A5008901666- Graphene research and applications
- Carbon Nanotubes in Composites
- Advanced Chemical Physics Studies
- Anodic Oxide Films and Nanostructures
- Nanowire Synthesis and Applications
- Catalytic Processes in Materials Science
- Boron and Carbon Nanomaterials Research
- Advancements in Battery Materials
- Silicon Nanostructures and Photoluminescence
- Electron and X-Ray Spectroscopy Techniques
- Ion-surface interactions and analysis
- Ga2O3 and related materials
- Semiconductor materials and devices
- MXene and MAX Phase Materials
- Radiation Effects in Electronics
- Surface and Thin Film Phenomena
- GaN-based semiconductor devices and materials
- Physics of Superconductivity and Magnetism
- Spacecraft and Cryogenic Technologies
- Fullerene Chemistry and Applications
- 2D Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Thin-Film Transistor Technologies
- Advancements in Photolithography Techniques
- nanoparticles nucleation surface interactions
Sungkyunkwan University
1999-2020
An unusually large bandgap modulation of 1.23-2.65 eV in monolayer MoS2 on a SiO2 /Si substrate is found due to the inherent local bending strain induced by surface roughness substrate, reaching direct-to-indirect transition. Approximately 80% area reveals an indirect bandgap, which confirmed further degraded photoluminescence compared that from suspended .
We introduce visible photoluminescences (PL) of violet (432 nm) and yellow (561 at room temperature from thermally treated silicon dioxide thin films. These luminescences were very strong with a near infinite degradation time. At an oxide layer thickness less than 200 nm, these not seen, even high annealing about 1000 °C. As result photoluminescence, x-ray photoelectron spectroscopy, Fourier transform infrared, high-resolution transmission electron microscopy measurements, we conclude that...
Here, we demonstrate the decoration of Ni nanoparticles (NPs) on graphene films by simple annealing for p-type doping graphene. Scanning electron microscopy and atomic force revealed that high-density, uniformly sized NPs were formed films. The density increased gradually, whereas size decreased with increasing NiCl 2 ·6H O solution concentration. formation was explained heat-driven dechlorination subsequent nano-particlization, as investigated X-ray photoelectron spectroscopy. effect onto...
The roles of metal nanoparticles (NPs) decorated on carbon nanotubes (CNTs) in the enhancement field emission properties were investigated by measuring work functions (WF), densities state (DOS), turn-on fields, current densities, and sizes NPs. RuO2 was deposited CNTs reduced to Ru annealing at elevated temperatures. WF decreased during reduction, integrated DOS increased after formation Consequently, showed strong correlation with WF, shape NPs had a more significant impact density than DOS.
Abstract Size-tailored Fe catalytic nanoparticles (NPs) were formed by a heat-driven evaporation process, and precise control of single-walled carbon nanotube (SWCNT) diameter was achieved. The size surface concentration NPs significantly decreased with increasing temperature, which investigated transmission electron microscopy (TEM) x-ray photoelectron spectroscopy. TEM Raman spectroscopy revealed that the synthesis SWCNTs an extremely narrow distribution achieved their can be manipulated...
There is an increasing need to systematically investigate the performance of commercial Cryo–TMP [in-line Cryogenic Water Pump (CWP) + Turbo Molecular (TMP)] combination pumps. In this study, factors affecting pumping speed water in a Cryo–TMP, such as number cold rings, dimensions, shape, etc., are analyzed by Monte Carlo simulation. We constructed test dome and Cryo–TMP500 based on simulation results measure strict effective Cryo–TMP. addition, we established systematic measurement method...
We have directly grown CNTs on the metal substrates by direct-current plasma-enhanced chemical-vapor deposition (DC-PECVD) using a gas mixture of C/sub 2/H/sub 2/ and NH/sub 3/ at relatively low temperature (550 /spl deg/C). In this study, we report field emission properties depending pattern sizes spacings. Field-emission characteristic was evaluated in vacuum 10/sup -6/ Torr parallel diode configuration. It is found that there correlation between morphologies (such as window area, spacing,...
Residual impurities on the surface of graphene after device fabrication degrade performance electronic devices. It is important to solve this issue in order use In study, we removed residues using four plasma treatment methods following photolithography process. The were hydrogen (Process 1, P 1 ), methane 2, 2 pre- and post-treatment 3, 3 hydrogen-methane mixed 4, 4 ). results analyzed atomic force microscopy Raman spectroscopy. Of treatments, Process showed most remarkable removal...
The Ag-adsorbed Si(110)2×16 surfaces were investigated using low-energy electron diffraction (LEED) and Auger spectroscopy (AES). When Ag was deposited on a surface at room temperature (RT) annealed several elevated temperatures, diffuse 1×1, 1×2+streak, 1×2, (-1, 6)×(-7, 0) structures observed by LEED. relative coverage of the reconstructed estimated from Ag(MNN)/Si(LVV) AES intensity ratios previous results. structural model Ag/Si(110)1×2 proposed LEED