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Flexible Inorganic Materials for New Sensors
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Flexible Inorganic Materials for New Sensors

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

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 12299

Special Issue Editors

Dr. Tomohiko Nakajima

E-Mail Website
Guest Editor
Advanced Coating Technology Research Center, National Institute of Advanced Industrial Science and Technology, Ibaraki 305-8565, Japan
Interests: Low temperature processing of ceramic films; Photo-crystallization; Laser fabrication of inorganic materials; Wearable sensors
Prof. Dr. Tohru Sugahara

E-Mail Website
Guest Editor
The Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
Interests: Gas sensor; Photovoltaic; Thin film transistor
Dr. Yuki Fujio

E-Mail Website
Guest Editor
Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Saga 841-0052, Japan
Interests: Mechanoluminescence material; Liquid-phase synthesis; Optical imaging; Inorganic/Organic composite film; Visualization of strain/stress distribution

Special Issue Information

Dear Colleagues,

Flexible devices have attracted much attention because of their new roles in healthcare monitoring for extending healthy life expectancy and 3D-electronics for next-generation advanced devices. In healthcare monitoring, it is necessary to fabricate various sensors directly onto highly flexible plastic substrates for the accurate diagnosis of pre-symptomatic states through real-time monitoring. In 3D-electronics, sensing devices are very important to realize new functionalities, and they should be incorporated into complex-shaped plastic objects. In either device, inorganic materials such as ceramics and metal alloys for sensors, resistors, capacitors, illuminators, and electric source-related components are highly essential because of their sufficient chemical and physical durability. However, it was not easy to combine high functionality and flexibility due to the high fabrication temperatures of inorganic materials and the low heat resistance of flexible plastic substrates. Nevertheless, recent studies of low-temperature processes and the enhancement of precursor reactivity have achieved the fabrication of inorganic materials on plastic substrates by using new approaches. In this Special Issue, we call for papers presenting advances in flexible inorganic materials for new sensor devices. Topics in general include, but are not limited to, the following:

- Flexible sensor devices using ceramics and metal alloy components

- Low temperature direct-processing of ceramics and metal alloys on plastics

- Packaging technology of ceramics and metal alloys on plastics

- Ceramic and metal alloy films on complex-shaped substrates for 3D-electronics.

Dr. Tomohiko Nakajima
Prof. Dr. Tohru Sugahara
Dr. Yuki Fujio
Guest Editors

Manuscript Submission Information

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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

  • flexible sensors
  • wearable sensors
  • bio-sensing devices
  • flexible ceramics and metal alloys
  • low temperature processing
  • 3D-electronics
  • packaging technology

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Published Papers (3 papers)

