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Pyeong An Kim(김평안),Yeon Uk Kim(김연욱),Ui Yeon Nam(남의연),Jae Hun Yang(양재훈),Yu Mi Woo(우유미),Jae Jun Lee(이재준),Hyeryeon Seo(서혜련),Jung Hwan Park(박정환) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
One-dimensional metallic nanowires (NWs) have been studied for flexible transparent conductors to replace indium tin oxide due to their brittleness and high costs. Flash-induced heating methods have received attention as a new technique for next-generation flexible electrodes, because of their advantages such as fast processing, large area processability, and compatibility with roll-to-roll manufacturing. Herein we report flexible AgNWs conductors with outstanding optoelectronic properties and robust adhesion on flexible substrates. Localized photothermic energy could occur at the junctions of AgNWs by flash light, resulting in an entirely welded AgNW network. At the same time, the interface of AgNWs and underlying PET film could be melted by the near-infrared (NIR) spectrum of flashlight, which increased the adhesion of the AgNWs by 310 %. To confirm the practical uses of our technique, we successfully fabricated a high-quality transparent energy harvester by using flash-welded AgNW network.
Yeon Uk Kim(김연욱),Jae Jun Lee(이재준),Pyeong An Kim(김평안),Jae Hun Yang(양재훈),Ui Yeon Nam(남의연),Yu Mi Woo(우유미),Jung Hwan Park(박정환) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The optogenetic brain stimulation system has attracted significant attention, as it can provide powerful solutions for continuous and real-time monitoring of various neurological diseases such as stroke, epilepsy, and dementia. A number of research groups have developed diverse optogenetic modulating systems, however, the limited lifespan of traditional batteries requires periodic (every 7 years) replacement surgery for optogenetic treatment. Herein, we demonstrated a selfpowered optogenetic brain stimulation system by scavenging wasted magnetic energy and operating flexible micro lightemitting diodes (f-μLEDs). Through the flash-induced stamping technology, a micro/nanostructured surface was formed on the triboelectric Nylon film, which was applied for outstanding performance magneto-mechano-triboelectric nanogenerator (MMTENG). The flash-treated MMTENG generated an open-circuit voltage of 870 V and a short-circuit current of 145 μA under a 7 Oe magnetic field, which was successfully operating an f-μLED array. The developed optogenetic brain stimulation system was smoothly inserted under the skull of the mouse without fatal damage of brain tissues.
Standardization Self-Certification of Small-Quantity Production Automobile
Jin-suk Park(박진석),Pyeong-an Kim(김평안),Heung-sik Lee(이흥식),Sung-yong Ha(하성용) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Crash testing for a small-quantity production automobile requires only crash data onto the body frame using self-certification, and is possible with simulated data, not actual tests. However, the practicality of it is very poor due to insufficient guidelines for crash testing and evaluation methods. To compensate for this, the standardization of simulation method and evaluation method for simulated computerized car crash test for small-quantity production automobile was produced based on the crash test data through the simulation analysis.
Flashlight-Induced High-Performance Stretchable Cu conductoers
Yu Mi Woo(우유미),Ui Yeon Nam(남의연),Yeon Uk kim(김연욱),Jae Hun Yang(양재훈),Pyeong An Kim(김평안),Jae Jun Lee(이재준),Seoung Jun Lee(이승준) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Herein, we report a novel stretchable Cu conductors with significant conductivity and elasticity, which was allowed by the flash-induced multiscale interface interactions between Cu and a polymer. Microscale randomly wrinkled Cu was demonstrated on an elastomer by irradiating single pulse of millisecond flashlight, enabling stretchability of Cu conductor to exceeding 20% in all directions. Simultaneously, the enhanced adhesion force of the nanoscale interlocked interface between the Cu nanoparticles and the elastomeric substrate increased the reliability and elasticity of Cu. Finally, the fabricated crumpled Cu conductor exhibited outstanding electrode conductivity of 37 kS cm<SUP>-1</SUP> despite severe stress caused by the motion of human wrist, which was successfully utilized for wireless near-filed communication system.
Ui Yeon Nam(남의연),Yu Mi Woo(우유미),Yeon Uk Kim(김연욱),Jae Hun Yang(양재훈),Pyeong An Kim(김평안),Jae Jun Lee(이재준),Jung Hwan Park(박정환) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Herein, a outstanding performance Cu nanowires with sheet resistance of 17Ω sq<SUP>-1</SUP> and transmittance of 88% was fabricated by flash-induced plasmonic nanowelding process. The high-intensity flashlight (in the region of visible wavelength) significantly enhanced plasmonic welding of Cu NW intersections without any oxidation. Simultaneously, near-infrared (NIR) spectrum of flash light interlocked the interface between polyethylene terephthalate substrate and Cu NWs. To investigate the adhesion enhacement of interlocked Cu NWs, we conducted a quantitative peel test. the measured NW interfacial fracture force increased by 208% compared to that of a pristine Cu NW electrode. To demonstrate versatile uses of flash-induced Cu NW conductors, transparent resistive memory devices and touch screen panel were successfully fabricated on plastics by employing the flash-welded excellent performance Cu NW network.