| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Self-Powered Iontronic Devices Using Flexible Inorganic Piezoelectric Energy Harvesters |
| 초록 | Electrochemical devices based on conjugated polymers have received significant attention in bioelectronic applications. In particular, conjugated polymers have been known to be suitable for integration with biological systems since they can be soft, flexible, biocompatible, and both electronically and ionically conductive. In order for successful demonstration of integrated bioelectronic systems, in vivo implementation of batteries is essential to supply electric power for each iontronic component. Recently, flexible energy harvesters have emerged as a promising alternative to batteries as they generate sufficient electrical energy to operate such devices. Here, we demonstrate a high-performance flexible piezoelectric energy harvester consisting of a large-area PZT thin film on a plastic substrate to operate self-powered iontronic devices. A 2 μm thick crystalline PZT film on a rigid sapphire substrate (annealed at 650 °C in air for 45 minutes) is successfully transferred onto a flexible PET substrate via laser lift-off without structural damages or material degradation. The flexible PZT energy harvesting devices typically generate an open circuit voltage of ~200 V and a short circuit current of ~8 μA transduced from small mechanical deformation. The electrical output produced from slight bending and unbending motions charge capacitors and turn on more than 200 blue LEDs. Finally, a self-powered hybrid ionic circuit is implemented with PZT energy harvesters, rectifiers, energy storage elements, and iontronic devices. During the rectification followed by the energy storage, AC output of the harvester is converted into the DC to charge a 100 μF capacitor up to 5.3 V within ~25 minutes. The stored energy provides electrical current of ~150 nA to the OEIP lasted for ~20 minutes. The self-powered OEIP made of a biocompatible material known as PEDOT:PSS is utilized to precisely deliver acetylcholine, a neurotransmitter that regulates neuronal cell signaling and controls amyloid reactions, with a rate of ~10 pmol/μC. |
| 저자 | Daniel Juhyung Joe, Jae Hyun Han, Keon Jae Lee |
| 소속 | KAIST |
| 키워드 | <P>energy harvesters; piezoelectricity; flexible electronics; iontronic devices</P> |
