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Spectroscopic Chemical Sensing
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Spectroscopic Chemical Sensing

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

Deadline for manuscript submissions: closed (19 April 2024) | Viewed by 1335

Special Issue Editors

Dr. José Manuel M. M. de Almeida

E-Mail Website
Guest Editor
1. CAP/INESC TEC—Technology and Science and FCUP—Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
2. Department of Physics, School of Sciences and Technology, University de Trás-os-Montes e Alto Douro, Vila Real, Portugal
Interests: porto optical sensors; integrated optics; spectroscopy and biophysics
Special Issues, Collections and Topics in MDPI journals
Dr. Luís Carlos Costa Coelho

E-Mail Website
Guest Editor
Institute for Systems and Computer Engineering, Technology and Science, Porto, Portugal
Interests: bio and chemical sensors; fiber optic sensors; spectroscopy; environmental monitoring; food quality
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Spectroscopy is of paramount importance in sensing for the detection of chemical components or the quantification of their concentration.

Spectroscopic sensing depends on phenomena such as electronic absorption and emission, elastic scattering and reflection, inelastic scattering (Raman and Compton scattering) and nuclear magnetic resonance (NMR), among many others.

The objective of this Special Issue is to present the advances in fundamental research and the development of technologies, including different sensing mechanisms and implementations, as well as innovative specific applications.

Reviews must offer a critical overview of the state-of-the-art fundamentals, technologies, and applications that are pertinent to spectroscopic chemical sensing.

Topics include, but are not limited to, the following:

  • Complexity matrixes, including biological systems and biomedical and food industry applications;
  • Harsh environments, including electromagnetic interference, ionizing radiation, high pressure and vibration and extreme temperatures;
  • Remote sensing measurements;
  • Natural environment monitoring, including the atmosphere and oceans.

Dr. José Manuel M. M. de Almeida
Dr. Luís Carlos Costa Coelho
Guest Editors

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

  • chemical sensors
  • biosensors
  • harsh environments
  • food safety
  • remote sensing
  • aquaculture

Published Papers (1 paper)

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Research

13 pages, 6503 KiB  
Article
Optical pH Sensor Based on a Long-Period Fiber Grating Coated with a Polymeric Layer-by-Layer Electrostatic Self-Assembled Nanofilm
by José M. Pereira, João P. Mendes, Bernardo Dias, José M. M. M. de Almeida and Luís C. C. Coelho
Sensors 2024, 24(5), 1662; https://0-doi-org.brum.beds.ac.uk/10.3390/s24051662 - 04 Mar 2024
Viewed by 942
Abstract
An optical fiber pH sensor based on a long-period fiber grating (LPFG) is reported. Two oppositely charged polymers, polyethylenimine (PEI) and polyacrylic acid (PAA), were alternately deposited on the sensing structure through a layer-by-layer (LbL) electrostatic self-assembly technique. Since the polymers are pH [...] Read more.
An optical fiber pH sensor based on a long-period fiber grating (LPFG) is reported. Two oppositely charged polymers, polyethylenimine (PEI) and polyacrylic acid (PAA), were alternately deposited on the sensing structure through a layer-by-layer (LbL) electrostatic self-assembly technique. Since the polymers are pH sensitive, their refractive index (RI) varies when the pH of the solution changes due to swelling/deswelling phenomena. The fabricated multilayer coating retained a similar property, enabling its use in pH-sensing applications. The pH of the PAA dipping solution was tuned so that a coated LPFG achieved a pH sensitivity of (6.3 ± 0.2) nm/pH in the 5.92–9.23 pH range. Only two bilayers of PEI/PAA were used as an overlay, which reduces the fabrication time and increases the reproducibility of the sensor, and its reversibility and repeatability were demonstrated by tracking the resonance band position throughout multiple cycles between different pH solutions. With simulation work and experimental results from a low-finesse Fabry–Perot (FP) cavity on a fiber tip, the coating properties were estimated. When saturated at low pH, it has a thickness of 200 nm and 1.53 ± 0.01 RI, expanding up to 310 nm with a 1.35 ± 0.01 RI at higher pH values, mostly due to the structural changes in the PAA. Full article
(This article belongs to the Special Issue Spectroscopic Chemical Sensing)
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