Jae‐Ung Lee
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View article: Thermally Induced Irreversible Disorder in Interlayer Stacking of γ‐GeSe
Thermally Induced Irreversible Disorder in Interlayer Stacking of γ‐GeSe Open
The interlayer stacking shift in van der Waals (vdW) crystals represents an important degree of freedom to control various material properties, including magnetism, ferroelectricity, and electrical properties. On the other hand, the struct…
View article: Large‐Scale Analysis of Defects in Atomically Thin Semiconductors using Hyperspectral Line Imaging
Large‐Scale Analysis of Defects in Atomically Thin Semiconductors using Hyperspectral Line Imaging Open
Point defects play a crucial role in determining the properties of atomically thin semiconductors. This work demonstrates the controlled formation of different types of defects and their comprehensive optical characterization using hypersp…
View article: Mesoscopic Stacking Reconfigurations in Stacked van der Waals Film
Mesoscopic Stacking Reconfigurations in Stacked van der Waals Film Open
Mesoscopic‐scale stacking reconfigurations are investigated when van der Waals (vdW) films are stacked. A method to visualize complicated stacking structures and mechanical distortions simultaneously in stacked atom‐thick films using Raman…
View article: Indirect Band Gap in Scrolled MoS2 Monolayers
Indirect Band Gap in Scrolled MoS2 Monolayers Open
MoS2 nanoscrolls that have inner core radii of ∼250 nm are generated from MoS2 monolayers, and the optical and transport band gaps of the nanoscrolls are investigated. Photoluminescence spectroscopy reveals that a MoS2 monolayer, originall…
View article: Noncovalent Complexes of Cyclodextrin with Small Organic Molecules: Applications and Insights into Host–Guest Interactions in the Gas Phase and Condensed Phase
Noncovalent Complexes of Cyclodextrin with Small Organic Molecules: Applications and Insights into Host–Guest Interactions in the Gas Phase and Condensed Phase Open
Cyclodextrins (CDs) have drawn a lot of attention from the scientific communities as a model system for host–guest chemistry and also due to its variety of applications in the pharmaceutical, cosmetic, food, textile, separation science, an…
View article: Structural configurations and Raman spectra of carbon nanoscrolls
Structural configurations and Raman spectra of carbon nanoscrolls Open
Three types of carbon nanoscroll (CNS) structures that are formed when scrolling up graphene sheets are investigated using Raman spectroscopy and atomic force microscopy (AFM). The CNSs were produced from exfoliated monolayer graphene depo…
View article: Correction: Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus
Correction: Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus Open
Correction for ‘Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus’ by Jungcheol Kim et al., Nanoscale, 2015, 7, 18708–18715, DOI: 10.1039/C5NR04349B.
View article: Post Data Breach Use of Protective Technologies: An Examination of Users’ Dilemma
Post Data Breach Use of Protective Technologies: An Examination of Users’ Dilemma Open
This preliminary research addresses the technology use uncertainties that arise when users are presented with protective technologies following a data breach or privacy violation announcement. Prior studies have provided understanding of d…
View article: Wafer-scale synthesis of monolayer two-dimensional porphyrin polymers for hybrid superlattices
Wafer-scale synthesis of monolayer two-dimensional porphyrin polymers for hybrid superlattices Open
Single-layer porphyrin polymerization Two-dimensional polymers can be made as monolayer sheets through controlled synthesis at an interface. However, it is often difficult to create intact sheets over large areas that can be transferred on…
View article: Metallic Transition‐Metal Chalcogenides: Electrically Robust Single‐Crystalline WTe<sub>2</sub> Nanobelts for Nanoscale Electrical Interconnects (Adv. Sci. 3/2019)
Metallic Transition‐Metal Chalcogenides: Electrically Robust Single‐Crystalline WTe<sub>2</sub> Nanobelts for Nanoscale Electrical Interconnects (Adv. Sci. 3/2019) Open
In article number 1801370, Soon‐Yong Kwon and co‐workers investigate single‐crystalline WTe2 nanobelts from a eutectic metal alloy, which can be a prominent interconnect candidate because of their superior electrical performance and robust…
View article: Electrically Robust Single‐Crystalline WTe<sub>2</sub> Nanobelts for Nanoscale Electrical Interconnects
Electrically Robust Single‐Crystalline WTe<sub>2</sub> Nanobelts for Nanoscale Electrical Interconnects Open
As the elements of integrated circuits are downsized to the nanoscale, the current Cu‐based interconnects are facing limitations due to increased resistivity and decreased current‐carrying capacity because of scaling. Here, the bottom‐up s…
View article: Suggestion to Use Unmanned Vehicle with IoT about LoRa Network
Suggestion to Use Unmanned Vehicle with IoT about LoRa Network Open
무인이동체에 대한 연구가 지속적으로 이루어 져왔다. 현재까지 지속적인 연구의 결과 무인이동체의 상용화 소식이 들려온다. 또한, 다양한 분야에서 무인이동체를 적용해 왔다. 무인이동체를 실내에서 적용시키기 위해서도 또한, 많은 연구가 이루어져왔다. IoT전용 망인 LoRa망을 이용하여 작은 공간인 집이나 혹은 사무...
