A5100701930- GaN-based semiconductor devices and materials
- Advanced Sensor and Energy Harvesting Materials
- ZnO doping and properties
- Spectroscopy and Quantum Chemical Studies
- Gas Sensing Nanomaterials and Sensors
- Ga2O3 and related materials
- Intermetallics and Advanced Alloy Properties
- Theoretical and Computational Physics
- Engineering Applied Research
- Semiconductor materials and devices
- Advanced Thermodynamics and Statistical Mechanics
- Surfactants and Colloidal Systems
- Analytical Chemistry and Sensors
- 3D Printing in Biomedical Research
- Optimal Experimental Design Methods
- Thin-Film Transistor Technologies
- Polymer Surface Interaction Studies
- Metal and Thin Film Mechanics
- Food Quality and Safety Studies
- Nanomaterials and Printing Technologies
- Advanced Chemical Sensor Technologies
- Additive Manufacturing and 3D Printing Technologies
- Electrostatics and Colloid Interactions
- Nonlinear Dynamics and Pattern Formation
- Conducting polymers and applications
Korea Institute of Industrial Technology
2021-2025
Yonsei University
2014-2024
Osaka University
2023-2024
Virginia Commonwealth University
2023
Hanyang University
2017-2023
Grinnell College
2021
Korea Research Institute of Bioscience and Biotechnology
2018-2021
Korea University of Science and Technology
2020-2021
Yale University
2014-2020
Korea University
2013-2020
The development of methods for the 3D printing multifunctional devices could impact areas ranging from wearable electronics and energy harvesting to smart prosthetics human-machine interfaces. Recently, stretchable electronic has accelerated, concomitant with advances in functional materials fabrication processes. In particular, novel strategies have been developed enable intimate biointegration human skin ways that bypass mechanical thermal restrictions traditional microfabrication...
Abstract A bioengineered spinal cord is fabricated via extrusion‐based multimaterial 3D bioprinting, in which clusters of induced pluripotent stem cell (iPSC)‐derived neuronal progenitor cells (sNPCs) and oligodendrocyte (OPCs) are placed precise positions within printed biocompatible scaffolds during assembly. The location a cluster cells, single type or multiple types, controlled using point‐dispensing printing method with 200 µm center‐to‐center spacing 150 wide channels. bioprinted sNPCs...
Chronic problems of zinc (Zn) metal anodes, such as notorious dendrite growth and continuous side corrosion reactions, hamper the commercialization aqueous zinc-ion batteries (ZIBs). Herein, we have demonstrated significance surface properties Zn anodes for suppressing parasitic reactions growth. On basis findings, successfully stabilized by building a thin hydrophilic artificial solid electrolyte interphase (SEI) layer via simple dip-coating method. The SEI effectively inhibits guarantees...
OLED arrays were fully 3D-printed under ambient conditions to produce a flexible information display technology.
Poly(N-substituted glycine) "peptoids" are a class of peptidomimetic molecules receiving significant interest as engineered biomolecules. Sarcosine (i.e., poly(N-methyl glycine)) has the simplest side chain chemical structure this family. In Article, we demonstrate that surface-grafted polysarcosine (PSAR) brushes exhibit excellent resistance to nonspecific protein adsorption and cell attachment. Polysarcosine was coupled mussel adhesive protein-inspired DOPA-Lys pentapeptide, which enabled...
A porous medium is a special type of material where voids are created in solid medium. The introduction pores into bulk can profoundly affect its physical properties and enable interesting mechanisms. In this paper, we report the use mesoporous GaN to address long-standing challenge devices: tuning optical index epitaxial structures without compromising structural electrical properties. By controlling doping electrochemical etching bias, able control pore morphology from macro- meso-...
We fabricate high-performance, flexible, transparent electrochromic (EC) films and thin film heaters (TFHs) on an ITO/Cu/ITO (ICI) multilayer electrode prepared by continuous roll-to-roll (RTR) sputtering of ITO Cu targets. The RTR-sputtered ICI a 700 mm wide PET substrate at room temperature exhibits sheet resistance 11.8 Ω/square optical transmittance 73.9%, which are acceptable for the fabrication flexible EC TFHs. effect interlayer thickness electrical properties was investigated in...
