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Recent Advances in Low Cost Capacitive Sensors

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

Deadline for manuscript submissions: closed (30 November 2024) | Viewed by 5907

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Guest Editor
Electrical Micro & Nano Devices and Sensors Research Centre (e-Minds), Department of Electrical & Computer Engineering, University of Windsor, 401 Sunset Ave., Windsor, ON N9B 3P4, Canada
Interests: microelectromechanical systems (MEMS); bio-medical devices; MEMS sensors and transducers; chemical sensors; micro and nano fabrication technologies
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Special Issue Information

Dear Colleagues,

Recent advances in micromachining, semiconductor technology, and advanced manufacturing have led to the development of start-of-the-art cost-effective sensors and transducers for various detection applications, including biomedical, environmental, and industrial applications.

In the continuous effort to enhance the performance of sensors and minimize the cost of development and integration, this Special Issue will focus on current state-of-the-art low-cost capacitive sensors and their design, development, characterization, and application in various fields.

We would like to invite researchers to contribute original papers as well as review articles that present the following: breakthroughs and innovative advancements in the design, development and fabrication of such sensors; the methods of integration employed to reduce the cost; methods of micromachining, batch fabrication, and advanced cost-effective technologies; methods to enhance sensor sensitivity, selectivity, biocompatibility, and packaging; recent multi-disciplinary applications; the novel and unique aspects to detect; and sensor modeling and simulations.

Dr. Arezoo Emadi
Guest Editor

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Keywords

  • capacitive sensors
  • impedance and capacitance
  • integrated platform
  • low cost
  • micromachining
  • selectivity
  • sensitivity
  • sensor arrays
  • smart sensors
  • wearable sensors

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Published Papers (2 papers)

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Research

31 pages, 3793 KiB  
Article
A Circular Touch Mode Capacitive Rainfall Sensor: Analytical Solution and Numerical Design and Calibration
by Xiao-Ting He, Jun-Song Ran, Ji Wu, Fei-Yan Li and Jun-Yi Sun
Sensors 2024, 24(19), 6291; https://doi.org/10.3390/s24196291 - 28 Sep 2024
Viewed by 955
Abstract
A circular capacitive rainfall sensor can operate from non-touch mode to touch mode; that is, under the action of enough rainwater, its movable electrode plate can form a circular contact area with its fixed electrode plate. Therefore, the weight of rainwater is borne [...] Read more.
A circular capacitive rainfall sensor can operate from non-touch mode to touch mode; that is, under the action of enough rainwater, its movable electrode plate can form a circular contact area with its fixed electrode plate. Therefore, the weight of rainwater is borne by only its movable electrode plate in non-touch mode operation but by both its movable and fixed electrode plates in touch mode operation, and the total capacitance of its touch mode operation is much larger than that of its non-touch mode operation. Essential to its numerical design and calibration is the ability to predict the deflection shape of its moveable electrode plate to determine its total capacitance. This requires the analytical solution to the fluid–structure interaction problem of its movable electrode plate under rainwater. In our previous work, only the analytical solution for the fluid–structure interaction problem before its movable electrode plate touches its fixed electrode plate was obtained, and how to numerically design and calibrate a circular non-touch mode capacitive rainfall sensor was illustrated. In this paper, the analytical solution for the fluid–structure interaction problem after its movable electrode plate touches its fixed electrode plate is obtained, and how to numerically design and calibrate a circular touch mode capacitive rainfall sensor is illustrated for the first time. The numerical results show that the total capacitance and rainwater volume when the circular capacitive rainfall sensor operates in touch mode is indeed much larger than that when the same circular capacitive rainfall sensor operates in non-touch mode, and that the average increase in the maximum membrane stress per unit rainwater volume when the circular capacitive rainfall sensor operates in touch mode can be about 20 times smaller than that when the same circular capacitive rainfall sensor operates in non-touch mode. This is where the circular touch mode capacitive rainfall sensor excels. Full article
(This article belongs to the Special Issue Recent Advances in Low Cost Capacitive Sensors)
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17 pages, 3338 KiB  
Article
Monoolein-Based Wireless Capacitive Sensor for Probing Skin Hydration
by Vivek Chaturvedi, Magnus Falk, Sebastian Björklund, Juan F. Gonzalez-Martinez and Sergey Shleev
Sensors 2024, 24(14), 4449; https://doi.org/10.3390/s24144449 - 10 Jul 2024
Cited by 2 | Viewed by 1692
Abstract
Capacitive humidity sensors typically consist of interdigitated electrodes coated with a dielectric layer sensitive to varying relative humidity levels. Previous studies have investigated different polymeric materials that exhibit changes in conductivity in response to water vapor to design capacitive humidity sensors. However, lipid [...] Read more.
Capacitive humidity sensors typically consist of interdigitated electrodes coated with a dielectric layer sensitive to varying relative humidity levels. Previous studies have investigated different polymeric materials that exhibit changes in conductivity in response to water vapor to design capacitive humidity sensors. However, lipid films like monoolein have not yet been integrated with humidity sensors, nor has the potential use of capacitive sensors for skin hydration measurements been fully explored. This study explores the application of monoolein-coated wireless capacitive sensors for assessing relative humidity and skin hydration, utilizing the sensitive dielectric properties of the monoolein–water system. This sensitivity hinges on the water absorption and release from the surrounding environment. Tested across various humidity levels and temperatures, these novel double functional sensors feature interdigitated electrodes covered with monoolein and show promising potential for wireless detection of skin hydration. The water uptake and rheological behavior of monoolein in response to humidity were evaluated using a quartz crystal microbalance with dissipation monitoring. The findings from these experiments suggest that the capacitance of the system is primarily influenced by the amount of water in the monoolein system, with the lyotropic or physical state of monoolein playing a secondary role. A proof-of-principle demonstration compared the sensor’s performance under varying conditions to that of other commercially available skin hydration meters, affirming its effectiveness, reliability, and commercial viability. Full article
(This article belongs to the Special Issue Recent Advances in Low Cost Capacitive Sensors)
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