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Fabrication and Testing of Photonic Thermometers

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Published on: October 24, 2018

Ultrathin Fiber-Mesh Polymer Thermistors.

Chihiro Okutani^1,2, Tomoyuki Yokota¹, Takao Someya¹

¹Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|September 4, 2022

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New ultrathin, flexible polymer positive temperature coefficient (PTC) thermistors offer safe, reliable overheat protection for wearable and implantable health monitoring devices.

Area of Science:

Materials Science
Electrical Engineering
Biomedical Engineering

Background:

Flexible sensors are crucial for on-skin and in-body health monitoring.
Effective thermal management is essential for the safe operation of these flexible electronic devices.

Purpose of the Study:

To develop ultrathin, flexible positive temperature coefficient (PTC) thermistors for thermal protection circuits.
To create lightweight, transparent, and mechanically robust thermal protection for flexible electronics.

Main Methods:

Electrospinning of acrylate polymer and carbon nanofibers to create fiber-type thermistors.
Coating the fibrous composite with parylene to form a core-sheath structure for enhanced repeatability.
Fabrication of a mesh structure for the thermistor layer to achieve ultra-lightweight and transparent properties.

Keywords:

composite materials fiber-mesh structures polymer thermistors ultrathin electronics

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Main Results:

Developed 5 µm thick fiber-type thermistors with a resistance increase of three orders of magnitude within ≈2 °C.
Achieved repeatable temperature characteristics for up to 400 cycles.
Demonstrated high transparency (>90% in 400-800 nm) and mechanical flexibility, withstanding wrapping around a 280 µm radius needle without degradation.

Conclusions:

Ultrathin mesh polymer PTC thermistors provide effective overheat prevention for flexible electronic devices.
The developed thermistors are suitable for integration into on-skin and implantable health monitoring systems.
The gas-permeable nature of the fibrous thermistor opens possibilities for advanced biomedical applications.