Abstract Extrusion‐based 3D printing, an emerging technology, has been previously used in the comprehensive fabrication of light‐emitting diodes using various functional inks, without cleanrooms or conventional microfabrication techniques. Here, polymer‐based photodetectors exhibiting high performance are fully printed and thoroughly characterized. A semiconducting polymer ink is optimized for active layer photodetector, achieving external quantum efficiency 25.3%, which comparable to that...
The glycocalyx of the cell is composed highly hydrated saccharidic groups conjugated to protein and lipid cores. Although components are important in cell–cell interactions other specific biological recognition events, a fundamental role inhibition nonspecific at surface. Inspired by glycoproteins present glycocalyx, we describe new class synthetic antifouling polymer saccharide containing N-substituted polypeptide (glycopeptoid). Grafting glycopeptoids solid surface resulted biomimetic...
Neural regeneration devices interface with the nervous system and can provide flexibility in material choice, implantation without need for additional surgeries, ability to serve as guides augmented physical, biological (e.g., cellular), biochemical functionalities. Given complexity challenges associated neural regeneration, a 3D printing approach design manufacturing of could next-generation opportunities advanced via production anatomically accurate geometries, spatial distributions...
Biocatalytic cyclization is highly desirable for efficient synthesis of biologically derived chemical substances, such as the commodity chemicals ε-caprolactam and δ-valerolactam. To identify biocatalysts in lactam biosynthesis, we develop a caprolactam-detecting genetic enzyme screening system (CL-GESS). The Alcaligenes faecalis regulatory protein NitR adopted specific detection compounds against biosynthetic intermediates. We further systematically optimize components CL-GESS to enhance...
Material systems that can be used to flexibly and precisely define the chemical nature molecular arrangement of a surface would invaluable for control complex biointerfacial interactions. For example, progress in antifouling polymer biointerfaces prevent non-specific protein adsorption cell attachment, which significantly improve performance an array biomedical industrial applications, is hampered by lack models identify features conferring their properties. Poly(N-substituted glycine)...
Single crystalline nanomembranes (NMs) represent a new embodiment of semiconductors having two-dimensional flexural character with comparable perfection and optoelectronic efficacy. In this Letter, we demonstrate the preparation GaN NMs freestanding thickness between 90 to 300 nm. Large-area (>5 × 5 mm(2)) can be routinely obtained using procedure conductivity-selective electrochemical etching. NM is atomically flat possesses an optical quality similar that from bulk GaN. A light-emitting...
Abstract The design and development of novel methodologies customized materials to fabricate patient‐specific 3D printed organ models with integrated sensing capabilities can yield advances in smart surgical aids for preoperative planning rehearsal. Here, prostate are demonstrated physical properties tissue soft electronic sensors using custom‐formulated polymeric inks. show high quantitative fidelity static dynamic mechanical properties, optical characteristics, anatomical geometries...
Abstract 3D printing of conductive elastomers is a promising route to personalized health monitoring applications due its flexibility and biocompatibility. Here, one‐part, highly conductive, flexible, stretchable, printable carbon nanotube (CNT)‐silicone composite developed thoroughly characterized. The one‐part nature the inks: i) enables without prior mixing cures under ambient conditions; ii) allows direct dispensing at ≈100 µm resolution printability on nonpolar polar substrates; iii)...
Abstract Most reported thin-film piezoelectric energy harvesters have been based on cantilever-type crystalline ferroelectric oxide thin films deposited rigid substrates, which utilize vibrational input sources. Herein, we introduce flexible amorphous perovskite CaCu 3 Ti 4 O 12 (CCTO) a plastic substrate for highly competitive electromechanical harvesting. The room-temperature sputtering of CCTO enable the use substrates to secure reliable flexibility, has not available thus far....