Organic transistors with high thermal stability for medical applications

Kuribara, Kazunori; Wang, He; Uchiyama, Naoya; Fukuda, Kenjiro; Yokota, Tomoyuki; Zschieschang, Ute; Jaye, Cherno; Fischer, Daniel A.; Klauk, Hagen; Yamamoto, Tatsuya; Takimiya, Kazuo; Ikeda, Masaaki; Kuwabara, Hirokazu; Sekitani, Tsuyoshi; Loo, Yueh Lin; Someya, Takao

doi:10.1038/ncomms1721

Cited by 305 publications

(232 citation statements)

References 32 publications

Supporting

Mentioning

219

Contrasting

Order By: Relevance

“…2 for the threshold voltage histogram). The saturation mobility of these devices is comparable to the value of 2.1 cm 2 V −1 s −1 measured in long-channel (40-50 μm) conventional DNTT TFTs deposited on an n-tetradecylphosphonic acid self-assembled monolayer (SAM) with gold top-contact electrodes 44,45 Fig. 3).…”

Section: Resultssupporting

confidence: 70%

Charge-integrating organic heterojunction phototransistors for wide-dynamic-range image sensors

2017

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 70%

Charge-integrating organic heterojunction phototransistors for wide-dynamic-range image sensors

2017

View full text Add to dashboard Cite

“…When the temperature increases from 30.0°C to 34.5°C, the on-current decreases from 1 mA to 10 nA, showing a large change (over 10 5 ) of current for the integrated devices. It should be noted that organic transistors with DNTT channel layers show negligibly small changes when heated to 40°C (27).…”

Section: Resultsmentioning

confidence: 99%

Ultraflexible, large-area, physiological temperature sensors for multipoint measurements

Yokota

Inoue

Terakawa

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

329

298

View full text Add to dashboard Cite

We report a fabrication method for flexible and printable thermal sensors based on composites of semicrystalline acrylate polymers and graphite with a high sensitivity of 20 mK and a high-speed response time of less than 100 ms. These devices exhibit large resistance changes near body temperature under physiological conditions with high repeatability (1,800 times). Device performance is largely unaffected by bending to radii below 700 μm, which allows for conformal application to the surface of living tissue. The sensing temperature can be tuned between 25°C and 50°C, which covers all relevant physiological temperatures. Furthermore, we demonstrate flexible active-matrix thermal sensors which can resolve spatial temperature gradients over a large area. With this flexible ultrasensitive temperature sensor we succeeded in the in vivo measurement of cyclic temperatures changes of 0.1°C in a rat lung during breathing, without interference from constant tissue motion. This result conclusively shows that the lung of a warm-blooded animal maintains surprising temperature stability despite the large difference between core temperature and inhaled air temperature. T emperature control plays a very important role in homeostasis, and body temperature varies both spatially and temporally in an effort to transfer heat between the living body and the environment via skin and respiratory organs. Accurate measurement of localized temperature changes in soft tissue regardless of large-scale motion is important in understanding thermal phenomena of homeostasis and realizing future sophisticated health diagnostics (1-3). Therefore, flexible temperature sensors which softly interface with tissue have been investigated frequently for applications in the medical field. However, these applications require the combination of sensitivity, fast response time, stability in physiological environments, and multipoint measurement. Before this work, to our knowledge, no experiment has simultaneously demonstrated orders-of-magnitude changes in electrical properties (sensitivity) repeatedly at varying physiological temperatures and conditions (stability) in a robust, easy-to-fabricate, flexible temperature sensor (processability).When sensors and electronics are directly attached to the surface of an animal body, the use of soft and flexible electronic devices is expected to reduce mechanical stress induced on the body. From this viewpoint, the field of flexible electronics has attracted much attention recently. The ability to gather information such as pressure and temperature from curvilinear and dynamic surfaces without impairing the movement or usability of the users is unmatched by conventional silicon electronics. There have been reports of the potential application of flexible electrodes on ultrathin substrates (4), flexible sensors that measure biological signals, electrocardiograms, temperature, pressure (5, 6), organic amplifier systems (7), high-sensitivity pressure sensors (8), and ultrathin and imperceptible devices (9, 10).To meas...

show abstract

“…The geometry of the array can be tailored to tune the effective CTE [ 9,11 ] on demand. These engineered thin fi lms with tunable CTE can provide solutions to thermal fatigue and failure of light-weight devices operating in extreme thermal environments, such as space optical systems, [ 1,2 ] MEMS/semiconductor devices including fl exible electronics, [ 5,6 ] biomedical sensors, [ 12,13 ] and solar energy applications. [ 3,4 ] Conventional materials expand when heated, because the interatomic length increases with the potential energy.…”

Section: Doi: 101002/adma201304997mentioning

confidence: 99%