Korea Advanced Institute of Science and Technology · Engineering
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 and micro/nano-structured materials. The lab investigates size-dependent mechanical responses using advanced experimental techniques such as micro-cantilever bending and micro-pillar compression, combined with high-fidelity finite element modeling to validate higher-order theories like couple stress and strain gradient elasticity. Key research directions include enhancing the stretchability and fatigue resistance of printed and evaporated silver films on polymer substrates, as well as quantifying intrinsic length scale parameters in polycrystalline materials. The lab's work bridges fundamental mechanics with practical applications in next-generation flexible and wearable electronic devices.
Figures are computed from collected data and may differ slightly.
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
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