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Volatile Organic Compounds Detection with Optical Fiber Sensors
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Volatile Organic Compounds Detection with Optical Fiber Sensors

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 8438

Special Issue Editor

Dr. Marta S. Ferreira

E-Mail Website
Guest Editor
i3N and Department of Physics, University of Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal
Interests: optical fiber sensors; microstructured optical fibers; optofluidics; interferometers; physical and chemical sensing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The detection of volatile organic compounds (VOCs) is a critical aspect in many fields. For instance, in many industries, these compounds present a high environmental impact, and their emissions need to be carefully controlled. On the other hand, in the food and beverage industry, these can be indicators of the products’ quality. Their presence can also be associated with environmental contamination, poor air quality, or even with certain human diseases. Many optical fiber-based sensors have been proposed in the last years to detect VOCs, and this is still a very active research field.

This forthcoming Special Issue invites contributions regarding the research and development of new optical fiber sensors for the detection of VOCs, aiming at an advancement of the current state of the art. Short communications, original research experimental and theoretical papers, and review articles are welcomed for this Special Issue. These contributions can focus on, but are not limited to, the following topics: 

  • VOCs sensors based on new optical fiber geometries;
  • Interferometric fiber sensors;
  • Fiber gratings-based sensors;
  • Optofluidic fiber sensors;
  • Fiber sensors based on Vernier effect;
  • Sensors based on whispering gallery modes;
  • Detection of a single or multiple VOCs;
  • Active or passive fiber sensors;
  • New coating materials;
  • Advanced sensing configurations.

Dr. Marta S. Ferreira
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Optical fiber sensors
  • Volatile organic compounds
  • Chemical sensors
  • Interferometry
  • Fiber gratings
  • Advanced sensing configurations

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Published Papers (2 papers)

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Research

11 pages, 2440 KiB  
Article
Optical Fiber Sensor for Monitoring the Evaporation of Ethanol–Water Mixtures
by Diana Pereira, Jörg Bierlich, Jens Kobelke, Vanda Pereira and Marta S. Ferreira
Sensors 2022, 22(15), 5498; https://doi.org/10.3390/s22155498 - 23 Jul 2022
Cited by 6 | Viewed by 2277
Abstract
An inline optical fiber sensor is proposed to monitor in real time the evaporation process of ethanol–water binary mixtures. The sensor presents two interferometers, a cladding modal interferometer (CMI) and a Mach–Zehnder interferometer (MZI). The CMI is used to acquire the variations in [...] Read more.
An inline optical fiber sensor is proposed to monitor in real time the evaporation process of ethanol–water binary mixtures. The sensor presents two interferometers, a cladding modal interferometer (CMI) and a Mach–Zehnder interferometer (MZI). The CMI is used to acquire the variations in the external medium refractive index, presenting a maximum sensitivity of 387 nm/RIU, and to attain the variation in the sample concentration profile, while the MZI monitors temperature fluctuations. For comparison purposes, an image analysis is also conducted to obtain the droplet profile. The sensor proposed in this work is a promising alternative in applications where a rigorous measurement of volatile organic compound concentrations is required, and in the study of chemical and physical properties related to the evaporation process. Full article
(This article belongs to the Special Issue Volatile Organic Compounds Detection with Optical Fiber Sensors)
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13 pages, 5269 KiB  
Article
Volatile Organic Compound Vapour Measurements Using a Localised Surface Plasmon Resonance Optical Fibre Sensor Decorated with a Metal-Organic Framework
by Chenyang He, Liangliang Liu, Sergiy Korposh, Ricardo Correia and Stephen P. Morgan
Sensors 2021, 21(4), 1420; https://doi.org/10.3390/s21041420 - 18 Feb 2021
Cited by 29 | Viewed by 5113
Abstract
A tip-based fibreoptic localised surface plasmon resonance (LSPR) sensor is reported for the sensing of volatile organic compounds (VOCs). The sensor is developed by coating the tip of a multi-mode optical fibre with gold nanoparticles (size: 40 nm) via a chemisorption process and [...] Read more.
A tip-based fibreoptic localised surface plasmon resonance (LSPR) sensor is reported for the sensing of volatile organic compounds (VOCs). The sensor is developed by coating the tip of a multi-mode optical fibre with gold nanoparticles (size: 40 nm) via a chemisorption process and further functionalisation with the HKUST-1 metal–organic framework (MOF) via a layer-by-layer process. Sensors coated with different cycles of MOFs (40, 80 and 120) corresponding to different crystallisation processes are reported. There is no measurable response to all tested volatile organic compounds (acetone, ethanol and methanol) in the sensor with 40 coating cycles. However, sensors with 80 and 120 coating cycles show a significant redshift of resonance wavelength (up to ~9 nm) to all tested volatile organic compounds as a result of an increase in the local refractive index induced by VOC capture into the HKUST-1 thin film. Sensors gradually saturate as VOC concentration increases (up to 3.41%, 4.30% and 6.18% in acetone, ethanol and methanol measurement, respectively) and show a fully reversible response when the concentration decreases. The sensor with the thickest film exhibits slightly higher sensitivity than the sensor with a thinner film. The sensitivity of the 120-cycle-coated MOF sensor is 13.7 nm/% (R2 = 0.951) with a limit of detection (LoD) of 0.005% in the measurement of acetone, 15.5 nm/% (R2 = 0.996) with an LoD of 0.003% in the measurement of ethanol and 6.7 nm/% (R2 = 0.998) with an LoD of 0.011% in the measurement of methanol. The response and recovery times were calculated as 9.35 and 3.85 min for acetone; 5.35 and 2.12 min for ethanol; and 2.39 and 1.44 min for methanol. The humidity and temperature crosstalk of 120-cycle-coated MOF was measured as 0.5 ± 0.2 nm and 0.5 ± 0.1 nm in the humidity range of 50–75% relative humidity (RH) and temperature range of 20–25 °C, respectively. Full article
(This article belongs to the Special Issue Volatile Organic Compounds Detection with Optical Fiber Sensors)
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