Flexible Ceramic Film Sensors for Free-Form Devices

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 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.

Ultrafine-fiber thermistors for microscale biomonitoring

“…[25][26][27] This technique has a great advantage of enabling the low-temperature fabrication of ceramic films on free-form resin substrates, which have been named ''free-form film ceramics.'' 28 In the present study, we have fabricated a polycrystalline Mnbased spinel 29,30 Mn 1.4 Co 0.9 Ni 0.5 Cu 0.2 O 4 (MCNC) film as a thermistor sensor directly on an ultrafine resin fiber (f15 mm in diameter) by using the PC technique, and we have demonstrated the feasibility of accurately monitoring the temperatures of microscopic objects by reducing the thermal influence of the thermistor substrate sufficiently.…”

“…Nevertheless, photocrystallization (PC) techniques based on a simple solution-deposition process have recently been developed 17–24 and have been used to fabricate stable, flexible sensor films. 25–27 This technique has a great advantage of enabling the low-temperature fabrication of ceramic films on free-form resin substrates, which have been named “free-form film ceramics.” 28…”

Magnetic Bacterial Cellulose Biopolymers: Production and Potential Applications in the Electronics Sector

“…Sriplai et al [ 97 ] and Marins et al [ 85 ] also proposed the application of magnetic BC in the production of sensors. Nakajima et al [ 113 ] stated that magnetic characteristics and flexibility are important for the applicability of modern sensors, since flexibility gives devices freer, more adaptable forms. Sriplai et al [ 19 ] pointed out the piezoelectric properties (ability to generate electrical voltage in response to a mechanical stimulus) in magnetic BC films, which were conferred by manganese ferrites for the development of a greater variety of sensors.…”

Advances in Humidity Nanosensors and Their Application: Review

“…Some materials and measurement types of humidity nanosensor technologies have been researched in the literature; materials including ceramic [ 6 , 7 , 8 , 9 , 10 ], polymer [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ], semiconductor [ 18 , 19 , 20 , 21 , 22 ], carbon-based [ 23 , 24 , 25 , 26 , 27 , 28 ], and MXene material [ 29 , 30 ] are shown in Figure 2 . Generally, the semiconductor and carbon-based humidity sensor can achieve higher sensor response, accompanied by a complex fabrication procedure and longer process time.…”