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Lee, Jinhwan,Lee, Phillip,Lee, Ha Beom,Hong, Sukjoon,Lee, Inhwa,Yeo, Junyeob,Lee, Seung Seob,Kim, Taek‐,Soo,Lee, Dongjin,Ko, Seung Hwan WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.34
<P>D. Lee, S. H. Ko, and co‐workers develop an alternative to rigid ITO transparent conductors. On page 4171, conducting polymer‐assisted nanosoldering of Ag nanowires allows them to develop nanowire percolation networks, which form highly flexible and stretchable transparent conductors. A large area transparent conductor and a flexible touch panel on a non‐flat surface are fabricated, demonstrating the possibility of cost‐effective mass production as well as the applicability of these networks to unconventional, non‐flat surfaces. </P>
Lee, Jinhwan,Lee, Phillip,Lee, Hyungman,Lee, Dongjin,Lee, Seung Seob,Ko, Seung Hwan RSC Pub 2012 Nanoscale Vol.4 No.20
<P>The future electronics will be soft, flexible and even stretchable to be more human friendly in the form of wearable computers. However, conventional electronic materials are usually brittle. Recently, carbon based materials are intensively investigated as a good candidate for flexible electronics but with limited mechanical and electrical performances. Metal is still the best material for electronics with great electrical properties but with poor transparency and mechanical performance. Here we present a simple approach to develop a synthesis method for very long metallic nanowires and apply them as new types of high performance flexible and transparent metal conductors as an alternative to carbon nanotubes, graphene and short nanowire based flexible transparent conductors and indium tin oxide based brittle transparent conductors. We found that very long metallic nanowire network conductors combined with a low temperature laser nano-welding process enabled superior transparent flexible conductors with high transmittance and high electrical conductivity. Further, we demonstrated highly flexible metal conductor LED circuits and transparent touch panels. The highly flexible and transparent metal conductors can be mounted on any non-planar surfaces and applied for various opto-electronics and ultimately for future wearable electronics.</P>
Lee, Jinhwan,Lee, Phillip,Lee, Ha Beom,Hong, Sukjoon,Lee, Inhwa,Yeo, Junyeob,Lee, Seung Seob,Kim, Taek‐,Soo,Lee, Dongjin,Ko, Seung Hwan WILEY‐VCH Verlag 2013 Advanced Functional Materials Vol.23 No.34
<P><B>Abstract</B></P><P>As an alternative to the brittle and expensive indium tin oxide (ITO) transparent conductor, a very simple, room‐temperature nanosoldering method of Ag nanowire percolation network is developed with conducting polymer to demonstrate highly flexible and even stretchable transparent conductors. The drying conducting polymer on Ag nanowire percolation network is used as a nanosoldering material inducing strong capillary‐force‐assisted stiction of the nanowires to other nanowires or to the substrate to enhance the electrical conductivity, mechanical stability, and adhesion to the substrate of the nanowire percolation network without the conventional high‐temperature annealing step. Highly bendable Ag nanowire/conducting polymer hybrid films with low sheet resistance and high transmittance are demonstrated on a plastic substrate. The fabricated flexible transparent electrode maintains its conductivity over 20 000 cyclic bends and 5 to 10% stretching. Finally, a large area (A4‐size) transparent conductor and a flexible touch panel on a non‐flat surface are fabricated to demonstrate the possibility of cost‐effective mass production as well as the applicability to the unconventional arbitrary soft surfaces. These results suggest that this is an important step toward producing intelligent and multifunctional soft electric devices as friendly human/electronics interface, and it may ultimately contribute to the applications in wearable computers.</P>
Lee, Phillip,Lee, Jinhwan,Lee, Hyungman,Yeo, Junyeob,Hong, Sukjoon,Nam, Koo Hyun,Lee, Dongjin,Lee, Seung Seob,Ko, Seung Hwan WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.25
