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Coatings
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Optical Sensing Materials and Coatings
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Optical Sensing Materials and Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Engineering for Energy Harvesting, Conversion, and Storage".

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 5900

Special Issue Editor

Dr. Zhenyang Ding

E-Mail Website
Guest Editor
School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, China
Interests: optical fiber sensing; optical coherence tomography
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Optical fibers or optical guides have been widely applied in optical biological and chemical sensor platforms due to their distinct advantages of being small in size and lightweight as well as possessing chemical inertness, multiplexed detection capability, and lacking electromagnetic interference, to name but a few. However, the optical fibers or optical guide themselves are only capable of sensing very few kinds of analytes with low sensitivity. To overcome this limitation, one efficient strategy is to combine responsive sensing materials and coatings that can change their properties, such as RI, absorption, conductivity, etc., in response to variations in their surrounding environment. Optical fibers or optical guides that can effectively detect changes in the environment surrounding the sensing materials and coatings can become effective biological and chemical sensors. Key technologies in this field include different kinds of sensing materials and coatings such as graphene, metals and metal oxides, carbon nanotubes, nanowires, nanoparticles, polymers, quantum dots, and so on. Methods to enhance light–matter interactions, central to sensors, include surface plasmon resonance (SPR), localized surface plasmon resonance (LSPR), and optical microfiber technologies. Combinations of technologies involving sensing materials with those of optical fibers, such as sensing of film on a fiber, self-assembled monolayer (SAM), layer-by-layer (LbL), self-assembly techniques, etc., are also of interest.

In particular, the topic of interest includes but is not limited to

  • Biological and chemical optical sensors
  • Sensing or functional materials and coatings for optical sensors
  • Light–matter interaction enhancement methods
  • Surface plasmon resonance (SPR)-based optical sensors
  • Localized surface plasmon resonance (LSPR)-based optical sensors
  • Optical microfiber fabrication
  • Combination of technologies of sensing materials with optical fibers

Prof. Dr. Zhenyang Ding
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. Coatings is an international peer-reviewed open access monthly 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.

Published Papers (2 papers)

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Research

12 pages, 2913 KiB  
Article
Fabrication of an Immobilized Polyelectrolite Complex (PEC) Membrane from Pectin-Chitosan and Chromoionophore ETH 5294 for pH-Based Fish Freshness Monitoring
by Eka Safitri, Zatul Omaira, Nazaruddin Nazaruddin, Irfan Mustafa, Sitti Saleha, Rinaldi Idroes, Binawati Ginting, Muhammad Iqhrammullah, Sagir Alva and Maria Paristiowati
Coatings 2022, 12(1), 88; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings12010088 - 13 Jan 2022
Cited by 4 | Viewed by 2380
Abstract
Considering the significance of its demand around the world, the accurate determination of fish freshness with a simple and rapid procedure has become an interesting issue for the fishing industry. Hence, we aimed to fabricate a new optical pH sensor based on a [...] Read more.
Considering the significance of its demand around the world, the accurate determination of fish freshness with a simple and rapid procedure has become an interesting issue for the fishing industry. Hence, we aimed to fabricate a new optical pH sensor based on a polyelectrolyte (PEC) membrane of pectin–chitosan and the active material chromoionophore ETH 5294. A trial-and-error investigation of the polymer compositions revealed that the optimum ratio of pectin to chitosan was 3:7. With an optimum wavelength region (λ) at 610 nm, the constructed sensor was capable of stable responses after 5 min exposure to phosphate-buffered solution. Furthermore, the obtained sensor achieved optimum sensitivity when the PBS concentration was 0.1 M, while the relative standard deviation values ranged from 2.07 to 2.34%, suggesting good reproducibility. Further investigation revealed that the sensor experienced decreased absorbance of 16.67–18.68% after 25 days of storage. Employing the optimum conditions stated previously, the sensor was tested to monitor fish freshness in samples that were stored at 4 °C and ambient temperature. The results suggested that the newly fabricated optical sensor could measure pH changes on fish skin after 25 h storage at room temperature (pH 6.37, 8.91 and 11.02, respectively) and 4 °C (pH 6.8, 7.31 and 7.92, respectively). Full article
(This article belongs to the Special Issue Optical Sensing Materials and Coatings)
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20 pages, 582 KiB  
Article
Analysis of Splice Loss of Single-Mode Optical Fiber in the High Altitude Environment
by Liwen Hu and Chaowei Yuan
Coatings 2021, 11(8), 876; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings11080876 - 22 Jul 2021
Cited by 5 | Viewed by 2909
Abstract
Up to now, there have been no complete theoretical researches and field experiment reports on the fiber fusion loss at high altitude. Therefore, we have conducted an exploratory study on the fiber splicing loss at high altitude, and firstly analyze the influence of [...] Read more.
Up to now, there have been no complete theoretical researches and field experiment reports on the fiber fusion loss at high altitude. Therefore, we have conducted an exploratory study on the fiber splicing loss at high altitude, and firstly analyze the influence of mode field diameter mismatch, axial offset, angle tilt or end face gap affected by high altitude on splice loss, and then discuss the influence of fusion-splicing parameters on splice loss. Besides, a mathematical model for reducing the splicing loss of single-mode fiber at high altitude is established by combining the effects of temperature, humidity, oxygen content, atmospheric pressure, gale and gravity. We have conducted repeated field fusion experiments in different altitude areas (53, 2980, 4000, 4200, 4300, 5020, and 5200 m) more than once, hence obtaining a large number of field experimental data, making a deep comparison between typical “plain” area and typical “high altitude” area. The splice loss of most fusion points achieved successfully has been reduced by at least 0.07 dB. The simulation results are basically consistent with the theoretical analysis. Ultimately, the method proposed has been directly applied to on-site splicing engineering in high altitude environment and achieves good results. Full article
(This article belongs to the Special Issue Optical Sensing Materials and Coatings)
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