27 results match your criteria: "Gumi Electronics and Information Technology Research Institute (GERI)[Affiliation]"

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 PDF

Improving FAPbBr Perovskite Crystal Quality via Additive Engineering for High Voltage Solar Cell over 1.5 V.

ACS 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 PDF

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 PDF

Exploring novel immunotherapy biomarker candidates induced by cancer deformation.

PLoS One

May 2024

Department of Dermatology, School of Medicine, University of Washington, Seattle, Washington, United States of America.

Article Synopsis
  • Triple-negative breast cancer (TNBC) is aggressive and has limited treatment options, prompting the need for new strategies like immunotherapy.
  • This research focuses on identifying new biomarkers linked to TNBC that could improve immunotherapy, particularly those affecting the PD-1/PD-L1 pathway.
  • The study identified 13 Ig genes with altered expression in a metastatic TNBC environment, proposing these as potential biomarkers for future targeted treatments.
View Article and Find Full Text PDF

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 PDF

Density-controlled electrochemical synthesis of ZnO nanowire arrays using nanotextured cathode.

Nanotechnology

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 PDF

Phase Stability Improvement of a γ-CsPbI Perovskite Solar Cell Utilizing a Barium Bis(trifluoromethanesulfonimide) Solution.

ACS 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 PDF

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 PDF

Self-Oxidation Resistance of the Curved Surface of Achromatic Copper.

Adv 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 PDF

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 PDF

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 PDF

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 PDF

Disposable electrocatalytic sensor for whole blood NADH monitoring.

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 PDF

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 PDF

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 PDF

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 PDF
Article Synopsis
  • The study presents a method for precisely arranging Au/DNA hybrid nanocircuits using a combination of electron-beam lithography (EBL), plasma ashing, and molecular patterning.
  • The process allows for uniform nanostructures with sub-10 nm patterning over a large 12.6-inch substrate and involves immobilizing DNA on specific areas.
  • The resulting Au/DNA hybrid nanowires show promising electrical conductivity, indicating their potential use in advanced nanostructure applications, like creating smaller DNA wires and enhanced metal/DNA circuits.
View Article and Find Full Text PDF

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 PDF

Thin silicon via crack-assisted layer exfoliation for photoelectrochemical water splitting.

iScience

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 PDF

Fabrication of nanomolded Nafion thin films with tunable mechanical and electrical properties using thermal evaporation-induced capillary force lithography.

Adv 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 PDF

Nanopatterned Nafion microelectrode arrays for cardiac electrophysiology.

Adv 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 PDF

Air-stable and ultrasensitive solution-cast SWIR photodetectors utilizing modified core/shell colloidal quantum dots.

Nano 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 PDF

Development and Performance Analysis of Carbon Nanowall-Based Mass Sensor.

J 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 PDF

Structural and Electrical Characteristics of Carbon Nanowalls Synthesized on the Polyimide Film.

J 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.

View Article and Find Full Text PDF