CE Seminar byProf. Tae-il Kim / Bio-Integrated & Bio-Inspired Electronics and their Thermal Management

Time: 10:00
Location: ENG 208






Speaker: Prof. Tae-il Kim

Title: Bio-Integrated & Bio-Inspired Electronics and their Thermal Management

Date: 15 March 2019
Time: 10:00 - 11:00
Place: ENG 208

Host: Sedat Nizamošlu



We demonstrate two kinds of unconventional electronics, implantable/bio-inpsired electronics with flexible substrate. The implantable device shows transferrable, bright, and thin micro GaN LEDs and their arrays on flexible substrate utilized in optogenetics [1] and bio-inspired devices show one example for a ultramecha-sensitive nanoscale crack sensors.[2] In the usual optogenetic technique, the enabled modes of use are impossible to realize using standard approaches that rely on rigid, long, glass fiber optics coupled to external, bulky light sources. Our systems exploit ultrathin, flexible substrates populated with microscale inorganic light emitting diodes (LEDs) together with electrophysiological and temperature sensors, all mounted on removable plastic needles that facilitate insertion into the tissue.  Detailed experimental and theoretical studies of the operation, ranging from heat flow aspects to inflammation assessments and comparison to conventional devices, illustrate the unique features of this technology. Also we exploit wearable ultrasensitive mechanosensor based on nanoscale cracks inspired by spider slit organ. The sensors are sensitive to strain (with a gauge factor of over 2,000 in the 0–2 per cent strain range) and vibration (with the ability to detect amplitudes of approximately 10 nanometers).[3,4] The device is reversible, reproducible, durable and mechanically flexible, and can thus be easily mounted on human skin as an electronic multipixel array for detecting human physiology, voice pattern recognition. We believe that these unconventional devices could be useful in diverse applications requiring ultrahigh displacement sensitivity in other areas of implantable diagnostics and therapeutics.



[1] Tae-il Kim et al. Science 340, 211 (2013).

[2] D. Kang et al. Nature 516, 222 (2014).

[3] B. Park et al. Adv. Mater. 28, 8130 (2016).




Tae-il Kim is currently working as an associate professor in School of Chemical Engineering at Sungkyunkwan University (SKKU), Korea. He earned his BS and Ph.D degree from the SKKU and Seoul National University, respectively. He moved to University of Illinois at Urbana-Champaign (UIUC) for postdoctoral research with Prof. John A. Rogers, working on the bio-integrated optoelectronic devices and their optogenetic applications from 2009 to 2012. His research is based on flexible and bioinspired electronics fabricated by unconventional lithography.