterization of sol-gel derived coatings on optical fibers , 1992 .

[29]  G. Fitzgerald,et al.  'I. , 2019, Australian journal of primary health.

[30]  A. Snyder.  Coupled-Mode Theory for Optical Fibers , 1972 .

[31]  Neal A. Rakow,et al.  A colorimetric sensor array for odour visualization , 2000, Nature.

[32]  Shin-Won Kang,et al.  A High Sensitivity and Wide Dynamic Range Fiber-Optic Sensor for Low-Concentration VOC Gas Detection , 2014, Sensors.

[33]  J. Garrido,et al.  Effects of the porous texture and surface chemistry of silica xerogels on the sensitivity of fiber-optic sensors toward VOCs , 2016 .

[34]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.