<P><B>A highly stretchable metal electrode</B> is developed via the solution‐processing of very long (>100 μm) metallic nanowires and subsequent percolation network formation via low‐temperature nanowelding. The stretchable metal electrode from very long metal nanowires demonstrated high electrical conductivity (∼9 ohm sq<SUP>−1</SUP>) and mechanical compliance (strain > 460%) at the same time. This method is expected to overcome the performance limitation of the current stretchable electronics such as graphene, carbon nanotubes, and buckled nanoribbons.</P>
Structural and Optical Properties of Single- and Few-Layer Magnetic Semiconductor CrPS<sub>4</sub>
Lee, Jinhwan,Ko, Taeg Yeoung,Kim, Jung Hwa,Bark, Hunyoung,Kang, Byunggil,Jung, Soon-Gil,Park, Tuson,Lee, Zonghoon,Ryu, Sunmin,Lee, Changgu American Chemical Society 2017 ACS NANO Vol.11 No.11
<P>Atomically thin binary two-dimensional (2D) semiconductors exhibit diverse physical properties depending on their composition, structure, and thickness. By adding another element in these materials, which will lead to formation of ternary 2D materials, the property and structure would greatly change and significantly expanded applications could be explored. In this work, we report structural and optical properties of atomically thin chromium thiophosphate (CrPS<SUB>4</SUB>), a ternary antiferromagnetic semiconductor. Its structural details were revealed by X-ray and electron diffraction. Transmission electron microscopy showed that preferentially cleaved edges are parallel to diagonal Cr atom rows, which readily identified their crystallographic orientations. Strong in-plane optical anisotropy induced birefringence that also enabled efficient determination of crystallographic orientation using polarized microscopy. The lattice vibrations were probed by Raman spectroscopy and exhibited significant dependence on thickness of crystals exfoliated down to a single layer. Optical absorption determined by reflectance contrast was dominated by d–d-type transitions localized at Cr<SUP>3+</SUP> ions, which was also responsible for the major photoluminescence peak at 1.31 eV. The spectral features in the absorption and emission spectra exhibited noticeable thickness dependence and hinted at a high photochemical activity for single-layer CrPS<SUB>4</SUB>. The current structural and optical investigation will provide a firm basis for future study and application of this kind of atomically thin magnetic semiconductors.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-11/acsnano.7b04679/production/images/medium/nn-2017-04679m_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b04679'>ACS Electronic Supporting Info</A></P>
Lee, Youngbin,Lee, Jinhwan,Bark, Hunyoung,Oh, Il-Kwon,Ryu, Gyeong Hee,Lee, Zonghoon,Kim, Hyungjun,Cho, Jeong Ho,Ahn, Jong-Hyun,Lee, Changgu The Royal Society of Chemistry 2014 Nanoscale Vol.6 No.5
We describe a method for synthesizing large-area and uniform molybdenum disulfide films, with control over the layer number, on insulating substrates using a gas phase sulfuric precursor (H2S) and a molybdenum metal source. The metal layer thickness was varied to effectively control the number of layers (2 to 12) present in the synthesized film. The films were grown on wafer-scale Si/SiO2 or quartz substrates and displayed excellent uniformity and a high crystallinity over the entire area. Thin film transistors were prepared using these materials, and the performances of the devices were tested. The devices displayed an on/off current ratio of 10(5), a mobility of 0.12 cm(2) V (1) s (1) (mean mobility value of 0.07 cm(2) V-1 s(-1)), and reliable operation.
Effective Multiplexing Method for Conditional Access System in Terrestrial DMB
YongHoon Lee,Gwangsoon Lee,Jinhwan Lee,Soo In Lee,김남 한국전자통신연구원 2008 ETRI Journal Vol.30 No.6
This letter proposes a conditional access system (CAS) suitable for use in terrestrial digital multimedia broadcasting (T-DMB), based on an effective multiplexing method to provide encrypted T-DMB services. Specifically, the proposed multiplexing method for a CAS is designed to reduce the additional bit rate while assuring easy access to the designated encrypted services. Finally, the performance of the implemented CAS is confirmed through implementation and a broadcasting experiment under various service environments.