View article: Data for: Excitation energy dependence of Raman spectra of few-layer WS2
Data for: Excitation energy dependence of Raman spectra of few-layer WS2 Open
Electronic Supplementary Information
View article: Excitation energy dependence of Raman spectra of few-layer WS2
Excitation energy dependence of Raman spectra of few-layer WS2 Open
Raman spectra of few-layer WS2 have been measured with up to seven excitation energies, and peculiar resonance effects are observed. The two-phonon acoustic phonon scattering signal close to the main E2g1 peak is stronger than the main pea…
View article: Ising-Type Magnetic Ordering in Atomically Thin FePS<sub>3</sub>
Ising-Type Magnetic Ordering in Atomically Thin FePS<sub>3</sub> Open
Magnetism in two-dimensional materials is not only of fundamental scientific interest but also a promising candidate for numerous applications. However, studies so far, especially the experimental ones, have been mostly limited to the magn…
View article: The enhanced low resistance contacts and boosted mobility in two-dimensional p-type WSe2 transistors through Ar+ ion-beam generated surface defects
The enhanced low resistance contacts and boosted mobility in two-dimensional p-type WSe2 transistors through Ar+ ion-beam generated surface defects Open
We intentionally generated surface defects in WSe2 using a low energy argon (Ar+) ion-beam. We were unable to detect any changes in lattice structure through Raman spectroscopy as expected through simulation. Meanwhile, atomic force micros…
View article: Davydov Splitting and Excitonic Resonance Effects in Raman Spectra of Few-Layer MoSe<sub>2</sub>
Davydov Splitting and Excitonic Resonance Effects in Raman Spectra of Few-Layer MoSe<sub>2</sub> Open
Raman spectra of few-layer MoSe2 were measured with eight excitation energies. New peaks that appear only near resonance with various exciton states are analyzed, and the modes are assigned. The resonance profiles of the Raman peaks reflec…
View article: Raman Signatures of Polytypism in Molybdenum Disulfide
Raman Signatures of Polytypism in Molybdenum Disulfide Open
Since the stacking order sensitively affects various physical properties of layered materials, accurate determination of the stacking order is important for studying the basic properties of these materials as well as for device application…
View article: Raman Spectroscopic Studies on Two-Dimensional Materials
Raman Spectroscopic Studies on Two-Dimensional Materials Open
Raman spectroscopy is one of the most widely used tools in the field of graphene and two-dimensional (2D) materials.It is used not only to characterize structural properties such as the number of layers, defect densities, strain, etc., but…
View article: Anomalous excitonic resonance Raman effects in few-layered MoS<sub>2</sub>
Anomalous excitonic resonance Raman effects in few-layered MoS<sub>2</sub> Open
The resonance effects on the Raman spectra from 5 to 900 cm(-1) of few-layered MoS2 thin films up to 14-layers were investigated by using six excitation energies. For the main first-order Raman peaks, the intensity maximum occurs at ∼2.8 e…
View article: Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus
Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus Open
Crystallographic direction of black phosphorus can be determined from polarized optical microscopy and polarized Raman spectroscopy.