27 results match your criteria: "Gumi Electronics and Information Technology Research Institute (GERI)[Affiliation]"
Talanta
November 2024
Digital Health Care Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, Gyeongbuk, 39253, Republic of Korea. Electronic address:
The fabrication of ordered nanoarray electrode (NAE) using UV imprinting and their application as electrochemical (EC) immunosensor is described in this study. Especially, the influence of the array density factors on the performance of NAE was characterized electrochemically and compared with flat-electrode. Low-density (hole: 200 nm, hole space = 600 nm), medium-density (hole: 200 nm, hole space = 400 nm), and high-density NAE (hole: 200 nm, hole space = 200 nm) which have the same active area were fabricated and their redox cycling was compared with empirical results.
View Article and Find Full Text PDFACS Appl Mater Interfaces
August 2024
Department of Energy Environment Policy and Technology, Graduate School of Energy and Environment (KU-KIST Green School), College of Engineering, Korea University, Seoul 02841, Republic of Korea.
Lead bromide-based perovskites are promising materials as the top cells of tandem solar cells and for application in various fields requiring high voltages owing to their wide band gaps and excellent environmental resistances. However, several factors, such as the formation of bulk and surface defects, impede the performances of corresponding devices, thereby limiting the efficiencies of these devices as single-junction devices. To reduce the number of defect sites, urea is added to the formamidinium lead bromide (FAPbBr) perovskite material to increase its grain size.
View Article and Find Full Text PDFACS Appl Mater Interfaces
June 2024
Digital Healthcare Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, Gyeongbuk 39253, Republic of Korea.
Polypyrrole (Ppy) is a biologically compatible polymer that is used as a matrix, in which drugs and enzymes can be incorporated by doping. Here, we suggest an inventive application of Ppy as a biorecognition film encapsulated with an antibody (Ab) as an alternative strategy for the on-site multistep functionalization of thiol-based self-assembled monolayers. The fabrication steps of the recognition films were followed by dropping pyrrole and Ab mixed solutions onto the electrode and obtaining a thin film by direct current electropolymerization.
View Article and Find Full Text PDFPLoS One
May 2024
Department of Dermatology, School of Medicine, University of Washington, Seattle, Washington, United States of America.
Sci Rep
March 2024
Department of Orthopedic Surgery, College of Medicine, Soonchunhyang University Gumi Hospital, Gumi, 39371, Republic of Korea.
The clavicle has various anatomic shapes unique to each individual. Additionally, with the increase in high-energy traumas such as sports injuries and traffic accidents, the patterns of fractures become complex and complicated. Thus, there is a need for a variety of shapes of locking compression plates (LCP) to accommodate different types of fractures and facilitate quicker rehabilitation.
View Article and Find Full Text PDFNanotechnology
February 2024
Department of Mechanical Engineering and KI for the NanoCentury (KINC), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
Zinc oxide (ZnO) nanowires fabricated via wet chemical synthesis on flexible polymer substrates are inherently unstable against mechanical bending stress because of their high density and weak adhesion to the substrate. We introduce a novel method for controlling the density of such ZnO nanowire arrays using a three-dimensional corrugated metal substrate. These metal substrates, featuring extruded and recessed patterns fabricated via nanoimprint lithography, were employed as cathodes during the electrochemical deposition of ZnO nanowire arrays.
View Article and Find Full Text PDFACS Appl Mater Interfaces
November 2023
Department of Energy Environment Policy and Technology, Graduate School of Energy and Environment (KU-KIST Green School), College of Engineering, Korea University, Seoul 02841, Republic of Korea.
The cesium lead iodide (CsPbI) perovskite solar cell possesses a wide band gap ranging from 1.65 to 1.75 eV, which is suitable for integration into a tandem structure along with a low-band-gap silicon solar cell.
View Article and Find Full Text PDFAdv Healthc Mater
January 2024
Department of Biomedical Engineering, Center for Microphysiological Systems, Johns Hopkins University, Baltimore, MD, 21205, USA.
