Gi‐Dong Sim
Korea Advanced Institute of Science and Technology · 工学
研究室紹介
Professor Gi-Dong Sim's research lab specializes in the mechanical behavior and reliability of advanced materials for flexible and stretchable electronics, with a focus on nanoscale thin films, micro/nanomechanics, and size-dependent deformation mechanisms. The lab investigates the interplay between material microstructure, processing techniques—such as electron-beam evaporation and nanoparticle printing—and mechanical performance, particularly stretchability, fatigue resistance, and failure mechanisms. Using advanced experimental methods like micro-cantilever bending and micro-pillar compression, combined with computational modeling including couple stress and strain gradient theories, the lab explores size effects in both elastic and plastic regimes. Their work aims to enable next-generation sustainable, low-cost, and high-performance electronic systems for wearable and large-area applications.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
15Silicon-based microelectromechanical systems (MEMS) sensors have become ubiquitous in consumer-based products, but realization of an interconnected network of MEMS devices that allows components to be remotely monitored and controlled, a concept often described as the "Internet of Things," will require a suite of MEMS materials and properties that are not currently available. We report on the synthesis of metallic nickel-molybdenum-tungsten films with direct current sputter deposition, which res
In this paper, we report that silver films evaporated on poly-ethylene-terephthalate (PET) substrates coated with an acrylic primer can be stretched beyond 70% without fracture. As-deposited films show a larger failure strain than annealed coatings. These observations are rationalized in light of a ductile fracture mechanism where debonding from the substrate coevolves with strain localization. The results of this study indicate that PET substrates coated with an acrylic primer layer may be suit
Higher-order deformation theories, such as the couple stress and strain gradient theory, have been widely used to predict the mechanical behavior of micro/nano-scale structures. In this paper, the additional length scale parameter introduced in the couple stress theory is measured by performing bulk-scale tensile and micro-scale cantilever bending experiments. Bulk-scale characterization provided microstructural information of the polycrystalline copper plate along with macroscopic mechanical pr
Flexible electronics using nanoparticle (NP) printing has been highlighted as a key technology enabling eco-friendly, low-cost, and large-area fabrication. For NP-based printing to be used as a successive alternative to photolithography and vacuum deposition, stretchability and long term reliability must be considered. This paper reports the stretchability and fatigue behavior of 100 nm thick NP-based silver thin films printed on polyethylene-terephthalate substrate and compares it to films depo