A5027444361- ZnO doping and properties
- Graphene research and applications
- Ga2O3 and related materials
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- 2D Materials and Applications
- Advanced Photocatalysis Techniques
- Nanowire Synthesis and Applications
- Thermal Radiation and Cooling Technologies
- Acoustic Wave Resonator Technologies
- Advanced Sensor and Energy Harvesting Materials
- Thermal properties of materials
- Analytical Chemistry and Sensors
- Conducting polymers and applications
- Advanced Thermoelectric Materials and Devices
- GaN-based semiconductor devices and materials
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Semiconductor materials and devices
- Organic Electronics and Photovoltaics
- Advanced Memory and Neural Computing
- Graphene and Nanomaterials Applications
- Multiferroics and related materials
- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
Dongguk University
2014-2024
Government of the Republic of Korea
2015-2017
Seoul Institute
2017
Abstract Micro-fabricated single-layer graphenes (SLGs) on a silicon dioxide (SiO 2 )/Si substrate, nitride (SiN) membrane, and suspended architecture are presented for their use as temperature sensors. These graphene sensors act resistance detectors, showing quadratic dependence of the in range between 283 K 303 K. The observed change explained by dependent electron mobility relationship (~T −4 ) electron-phonon scattering. By analyzing transient response SLG different substrates, it is...
A highly flexible electro thermal heater has been demonstrated by functionalizing cotton fabrics using CNT.
4H-SnS2 layered crystals synthesized by a hydrothermal method were used to obtain via liquid phase exfoliation quantum dots (QDs), consisting of single layer (SLQDs) or multiple layers (MLQDs). Systematic downshift the peaks in Raman spectra with decrease size was observed. The bandgap QDs, estimated UV-visible absorption spectroscopy and tunneling current measurements using graphene probes, increases from 2.25 eV 3.50 decreasing size. 2-4 nm SLQDs, which are transparent visible region, show...
Recently, two-dimensional (2D) metal chalcogenides are gaining considerable attention for its potential employment in energy storage, catalysis, electronic, and sensing devices. Vanadium disulfide (VS2) from the 2D family gathers intensive application as promising electrocatalysts hydrogen evolution reaction (HER). Here, we present a simple, cost-effective hydrothermal technique synthesis of nanodiscs (NDs)-like VS2 structures. They were characterized by X-ray diffraction (XRD), Raman...
In this work, 2D g-C 3 N 4 nanosheets were employed as a sensitive interface for high-performance NO 2 SAW gas sensors, operating at various environmental conditions. The immense sensitivity to is attributed the enhanced mass loading effect.
Blue-white light emission was obtained from glass/indium tin oxide (ITO)/n-ZnO nanorod array (NRA)/p+-Si vertical contact emitting diodes (VCLEDs). The nanoscale p-n heterojunction VCLEDs were formed by direct engagement n−-tips of n-ZnO NRA grown vertically on an ITO/glass substrate with p+-Si wafer. Proposed configuration the VCLED allows creating a high density (∼109 cm−2) self-assembled ZnO/Si nanodiodes point junctions quality due to structural perfection Si wafer and tips ZnO nanorods...
Tin monosulfide (SnS) nanostructures have attracted huge attention recently because of their high absorption coefficient, photoconversion efficiencies, low energy cost, ease deposition, and so on. Here, in this paper, we report on the low-cost hydrothermal synthesis self-assembled SnS nanoflake-like structures terms performance for photodetectors. High-performance photodetectors were fabricated using nanoflakes as active layers graphene lateral electrodes. The exhibited excellent...
A photovoltaic device was successfully grown solely based on the single ZnO p–n homojunction nanowire. The nanowire diode consists of an as-grown n-type segment and in situ arsenic-doped p-type segment. This acts as a good cell, producing photocurrent almost 45 times larger than dark current under reverse-biased conditions. Our results demonstrate that present can be used self-powered ultraviolet photodetector well which also ultralow electrical power source for nanoscale electronic,...
Using X-ray photoemission microscopy, we discovered that oxidation of commercial large-scale graphene on Cu foil, which typically has bilayer islands, by atomic oxygen proceeds with the formation specific structures: though relatively mobile epoxy groups are generated uniformly across surface single-layer graphene, their concentration is significantly lower for islands. More oxidized species like carbonyl and lactones preferably located at centers these Such structures randomly distributed...
Abstract MoS 2 2D nanosheets (NS) with intercalated 0D quantum dots (QDs) represent promising structures for creating low‐dimensional (LD) resistive memory devices. Nonvolatile memristors based materials demonstrate low power consumption and ultrahigh density. Here, the observation of a photoinduced phase transition in NS/0D QDs structure providing dynamic is reported. The switching NS/QD observed an electric field can be controlled through local QD excitations. Photoexcitation LD at...
Photocatalytic oxidation of graphene with ZnO nanoparticles was found to create self-assembled oxide/graphene (G/GO) photosensitive heterostructures, which can be used as memristors. Oxygen groups released during photodecomposition water molecules on the under ultraviolet light, oxidized graphene, locally forming G/GO heterojunctions ultra-high density. The nanostructures have non-linear current-voltage characteristics and switch resistance in dark white providing four resistive states at...
Tin sulfides are promising materials in the fields of photoelectronics and photovoltaics because their appropriate energy bands. However, doping SnS2 can improve stability robustness this material potential applications. Herein, we report synthesis nanoflakes with Zn via simple hydrothermal route. The effect was found to display a huge influence structural crystalline order as synthesized SnS2. Their optical properties attest results reduction band gap which benefits strong visible-light...
Ferromagnetic materials have been attracting great interest in the last two decades due to their application spintronics devices. One of hot research areas magnetism is currently two-dimensional materials, transition metal dichalcogenides (TMDCs), which unique physical properties. The origins and mechanisms especially correlation between defects, studied recently. We investigate changes magnetic properties with a variation annealing temperature for nanoscale compound MoS2. pristine MoS2...