A5029537277- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- ZnO doping and properties
- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Diamond and Carbon-based Materials Research
- Electronic and Structural Properties of Oxides
- Copper Interconnects and Reliability
- Gas Sensing Nanomaterials and Sensors
- Fuel Cells and Related Materials
- Advanced Photocatalysis Techniques
- Advanced battery technologies research
- Thin-Film Transistor Technologies
- Block Copolymer Self-Assembly
- Supercapacitor Materials and Fabrication
- Copper-based nanomaterials and applications
- Advanced ceramic materials synthesis
- MXene and MAX Phase Materials
- Advanced Memory and Neural Computing
- 2D Materials and Applications
- Metal Alloys Wear and Properties
- Advanced Sensor and Energy Harvesting Materials
- Silicon and Solar Cell Technologies
- Advancements in Battery Materials
- Microstructure and Mechanical Properties of Steels
Pusan National University
2016-2025
Government of the Republic of Korea
2019
Global Frontier Hybrid Interface Materials
2016-2018
Busan National University of Education
2016
Core Research Center
2011
Korea Advanced Institute of Science and Technology
2004-2010
Kootenay Association for Science & Technology
2008
Texas A&M University
2005-2007
Abstract Transparent electrodes have been widely used in electronic devices such as solar cells, displays and touch screens. Highly flexible transparent are especially desired for the development of next generation devices. Although indium tin oxide (ITO) is most commonly material fabrication electrodes, its brittleness growing cost limit utility Therefore, need new conductive materials with superior mechanical properties clear urgent. Ag nanowire (AgNW) has attracting increasing attention...
Here, we report that Nb doping of two-dimensional (2D) MoSe2 layered nanomaterials is a promising approach to improve their gas sensing performance. In this study, atoms were incorporated into 2D host matrix, and the concentration could be precisely controlled by varying number Nb2O5 deposition cycles in plasma enhanced atomic layer process. At relatively low dopant concentrations, showed device durability as well NO2 response, attributed its small grains stabilized grain boundaries....
A universal block copolymer lithography is developed for a broad spectrum of materials including metals, semiconductors, ceramics, and polymers by combining advanced film deposition techniques with lithography. The figure presents nanopatterned platinum prepared applying
Abstract The performance of proton exchange membrane fuel cells (PEMFCs) depends on the controlled size, dispersion and density Pt nanoparticles (NPs) carbon supports, which are strongly affected by characteristics fabrication methods. Here, we demonstrated a high-performance Pt/carbon catalyst for PEMFCs using fluidized bed reactor atomic layer deposition (FBR-ALD) that was realized an effective matching supports FBR-ALD process optimization ionomer content during preparation electrode...
A new approach was adopted to improve the corrosion resistance of CrN hard coatings by inserting a Al2O3 layer through atomic deposition. The influence addition interlayer, its thickness, and position insertion on microstructure, surface roughness, behavior, mechanical properties investigated. results indicated that dense deposited interlayer led significant decrease in average grain size roughness greatly improved durability while maintaining their properties. Increasing thickness altering...
Small machines are highly promising for future medicine and new materials. Recent advances in functional nanomaterials have driven the development of synthetic inorganic micromachines that capable efficient propulsion complex operation. Miniaturization large‐scale manufacturing these tiny with true nanometer dimension crucial compatibility subcellular components molecular Here, block copolymer lithography is combined atomic layer deposition wafer‐scale fabrication ultrasmall coaxial TiO 2...
Abstract 2D layered materials with sensitive surfaces are promising for use in chemical sensing devices, owing to their extremely large surface‐to‐volume ratios. However, most sensors based on used the form of laterally defined active channels, which area is limited actual device dimensions. Therefore, a novel approach fabricating self‐formed active‐channel devices proposed semiconductor very surface areas, and potential gas ability examined. First, vertical growth phenomenon SnS 2...
Area-selective atomic layer deposition (AS-ALD) is a promising bottom-up patterning approach for fabricating conformal thin films. One of the current challenges with respect to AS-ALD deficiency surface inhibitor used nanoscale three-dimensional structures. In this study, vapor-deliverable small called ethanethiol (ET) that thermally adsorbs on surfaces was Al2O3. The selectively adsorbed Co and Cu substrates but not SiO2 substrate, allowing selective deactivation in Al2O3 ALD. use...
