A5050151838- Organic Electronics and Photovoltaics
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Thin-Film Transistor Technologies
- Advanced Thermoelectric Materials and Devices
- Semiconductor materials and devices
- ZnO doping and properties
- Electrohydrodynamics and Fluid Dynamics
- Solar-Powered Water Purification Methods
- Advanced Memory and Neural Computing
- Nuclear Materials and Properties
- Organic Light-Emitting Diodes Research
- Gas Sensing Nanomaterials and Sensors
- Quantum Dots Synthesis And Properties
- Graphene research and applications
- Chalcogenide Semiconductor Thin Films
- Perovskite Materials and Applications
- Nanomaterials and Printing Technologies
- Thermal Radiation and Cooling Technologies
- Solar Thermal and Photovoltaic Systems
- Nuclear reactor physics and engineering
- Analytical Chemistry and Sensors
- Electrowetting and Microfluidic Technologies
- Transition Metal Oxide Nanomaterials
- Nanowire Synthesis and Applications
Korea National University of Transportation
2007-2024
Korea Atomic Energy Research Institute
2012-2022
Chungbuk National University
2022
Korea Advanced Institute of Science and Technology
2006-2020
Government of the Republic of Korea
2015-2020
University of Minnesota
2020
Pohang University of Science and Technology
2012-2019
Hanyang University
2017-2019
Daejeon University
2018-2019
Seoul Institute
2017
A stretchable resistive pressure sensor is achieved by coating a compressible substrate with highly electrode. The contains an array of microscale pyramidal features, and the electrode comprises polymer composite. When pressure-induced geometrical change experienced maximized at 40% elongation, sensitivity 10.3 kPa−1 achieved.
Organic electronic devices require a passivation layer that protects the active layers from moisture and oxygen because most organic materials are very sensitive to such gases. Passivation films for encapsulation of need excellent stability mechanical properties. Although Al2O3 obtained with plasma enhanced atomic deposition (PEALD) have been tested as their gas barrier properties, amorphous significantly corroded by water. In this study, we examined deformation PEALD when immersed in water...
Abstract Very recently, MXene‐based wearable hydrogels have emerged as promising candidates for epidermal sensors due to their tissue‐like softness and unique electrical mechanical properties. However, it remains a challenge achieve with reliable sensing performance prolonged service life, because MXene inevitably oxidizes in water‐containing system of the hydrogels. Herein, catechol‐functionalized poly(vinyl alcohol) (PVA‐CA)‐based is proposed inhibit oxidation MXene, leading rapid...
Abstract Establishing dependable, cost-effective electrical connections is vital for enhancing device performance and shrinking electronic circuits. MXenes, combining excellent conductivity, high breakdown voltage, solution processability, two-dimensional morphology, are promising candidates contacts in microelectronics. However, their hydrophilic surfaces, which enable spontaneous environmental degradation poor dispersion stability organic solvents, have restricted certain applications....
PtO2 nanocatalysts-loaded SnO2 multichannel nanofibers (PtO2-SnO2 MCNFs) were synthesized by single-spinneret electrospinning combined with apoferritin and two immiscible polymers, i.e., poly(vinylpyrrolidone) polyacrylonitrile. The apoferritin, which can encapsulate nanoparticles within a small inner cavity (8 nm), was used as catalyst loading template for an effective functionalization of the catalysts. Taking advantage structure high porosity, activation catalysts on both interior...
Preventing reactive gas species such as oxygen or water is important to ensure the stability and durability of organic electronics. Although inorganic materials have been predominantly employed protective layers, their poor mechanical property has hindered practical application flexible The densely packed hexagonal lattice carbon atoms in graphene does not allow transmission small molecules. In addition, its outstanding flexibility optical transmittance are expected be useful overcome...
Photoresponsive transistor memories that can be erased using light-only bias are of significant interest owing to their convenient elimination stored data for information delivery. Herein, we suggest a strategy improve light-erasable organic memories, which enables fast "photoinduced recovery" under low-intensity light. CdSe quantum dots (QDs) whose surfaces covered with three different molecules introduced as photoactive floating-gate interlayers in memories. We determine QDs capped or...
We report a flexible hydrogen sensing platform based on single-strand yarn consisting of high-density electrospun nanofibers, which nanograined Pd or Pd@Pt is coated via spinning followed by sputter deposition. In general, undergoes phase transition to PdHx (α-PdHx at [H2] < 1% and β-PdHx > 2%), in H atoms act as electron scattering centers, thus increasing the resistance. our system, sensors exhibit switchable H2 behaviors, that is, (i) ΔR/R0 0 active (ii) derived from effects. Due high...