A nanopatterned interdigitated electrode array (nanoIEA)-based impedance assay is developed for quantitative real-time measurement of aligned endothelial cell (EC) barrier functions in vitro. A bioinspired poly(3,4-dihydroxy-L-phenylalanine) (poly (l-DOPA)) coating is applied to improve the human brain EC adhesion onto the Nafion nanopatterned surfaces. It is found that a poly (l-DOPA)-coated Nafion grooved nanopattern makes the human brain ECs orient along the nanopattern direction.
View Article and Find Full Text PDFAdv Mater
October 2023
Department of Optics and Mechatronics Engineering, Department of Cogno-Mechatronics Engineering, Pusan National University, Busan, 46241, Republic of Korea.
Copper surfaces that exhibit a wide range of achromatic colors while still metallic have not been studied, despite advancements in antireflection coatings. A series of achromatic copper films grown with [111] preferred orientation by depositing 3D porous nanostructures is introduced via coherent/incoherent atomic sputtering epitaxy. The porous copper nanostructures self-regulate the giant oxidation resistance by constructing a curved surface that generates a series of monoatomic steps, followed by shrinkage of the lattice spacing of one or two surface layers.
View Article and Find Full Text PDFNanomaterials (Basel)
July 2023
Department of Materials Science and Engineering, Kumoh National Institute of Technology, Gumi 39177, Republic of Korea.
We used capacitance-voltage (-), conductance-voltage (-), and noise measurements to examine the carrier trap mechanisms at the surface/core of an AlGaN/GaN nanowire wrap-gate transistor (WGT). When the frequency is increased, the predicted surface trap density promptly drops, with values ranging from 9.1 × 10 eV∙cm at 1 kHz to 1.
View Article and Find Full Text PDFLab Chip
August 2023
Division of Dermatology, Department of Medicine, University of Washington, 850 Republican Street, Seattle, WA 98109, USA.
Surgery, radiation, hormonal therapy, chemotherapy, and immunotherapy are standard treatment strategies for metastatic breast cancer. However, the heterogeneous nature of the disease poses challenges and continues to make it life-threatening. It is crucial to elucidate further the underlying signaling pathways to improve treatment efficacy.
View Article and Find Full Text PDFACS Omega
January 2023
Department of Medical IT Convergence, Kumoh National Institute of Technology, Gumi, Gyeongbuk39177, Korea.
Gold is of considerable interest for electrochemical active surfaces because thiol-modified chemicals and biomolecules can be easily immobilized with a simple procedure. However, most gold surfaces are damaged with repetitive measurements, so they are difficult to reuse. Here we demonstrate a novel electrochemical cleaning method of gold surfaces to reuse electrodes with a simple protocol that is easy and nontoxic.
View Article and Find Full Text PDFSci Rep
December 2022
Department of Medical IT Convergence, Kumoh National Institute of Technology, Gumi, Gyeongbuk, 39177, Republic of Korea.
Sci Rep
October 2022
Department of Medical IT Convergence, Kumoh National Institute of Technology, Gumi, Gyeongbuk, 39177, Republic of Korea.
Monitoring nicotinamide adenine dinucleotide (NADH) is important because NADH is involved in cellular redox reactions and cellular energy production. Currently, few biosensors quantify NADH in whole blood. However, they still have limitations due to several defects, including poor repeatability, long analysis time, and their requirement of extra sample pretreatment.
View Article and Find Full Text PDFSTAR Protoc
March 2022
Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia.
Thin semiconductors attract huge interest due to their cost-effective, flexible, lightweight, and semi-transparent properties. Here, we present a protocol on the preparation of thin semiconductor via controlled crack-assisted layer exfoliation technique. The protocol details the fabrication procedure for producing thin monocrystalline semiconductors with thicknesses in the range of a few tens of micrometers from thick donor substrates.
View Article and Find Full Text PDFBiosensors (Basel)
February 2022
Department of Medical IT Convergence, Kumoh National Institute of Technology, Gumi 39177, Korea.
Nicotinamide adenine dinucleotide (NADH) is an important cofactor involved in metabolic redox reactions in living cells. The detection of NADH in living animal cells is a challenge. We developed a one-step monitoring method for NADH via an electrocatalytic reaction that uses a surface-modified, screen-printed electrode (SPE) having a redox active monolayer 4'-mercapto-N-phenlyquinone diamine (NPQD) formed by a self-assembled monolayer (SAM) of an aromatic thiol, 4-aminothiophenol (4-ATP).