Nanotransfer printing (nTP) has attracted considerable attention due to its good pattern resolution, process simplicity, and cost-effectiveness. However, the development of a large-area nTP been hampered by critical reliability issues related uniform replication regular transfer functional nanomaterials. Here, we present very practical thermally assisted nanotransfer (T-nTP) that can easily produce well-ordered nanostructures on an 8-inch wafer via use heat-rolling press system provides both...
Ruthenium thin films were produced by plasma-enhanced atomic layer deposition (PEALD) using an alternating supply of bis(ethylcyclopentadienyl)ruthenium and plasma at a temperature 270°C. The film thickness per cycle was self-limited 0.038 nm/cycle, which thinner than the obtained from conventional ALD oxygen instead plasma. ruthenium prepared with PEALD had preferential orientation toward (002), it progressively promoted power. shows merit in controlling ultrathin less 2 nm more precisely...
Plasma-enhanced atomic layer deposition (PEALD) of ruthenium thin films was performed using an alternate supply bis(ethylcyclopentadienyl)ruthenium and plasma. plasma acted as effective reducing agent for The film formed during one cycle saturated at 0.038 nm/cycle, its resistivity No carbon or nitrogen impurities were incorporated in the determined by elastic recoil detection time flight. density higher than that a conventional ALD, which oxygen used. root-mean-square surface roughness 50...
Hybrid tandem solar cells comprising an inorganic bottom cell and organic top have been designed fabricated. The interlayer combination thickness matching were optimized in order to increase the overall photovoltaic conversion efficiency. A maximum power efficiency of 5.72% was achieved along with a Voc 1.42 V, reaching as high 92% sum subcell values. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or...
Because of its excellent charge carrier mobility at the Dirac point, graphene possesses exceptional properties for high-performance devices. Of particular interest is potential use nanoribbons or nanomesh field-effect transistors. Herein, highly aligned DNA nanowire arrays were crafted by flow-assisted self-assembly a drop aqueous solution on flat polymer substrate. Subsequently, they exploited as "ink" and transfer-printed chemical vapor deposited (CVD)-grown The oriented nanowires served...
5‐nm‐scale line and hole patterning is demonstrated by synergistic integration of block copolymer (BCP) lithography with atomic layer deposition (ALD). While directed self‐assembly BCPs generates highly ordered array or hexagonal dot the pattern periodicity 28 nm minimum feature size 14 nm, density multiplication employing ALD successfully reduces down to 5 nm. Self‐limiting process enable low temperature, conformal thick spacer directly at surface organic BCP patterns. This assisted...
The specific capacitance and energy density of antimony trisulfide (Sb2S3)@carbon supercapacitors (SCs) have been limited are in need significant improvement. In this work, Sb2S3 nanoparticles were selectively encapsulated or anchored a sulfur-doped carbon (S-carbon) sheet depending on the use microwave-assisted synthesis. microwave-triggered nanoparticle growth resulted core–shell hierarchical spherical particles uniform diameter assembled with as core an S-carbon layer shell (Sb2S3-M@S-C)....
To fabricate high efficiency photoanodes for water oxidation, it is highly required to engineer their nanoporous architecture and interface improve the charge separation transport efficiency. By focusing on this aspect, we developed hierarchical BiVO4 (BV) from solution processed two-dimensional BiOI (BI) crystals. The orientation of BI crystals was controlled by changing solvent volume ratios ethylene glycol (EG) ethanol (ET), which resulted in different planar BV morphologies through a...
The high-Mn austenitic steels exhibit fully structure at room temperatures while showing twinning mechanisms during deformations. In the SAW welding process, microstructure and mechanical properties of heat affected zone (HAZ) weld metal (WM) are by causing potential degradation due to segregation depletion Mn in HAZ WM regions. this study, post treatment (PWHT) was performed 800 °C, 900 °C 1000 improve welded steels. We examined electron backscattered diffraction (EBSD) energy dispersive...
Degradation of polymer electrolyte membrane fuel cell (PEMFC) systems has emerged as a critical issue. A thin metal oxide layer coated with Pt/carbon via ALD (atomic deposition) is one the potential approaches for preserving electrochemical activity; however, exact interfacial effects on enhancing PEMFC durability are unclear. Herein, engineering TiO2 layers within in situ-synthesized catalysts (Pt/TiO2/C and TiO2/Pt/C) was studied using fluidized bed reactor (FBR) to investigate catalysts....