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Humidity Sensors Based on Spectroscopy

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

Deadline for manuscript submissions: 25 July 2025 | Viewed by 1049

Special Issue Editors


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Guest Editor
1. Department of Physics, School of Science and Technology, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
2. INESC TEC—Institute for Systems and Computer Engineering, Technology and Science and Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
Interests: optical fiber sensors; gas sensing; biosensor; surface plasmon resonance; spectral; humidity sensors
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
INESC TEC—Institute for Systems and Computer Engineering, Technology and Science and Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
Interests: optical sensing; optical fiber flowmeter; optical fiber sensors; gas sensing; spectral; biosensor
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Humidity sensors play a crucial role in R&D across various fields, contributing to the advancement of technology and scientific understanding. Spectroscopy is of paramount importance in sensing for the detection of chemical components or the quantification of their concentrations.

This Special Issue aims to provide a platform for the dissemination of cutting-edge research and advancements in the field of humidity sensors utilizing spectroscopic techniques. Humidity sensing plays a crucial role in a wide range of applications, including environmental monitoring, industrial processes, agriculture, and healthcare. This Special Issue focuses on the development and application of spectroscopic methods for accurate and sensitive humidity sensing.

We invite contributions addressing various aspects of humidity sensors based on spectroscopy, including but not limited to:

  • The development and characterization of novel materials and sensing elements for humidity detection using spectroscopic techniques.
  • The design and fabrication of optical setups and systems for spectroscopic humidity sensing.
  • The integration of spectroscopic humidity sensors into practical devices and applications.
  • Advances in data analysis, signal processing, and calibration methods for spectroscopic humidity sensors.

Researchers, scientists, and engineers from both academia and industry are encouraged to submit original research articles, reviews, and technical notes that contribute to the advancement of humidity sensors based on spectroscopy. By fostering interdisciplinary collaboration and knowledge exchange, this Special Issue aims to accelerate the development and deployment of spectroscopic-based humidity sensing technologies with improved accuracy, sensitivity, and reliability.

Dr. José Manuel M. M. De Almeida
Dr. Luís C. 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

  • environmental monitoring
  • nanosensors and nanotechnology
  • optical and photonic humidity sensors
  • optical fiber sensing
  • remote sensing

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Published Papers (1 paper)

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Research

27 pages, 3101 KiB  
Article
Development of a Sustainable Flexible Humidity Sensor Based on Tenebrio molitor Larvae Biomass-Derived Chitosan
by Ezekiel Edward Nettey-Oppong, Riaz Muhammad, Emmanuel Ackah, Hojun Yang, Ahmed Ali, Hyun-Woo Jeong, Seong-Wan Kim, Young-Seek Seok and Seung Ho Choi
Sensors 2025, 25(2), 575; https://doi.org/10.3390/s25020575 - 20 Jan 2025
Viewed by 619
Abstract
This study presents the fabrication of a sustainable flexible humidity sensor utilizing chitosan derived from mealworm biomass as the primary sensing material. The chitosan-based humidity sensor was fabricated by casting chitosan and polyvinyl alcohol (PVA) films with interdigitated copper electrodes, forming a laminate [...] Read more.
This study presents the fabrication of a sustainable flexible humidity sensor utilizing chitosan derived from mealworm biomass as the primary sensing material. The chitosan-based humidity sensor was fabricated by casting chitosan and polyvinyl alcohol (PVA) films with interdigitated copper electrodes, forming a laminate composite suitable for real-time, resistive-type humidity detection. Comprehensive characterization of the chitosan film was performed using Fourier-transform infrared (FTIR) spectroscopy, contact angle measurements, and tensile testing, which confirmed its chemical structure, wettability, and mechanical stability. The developed sensor exhibited a broad range of measurements from 6% to 97% relative humidity (RH), a high sensitivity of 2.43 kΩ/%RH, and a rapid response time of 18.22 s with a corresponding recovery time of 22.39 s. Moreover, the chitosan-based humidity sensor also demonstrated high selectivity for water vapor when tested against various volatile organic compounds (VOCs). The superior performance of the sensor is attributed to the structural properties of chitosan, particularly its ability to form reversible hydrogen bonds with water molecules. This mechanism was further elucidated through molecular dynamics simulations, revealing that the conductivity in the sensor is modulated by proton mobility, which operates via the Grotthuss mechanism under high-humidity and the packed-acid mechanism under low-humidity conditions. Additionally, the chitosan-based humidity sensor was further seamlessly integrated into an Internet of Things (IoT) framework, enabling wireless humidity monitoring and real-time data visualization on a mobile device. Comparative analysis with existing polymer-based resistive-type sensors further highlighted the superior sensing range, rapid dynamic response, and environmental sustainability of the developed sensor. This eco-friendly, biomass-derived, eco-friendly sensor shows potential for applications in environmental monitoring, smart agriculture, and industrial process control. Full article
(This article belongs to the Special Issue Humidity Sensors Based on Spectroscopy)
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