Low-Powered pH-Stable Nano-electrokinetically Enhanced Lateral Flow Assay for COVID-19 Antigen Test
Kim Kang Hyeon,유용경,Lee Na Eun,Lee Junwoo,Kim Cheonjung,Lee Seungmin,Kim Jinhwan,Park Seong Jun,Lee Dongtak,이상원,Kim Hyungseok,허돈,Yoon Dae Sung,Lee Jeong Hoon 한국바이오칩학회 2023 BioChip Journal Vol.17 No.3
Lateral fl ow assay (LFA) is a popular diagnostic system used in point-of-care testing (POCT) due to its low cost and portability. However, LFA has limited sensitivity and detection limits, making it challenging to detect low virus titers. Preconcentration through nano-electrokinetic (NEK) techniques have been proposed as a promising solution to improve the sensitivity of LFA. Nevertheless, the acidic conditions used in NEK operations may reduce the specifi city and sensitivity of LFA immunoassays. To address these limitations, an integrated LFA kit, the NEK-enhanced LFA (PcNEK–LFA), has been introduced. This kit features a pH-controlled structure designed to facilitate sample preconcentration. Biomarkers and AuNPs are electrokinetically preconcentrated in the PcNEK–LFA platform to increase the concentration of the test line and Ag–Ab binding events, resulting in enhanced performance. The pH-controlled PcNEK–LFA platform was evaluated using salivary human chorionic gonadotropin beta (β-hCG) and COVID-19 Ag samples, achieving a preconcentrating factor of approximately 10 and a sensitivity enhancement of 55.42%, and a preconcentrating factor greater than 10, respectively. The pH-controlled PcNEK–LFA platform provides an eff ective solution to overcome the limitations of LFA for POCT. In addition, it improves its sensitivity and detection limit, signifi cantly enhancing the accuracy and reliability of POCT, particularly for COVID-19 screening tests. As a result, this platform may play a pivotal role in addressing current and future healthcare challenges, facilitating rapid diagnosis and treatment of infectious diseases.
Lee, Youngbin,Kim, Hyunmin,Lee, Jinhwan,Yu, Seong Hun,Hwang, Euyheon,Lee, Changgu,Ahn, Jong-Hyun,Cho, Jeong Ho American Chemical Society 2016 Chemistry of materials Vol.28 No.1
<P>We studied the surface-enhanced Raman scattering of an organic fluoropore (Rhodamine 6G, R6G) monolayer adsorbed onto graphene and two-dimensional (2D) molybedenium disulfides (MoS2) phototransistors and compared the results with the Raman scattering of R6G on 2D tungsten diselenides system (WSe2). The Raman enhancement factor of the R6G film adsorbed onto WSe2 was comparable to the corresponding value on graphene at 1365 cm(-1) and was approximately twice this value at 615 cm(-1). The amplitude of the charge transfer was estimated in situ by measuring the photocurrent produced in a hybrid system consisting of physisorbed R6G layer and the 2D materials. We found that the enhanced Raman scattering of R6G adsorbed onto the 2D materials was closely correlated with the charge transfer between the adsorbed molecules and the 2D materials. We also revealed that the intensity of Raman scattering generally decreased as the layer number of the 2D materials increased. For the R6G on the MoS2 nanosheet, a single layer system provided a maximum Raman enhancement factor, and this value decreased pseudolinearly with the number of layers. By contrast, the Raman enhancement factor of the R6G on WSe2 was greatest for both the mono- and bilayers, and it decreased dramatically as the number of layers increased. We provide qualitative theoretical explanations for these trends based on the electric field enhancement for the multile Fresnel phases and energy band diagrams of both systems.</P>