Korea University · Engineering
Professor James Jungho Pak's research lab specializes in advanced functional materials and their applications in energy conversion, micro-electromechanical systems (MEMS), and electronic devices. The lab focuses on developing novel nanomaterials such as ionic polymer-metal composites (IPMCs), cellulose-based fibers, and transition metal oxide/fluoride heterostructures for use in micro-actuators, micro-pumps, supercapacitors, and electrocatalysts for hydrogen evolution. Key research directions include resistive switching memory (RRAM) devices with multilayer insulating structures, scalable synthesis of ultrathin 2D materials like BiOCl, and electrowetting-based droplet manipulation for lab-on-a-chip systems. The lab emphasizes materials design, device fabrication, and comprehensive electrochemical and physical characterization to enable high-performance, stable, and scalable technologies.
Figures are computed from collected data and may differ slightly.
This paper describes the fabrication and characteristics of an ionic polymer-metal composite (IPMC) membrane-shaped micro-actuator and its application to the fabrication of a micro-pump. After fabricating two 8mm×8mm IPMC membrane-shaped actuators using a Nafion film, their displacements were measured. The fabricated IPMC membrane-shaped micro-actuators showed displacement of 14~27μ at the applied voltage ranging from 4VP-P to 10VP-P at 0.5Hz. Displacement of the IPMC actuator fabricated wi
In dry jet-wet spinning of a cellulose/ N-methylmorpholine N-oxide hydrate solution, the effects of the hydration number n in NMMO hydrates and the concentration and molecular weight of cellulose are investigated in terms of the physical properties of the fibers. Dry jet-wet spinning of lyocell fibers is also investigated using three different set-ups; a piston type, an N 2 gas pressure type, and spinning equipment with an extruder. The effects of spinning conditions such as the spin draw ratio,
Abstract In this study, we have investigated the resistive switching behavior of multi-stacked PVA/GO + PVA composite/PVA insulating layer-based RRAM (resistive random-access memory) as the annealing temperature of the insulating layer was varied between 100 °C, 150 °C, and 200 °C. The fabricated RRAM device with a multi-stacked insulating layer annealed at 200 °C showed relatively good switching properties with a high on/off ratio (∼10 4 ) and low V SET (3.5 ± 0.29 V) and V RESET (−1.81 ± 0.10
The use of easy synthesis methodology, high performance, and stable electrode materials is mandatory while developing potential energy storage devices on a mass scale. In the present work, room-temperature operating, a simple solution method is employed for obtaining ultrathin bismuth oxide chloride (BiOCl) supercapacitor electrode material over 3D nickel-foam. This free-standing BiOCl ultrathin petal-type electrode material was characterized for confiming the crystal strcture, surface morpholog
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