View Article and Find Full Text PDFNanomaterials (Basel)
November 2021
Advanced Mechatronics R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Korea.
A cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dot (QD)-based multi-level memory device with the structure [ITO/PEDOT:PSS/QDs/ZnO/Al:AlO/QDs/Al] was fabricated via a spin-coating method used to deposit thin films. Two layers of QD thin films present in the device act as charge storage layers to form three distinct states. Zinc oxide (ZnO) and aluminum oxide (AlO) were added to prevent leakage.
View Article and Find Full Text PDFMicrosyst Nanoeng
November 2020
Digital Healthcare Research Center, Gumi Electronics and Information Technology Research Institute (GERI), 350-27, Gumidaero, Gumi, Gyeongbuk, 39253 South Korea.
Adv Mater
October 2021
Department of Physics, Chungbuk National University, Cheongju, 28644, South Korea.
The fabrication of ultrathin silicon wafers at low cost is crucial for advancing silicon electronics toward stretchability and flexibility. However, conventional fabrication techniques are inefficient because they sacrifice a large amount of substrate material. Thus, advanced silicon electronics that have been realized in laboratories cannot move forward to commercialization.
View Article and Find Full Text PDFiScience
August 2021
Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia.
Silicon (Si) has been widely investigated as a feasible material for photoelectrochemical (PEC) water splitting. Compared to thick wafer-based Si, thin Si (<50 μm thickness) could concurrently minimize the material usage allowing the development of cost-effective and flexible photoelectrodes for integrable PEC cells. This work presents the design and fabrication of thin Si using crack-assisted layer exfoliation method through detailed optical simulations and a systematic investigation of the exfoliation method.
View Article and Find Full Text PDFAdv Mater Interfaces
April 2021
Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States; Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, United States; Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, United States.
In this paper, we report a simple and facile method to fabricate nanomolded Nafion thin films with tunable mechanical, and electrical properties. To achieve this, we combine a novel thermal evaporation-induced capillary force lithography method with swelling process to obtain enhanced pattern fidelity in nanomolded Nafion films. We demonstrate that structural fidelity and mechanical properties of patterned Nafion thin films can be modulated by changing fabrication parameters such as swelling time, Nafion polymer concentration, and curing temperature.
View Article and Find Full Text PDFAdv Funct Mater
June 2020
Department of Biomedical Engineering and Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, United States.
In this study, we report nanopatterned Nafion microelectrode arrays for in vitro cardiac electrophysiology. With the aim of defining sophisticated Nafion nanostructures with highly ionic conductivity, fabrication parameters such as Nafion concentration and curing temperature were optimized. By increasing curing temperature and Nafion concentration, we were able to control the replication fidelity of Nafion nanopatterns when copied from a PDMS master mold.
View Article and Find Full Text PDFNano Converg
August 2020
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea.
InGaAs-based photodetectors have been generally used for detection in the short-wave infrared (SWIR) region. However, the epitaxial process used to grow these materials is expensive; therefore, InGaAs-based photodetectors are limited to space exploration and military applications. Many researchers have expended considerable efforts to address the problem of SWIR photodetector development using lead sulfide (PbS) quantum dots (QDs).
View Article and Find Full Text PDFJ Nanosci Nanotechnol
September 2018
Department of Electrical Engineering, Hanbat National University, Daejeon 34158, Republic of Korea.
In this study, a mass sensor was fabricated using a carbon nanowalls, and its performance was analyzed. The substrate that was used to fabricate the mass sensor was a polyimide film, on which a SiO2 insulating layer and a copper electrode were deposited using an RF magnetron sputter. Thereafter, a carbon nanowalls was grown on the substrate until its size was 5 by 5 mm.
View Article and Find Full Text PDFJ Nanosci Nanotechnol
September 2018
Department of Electrical Engineering, Hanbat National University, Daejeon 34158, Republic of Korea.
In this study, the structural and electrical characteristics of carbon nanowalls (CNWs) synthesized on polyimide films were investigated. CNWs were synthesized on polyimide films as various growth times. The cross-section and surface of the CNWs synthesized were examined using FE-SEM.
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