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Research

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10 pages, 4340 KiB  
Communication
Flexible Mechanoluminescent SrAl2O4:Eu Film with Tracking Performance of CFRP Fracture Phenomena
by Yuki Fujio, Chao-Nan Xu and Nao Terasaki
Sensors 2022, 22(15), 5476; https://doi.org/10.3390/s22155476 - 22 Jul 2022
Cited by 10 | Viewed by 2543
Abstract
Non-destructive testing of carbon-fiber-reinforced plastic (CFRP) laminates with bidirectional fiber bundles (twill-weave) using a mechanoluminescence (ML) technique was proposed. The dynamic strain distributions and fracture phenomena of the CFRP laminates in the tensile testing were evaluated by the fabricated ML sensor consisting of [...] Read more.
Non-destructive testing of carbon-fiber-reinforced plastic (CFRP) laminates with bidirectional fiber bundles (twill-weave) using a mechanoluminescence (ML) technique was proposed. The dynamic strain distributions and fracture phenomena of the CFRP laminates in the tensile testing were evaluated by the fabricated ML sensor consisting of SrAl2O4:Eu (SAOE) powder and epoxy resin. The ML images for the ML sensor attached to the CFRP laminates with bidirectional fiber bundles gave a net-like ML intensity distribution similar to the original twill weave pattern. Specifically, it was found that the ML intensity on the longitudinal fiber bundle, which is the same as the tensile direction, is higher than that on the transverse fiber bundle. This indicates that the ML sensor can visualize the load share between fiber bundles in different directions of the CFRP laminate with high spatial resolution. Meanwhile, the ML sensor could also visualize the ultrafast discontinuous fracture process of the CFRP laminates and its stress distribution. The amount of SAOE powder in the ML sensor affects the tracking performance of the crack propagation. A higher SAOE amount leads to a fracture of the ML sensor itself, and a lower SAOE amount leads to poor ML characteristics. Full article
(This article belongs to the Special Issue Flexible Inorganic Materials for New Sensors)
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8 pages, 1891 KiB  
Communication
Giant Wrinkles on the Surface of Epitaxial BaTiO3 Thin Films with Drastic Shrinkage during Transfer from a MgO(100) Single-Crystal Substrate to a Flexible Polyethylene Terephthalate Sheet
by Hiroaki Nishikawa, Shinji Umatani, Tomofumi Mizuyama, Akihiro Hiraoka and Katsuhiro Mikami
Sensors 2021, 21(21), 7326; https://doi.org/10.3390/s21217326 - 3 Nov 2021
Cited by 9 | Viewed by 3493
Abstract
The transfer of ferroelectric and piezoelectric BaTiO3 epitaxial thin films from an original MgO(100) single-crystal substrate to a polyethylene terephthalate (PET) sheet has been studied to fabricate flexible epitaxial functional oxides. The outline of our previous transfer process is as follows: [...] Read more.
The transfer of ferroelectric and piezoelectric BaTiO3 epitaxial thin films from an original MgO(100) single-crystal substrate to a polyethylene terephthalate (PET) sheet has been studied to fabricate flexible epitaxial functional oxides. The outline of our previous transfer process is as follows: the epitaxial BaTiO3 thin films were deposited on the MgO(100). Then, the surface of the BaTiO3 was adhered onto a PET sheet. Finally, only the MgO(100) substrate was dissolved in a phosphoric aqueous solution, which resulted in the transfer of the epitaxial BaTiO3 thin film from the MgO(100) to a PET sheet. To establish this transfer process, our aim was to prevent any damage, such as cracks and exfoliation, during the transfer of the epitaxial functional oxides. We found that a Pt buffer layer with a ductile nature was effective for improving the quality of transferred epitaxial BaTiO3 thin films. Moreover, the epitaxial BaTiO3 thin films showed a drastic shrinkage of ca. 10%. The surfaces of the shrunk, epitaxial BaTiO3 thin films showed giant wrinkles with a micrometer-order amplitude and a 10-μm-order periodicity without any damage. The epitaxial BaTiO3 thin films with giant wrinkles, accompanied by drastic shrinkage, are similar to the thin films that are coated on a pre-stretched elastomer, which is one of the fabrication processes of stretchable devices. Full article
(This article belongs to the Special Issue Flexible Inorganic Materials for New Sensors)
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Review

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28 pages, 14353 KiB  
Review
Flexible Ceramic Film Sensors for Free-Form Devices
by Tomohiko Nakajima, Yuki Fujio, Tohru Sugahara and Tetsuo Tsuchiya
Sensors 2022, 22(5), 1996; https://doi.org/10.3390/s22051996 - 3 Mar 2022
Cited by 19 | Viewed by 5199
Abstract
Recent technological innovations, such as material printing techniques and surface functionalization, have significantly accelerated the development of new free-form sensors for next-generation flexible, wearable, and three-dimensional electronic devices. Ceramic film sensors, in particular, are in high demand for the production of reliable flexible [...] Read more.
Recent technological innovations, such as material printing techniques and surface functionalization, have significantly accelerated the development of new free-form sensors for next-generation flexible, wearable, and three-dimensional electronic devices. Ceramic film sensors, in particular, are in high demand for the production of reliable flexible devices. Various ceramic films can now be formed on plastic substrates through the development of low temperature fabrication processes for ceramic films, such as photocrystallization and transferring methods. Among flexible sensors, strain sensors for precise motion detection and photodetectors for biomonitoring have seen the most research development, but other fundamental sensors for temperature and humidity have also begun to grow. Recently, flexible gas and electrochemical sensors have attracted a lot of attention from a new real-time monitoring application that uses human breath and perspiration to accurately diagnose presymptomatic states. The development of a low-temperature fabrication process of ceramic film sensors and related components will complete the chemically stable and reliable free-form sensing devices by satisfying the demands that can only be addressed by flexible metal and organic components. Full article
(This article belongs to the Special Issue Flexible Inorganic Materials for New Sensors)
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