News from Nanotechjapan

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A Printable, Flexible, Lightweight Temperature Sensor

 The University of Tokyo issued a press release on 10th November 2015, that a research group of the university has developed a flexible, lightweight sensor that responds rapidly to tiny thermal changes in the range of human body temperature. The results were published in Proceedings of the National Academy of Sciences (PNAS)* with Professor Takao Someya as the senior author.

 The research group has developed a new printable, flexible temperature sensor that shows a very large change in electrical resistance of up to 100,000 times over a range of only 5 ℃, allowing accurate temperature measurement without additional complicated display circuitry. The sensor is composed of graphite and a semicrystalline acrylate polymer formed of two monomers. The target temperature range at which the sensor is most precise can be selected simply by altering the proportions of the two monomers. The sensor has response times of less than 100 ms and a temperature sensitivity of 0.02 ℃. The device was also stable even under physiological conditions, providing repeated readings up to 1,800 times.

 This sensor is expected to find healthcare and welfare applications in devices for monitoring body temperature, for example, of newborn infants or of patients in intensive care settings.

*Tomoyuki Yokota, Yusuke Inoue, Yuki Terakawa, Jonathan Reeder, Martin, Kaltenbrunner, Taylor Ware, Kejia Yang, Kunihiko Mabuchi, Tomohiro, Murakawa, Masaki Sekino, Walter Voit, Tsuyoshi Sekitani, and Takao Someya, "Ultraflexible, large-area, physiological temperature sensors for multipoint measurements", PNAS Early edition, doi: 10.1073/pnas.1515650112; Published online before print November 9, 2015