Abstract Metal oxide nanosheets having high mesoporosity, grain size distribution of 5–10 nm, and ultrathin thickness have attracted much attention due to their intriguing properties such as surface‐to‐volume ratio superior chemical activities. However, 2D nanostructures tend restack, inducing a decrease in accessible surface area number pores. To solve this problem, herein, unique synthetic method crumpled metal using spray pyrolysis ion–coated graphene oxide, followed by heat treatment, is...
Electrohydrodynamic jet printing is a promising technology for high-resolution direct printing. This review provides comprehensive summary of the fabrication and methods various functional materials (and inks) practical devices.
Abstract MXenes are interesting 2D materials that have been considered as attractive frontier for potential applications in the fields of energy and electronic devices due to their excellent optoelectronic properties including metallic conductivity high optical transparency. However, it is still challenging achieve compatibility as‐synthesized MXene nanosheets with simple solution‐deposition patterning processes because limited solubility many solvents. Here, a promising strategy developed...
Optical memories based on photoresponsive organic field-effect transistors (OFETs) are of great interest due to their unique applications, such as multibit storage and flexible imaging circuits. Most studies OFET-type have focused the active channels, but more useful functions can be additionally given devices by using floating gates that absorb light. In this case, effects photoirradiation photoactive floating-gate layers need fully understood. Herein, we studied photoinduced erasing...
In this work, we introduce a chitosan–Pt complex (CS–Pt) as an effective template for catalytic Pt sensitization and creation of abundant mesopores in SnO<sub>2</sub> nanofibers (NFs).
Abstract Self‐healable and stretchable energy‐harvesting materials can provide a new avenue for the realization of self‐powered wearable electronics, including electronic skins, whose main are required to be robust stable under external damage severe mechanical stresses. However, thermoelectric (TE) showing both self‐healing properties stretchability have not yet been demonstrated despite their great potential harvest thermal energy in human body. As most existing TE either mechanically...
Organic thermoelectric (TE) materials have great potential as sustainable energy sources for powering flexible and wearable electronic devices via harvesting of human body heat. Recent advances in soluble conjugated polymer/carbon nanotube (CNT) composites facilitated achievement high TE power factors. However, the effects polymers on debundling electrical percolation CNTs properties their are not yet fully understood. Herein, we introduce a novel type polymer/CNT composite composed...
Abstract Perovskite nanocrystals (PNCs) are attractive photoactive materials in various optoelectronic devices including light‐emitting diodes, solar cells, and photodetectors. However, the weakly bound surface ligands on PNCs reduce colloidal stability cause film formation patterning difficulties, severely restricting their practical applications. Herein, a rationally designed photocrosslinkable zwitterionic (PZ) ligand is introduced to obtain directly patternable CsPbBr 3 with enhanced...
Abstract This study introduces a hydrothermal synthesis method that uses glucose and Cu 2+ ions to create Cu‐nanoparticle (NP)‐decorated carbonaceous carbon hybrid material (Cu–HTCC). Glucose serves both as reducing agent, efficiently transforming into elemental nanostructures, precursor for HTCC microstructures. An enhanced plasmon‐induced electric field resulting from NPs supported on microstructure matrices, coupled with distinctive localized π‐electronic configuration in the material,...
Conductive MWCNT/PSS composites have been directly patterned <italic>via</italic> electrohydrodynamic printing for application as source/drain electrodes in organic field-effect transistors.
In this study, direct micropatterning lines of poly(3-hexylthiophene) (P3HT) without any polymer binder were prepared by electrohydrodynamic jet printing to form organic field-effect transistors (OFETs). We controlled the dielectric surface introducing self-assembled monolayers and thin films investigate effect modifications on characteristics printed P3HT electrical performances OFETs. The morphology depended energy type substrate. resulting OFETs exhibited high performance...
Complementary inverters consisting of p-type organic and n-type metal oxide semiconductors have received considerable attention as key elements for realizing low-cost large-area future electronics. Solution-processed ZnO thin-film transistors (TFTs) great potential use in hybrid complementary load because the low cost their fabrication process natural abundance active materials. The integration a single TFT into an inverter requires development simple patterning method alternative to...