Jongyun Choi

Upcycling battery scrap into commercial-grade graphite anode materials via coal tar-assisted granulation

Jongyun Choi, Tae Hun Kim, Gyujin Song, Sei-Min Park et autres

kr (code pays fourni par la source)

Exciton dynamics in marginally twisted WS e 2 homobilayer: Role of interlayer coupling, phonons, and intervalley scattering

Hansol Kim, Gyusu Lee, J.S. Kim, Jiwon Park et autres

In moiré materials, excitons serve as optical probes because of the sensitivity to both valley-dependent electronic structure and many-body excitonic interactions. For angle-tuned twisted bilayers, lattice reconstruction becomes significant at marginal twist angles, raising interesting questions about the optical characteristics of excitons …

jp (code pays fourni par la source)

Interstitially Bridged van der Waals Interface Enabling Stacking-Fault-Free, Layer-by-Layer Epitaxy

Taejoon Mo, Yong‐Sung Kim, Changwon Choi, Gunho Moon et autres

van der Waals (vdW) crystals are prone to twisting, sliding, and buckling due to inherently weak interlayer interactions. While thickness-controlled vdW structures have attracted considerable attention as ultrathin semiconducting channels, the deterministic synthesis of stacking-fault-free multilayers remains a persistent challenge. Here, we …

kr, us (code pays fourni par la source)

Functionalization of 5-hydroxyindole-based i-melanin pigment for hair dyeing and UV-protective applications

Chan-Seo Yeo, Jongyun Choi, Hee‐Jung Kim, Joo Hee Chung et autres

kr (code pays fourni par la source)

Enhanced Resistive Switching and Conduction Mechanisms in Silk Fibroin-Based Memristors with Ag Nanoparticles for Bio-Neuromorphic Applications

Jongyun Choi, Seung Hun Lee, Taehun Kim, Kyungtaek Min et autres

This study explores the resistive switching (RS) behavior and conduction mechanisms of Ag/SF-Ag NP/Si memristors with varying Ag NP concentrations. I-V measurements confirm stable RS characteristics across 100 cycles, with consistent set and reset voltages. Increasing Ag NP concentration enhances conductive filament …

Capacitance and Dielectric Properties of Spin-Coated Silk Fibroin Thin Films for Bioelectronic Capacitors

Jongyun Choi, Seung Hun Lee, Taehun Kim, Kyungtaek Min et autres

Silk fibroin, a biocompatible and flexible biopolymer derived from Bombyx mori silkworms, has shown promise in bioelectronics, due to its adjustable dielectric properties. This study investigates the influence of spin coating parameters on the optical, electrical, and dielectric properties of thin silk …

Eco-friendly recycling of coke waste: Transforming steel manufacturing waste into high-purity graphite for lithium-ion batteries

Jongyun Choi, Sei-Min Park, Jung‐Chul An, Hai Woong Park et autres

kr (code pays fourni par la source)

Efficient production of activated carbons from PET for organic supercapacitor applications: A single-step approach

Jongyun Choi, Wonjong Jung, Ji Chul Jung

kr (code pays fourni par la source)

Advances in Carbon Xerogels: Structural Optimization for Enhanced EDLC Performance

Jongyun Choi, Ji Chul Jung, Wonjong Jung

This review explores the recent progress on carbon xerogels (CXs) and highlights their development and use as efficient electrodes in organic electric double-layer capacitors (EDLCs). In addition, this work examines how the adjustment of synthesis parameters, such as pH, polymerization duration, and …

kr (code pays fourni par la source)

Oxide Semiconductor Memristor‐Based Optoelectronic Synaptic Devices With Quaternary Memory Storage

Jeong‐Hyeon Kim, Hye Jin Lee, Hee‐Jin Kim, Jongyun Choi et autres

Abstract A pioneering integration of oxide semiconductor memristors with optoelectronic features is presented, surpassing binary limitations to realize multi‐valued synaptic operations. Through Pt/Ga2O3/Pt memristors, their structural and electronic attributes via atomic force microscopy, X‐ray diffraction, and X‐ray photoelectron spectroscopy are explored. Demonstrating …

kr (code pays fourni par la source)

Efficient Production of Activated Carbons from Pet for Organic Supercapacitor Applications: A Single-Step Approach

Jongyun Choi, Wonjong Jung, Ji Chul Jung

kr (code pays fourni par la source)

Efficient Production of Activated Carbons from Pet for Organic Supercapacitor Applications: A Single-Step Approach

Jongyun Choi, Wonjong Jung, Ji Chul Jung

kr (code pays fourni par la source)