A5069899150- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Nanowire Synthesis and Applications
- Nanomaterials and Printing Technologies
- Solid-state spectroscopy and crystallography
- Luminescence Properties of Advanced Materials
- Organic Light-Emitting Diodes Research
- Tactile and Sensory Interactions
- Copper-based nanomaterials and applications
- Advanced Memory and Neural Computing
- Nuclear and radioactivity studies
- Microwave and Dielectric Measurement Techniques
- Microwave Engineering and Waveguides
- Nonlinear Partial Differential Equations
- Graphite, nuclear technology, radiation studies
- Gold and Silver Nanoparticles Synthesis and Applications
- Erosion and Abrasive Machining
- Electrical and Thermal Properties of Materials
- Electrophoretic Deposition in Materials Science
- Coastal and Marine Dynamics
Korea University
2008-2024
Korea Institute of Civil Engineering and Building Technology
2024
Sangmyung University
2023
Pohang University of Science and Technology
2019-2022
Government of the Republic of Korea
2019-2020
Tanana Chiefs Conference
2020
Seoul Institute
2019
Catholic Kwandong University
2019
John Wiley & Sons (United States)
2015-2016
Hudson Institute
2016
Abstract Highly sensitive temperature sensors are designed by exploiting the interparticle distance–dependent transport mechanism in nanocrystal (NC) thin films based on a thermal expansion strategy. The effect of ligands electronic, thermal, mechanical, and charge properties silver (Ag) NC expandable substrates poly(dimethylsiloxane) (PDMS) is investigated. While inorganic ligand‐treated Ag exhibit low coefficient resistance (TCR), organic extremely high TCR up to 0.5 K −1 , which highest...
In the melt state at equilibrium, entangled nonconcatenated ring macromolecules adapt more compact conformations compared to their linear analogs and do not form an entanglement network. We show here that, when subjected uniaxial stretching, they exhibit a unique response, which sets them apart from any other polymer. Remarkably, whereas both polymers strain-harden, viscosity of rings increases dramatically (the thickens) very low stretch rates due unraveling along stretching direction. At...
Abstract Perovskite has been actively studied for optoelectronic applications, such as photodetectors and light‐emitting diodes (LEDs), because of its excellent properties. However, ionic bonds the perovskite structure are vulnerable to chemicals, which makes incompatible with photolithography processes that use polar solvents. Such incompatibility hinders patterning device integration. Here, an all‐solution based cesium lead halide (Cs x Pb y Br z ) method is introduced in PbBr 2 patterned...
Human voice recognition via skin-attachable devices has significant potential for gathering important physiological information from acoustic data without background noise interference. In this study, a highly sensitive and conductive wearable crack-based strain sensor was developed voice-recognition systems. The fabricated using double-layer structure of Ag nanoparticles (NPs) metal on biocompatible polydimethylsiloxane substrate. top layer acts as conducting active layer, whereas the...
In this study, non-temperature interference strain gauge sensors, which are only sensitive to but not temperature, developed by engineering the properties and structure from a material perspective. The environmental temperature fluctuations is successfully eliminated controlling charge transport in nanoparticles with thermally expandable polymer substrates. Notably, negative coefficient of resistance (TCR), originates hopping nanoparticle arrays, compensated positive TCR effective surface...
Amorphous metal oxide semiconductor phototransistors (MOTPs) integrated with colloidal quantum dots (QDs) (QD-MOTPs) are promising infrared photodetectors owing to their high photoconductive gain, low off-current level, and compatibility pixel circuits. However, date, the poor mobility of conventional MOTPs, such as indium gallium zinc (IGZO), toxicity lead (Pb)-based QDs, sulfide selenide, has limited commercial applications QD-MOTPs. Herein, an ultrasensitive QD-MOTP fabricated by...
Next-generation devices and systems require the development integration of advanced materials, realization which inevitably requires two separate processes: property engineering patterning. Here, we report a one-step, ink-lithography technique to pattern engineer properties thin films colloidal nanocrystals that exploits their chemically addressable surface. Colloidal are deposited by solution-based methods form local chemical treatment is applied using an ink-printing simultaneously modify...
Anti-interference characteristics, whereby undesirable signal interference is minimized, are required for multifunctional sensor platforms. In this study, an anti-temperature-interference resistive-type strain sensor, which does not respond to temperature but only strain, designed. properties were achieved by modulating the coefficient of resistance (TCR) metal nanoparticles (NPs) through hybrid chemical treatment with organic and halide ligands that induce negative positive TCRs,...
Stretchable electrodes are widely used in next-generation wearable electronics. Recent studies incorporated designs that help rigid attain stretchability. However, these structures exhibited unsatisfactory charge/signal extraction efficiency because of their low areal fill factor. Additionally, they cannot be photolithographically patterned on polymer substrates adhesion, requiring additional complicated fabrication steps. We developed patternable stretchable with complete coverage and...
Abstract Self‐classification technology has remarkable potential for autonomously discerning various stimuli without any circuit or software assistance, enabling it to realize electronic skin. In conventional self‐classification systems that rely on complex circuitry operation, integrating the sensing and algorithm processing units inevitably leads bulkiness in devices bottlenecks signal processing. this study, novel double‐sided structure inspired by human nervous system is newly designed a...
<title>Abstract</title> ZnMgO nanoparticles (ZMO NPs) are widely used as electron transport layers in optoelectronic devices such light-emitting diodes (LEDs) and photodiodes (PDs) owing to their facile synthesis excellent properties. However, the surface hydroxyl groups (‒OH) on ZMO NPs introduce charge traps, inhibit transport, reduce device stability, particularly under ambient humidity oxygen. An alcohol treatment (AT) method was developed this study remove ‒OH via proton transfer,...
A physically unclonable function (PUF) is a promising hardware-based cryptographic primitive to prevent confidential information leakage. However, conventional techniques, such as weak and strong PUFs, have limitations in overcoming the trade-off between security storage volume. This study introduces nanoseed-based PUFs that overcome drawbacks of using optical electrical randomness originated from nanoseeds unique on-demand algorithm. Ideally mixed PbS quantum dots Ag nanocrystals same...
We report a simple, solution-based, and postsynthetic process for simultaneous ligand exchange, surface passivation, doping of CdSe nanocrystals (NCs) the design high-performance field-effect transistors (FETs). Strong electronic coupling, effective trap n-type NCs could be achieved by simply immersing as-synthesized NC thin films into InX3 (X = Cl, Br, I) solution. The optical, chemical, structural properties these were analyzed, revealing successful exchange In doping. It is demonstrated...
The popularity of colloidal quantum dot (CQD) solar cells has increased owing to their tunable bandgap, multiple exciton generation, and low-cost solution processes. ZnO nanoparticle (NP) layers are generally employed as electron transport in CQD efficiently extract the electrons. However, trap sites unfavorable band structure as-synthesized NPs have hindered potential performance. Herein, we introduce a facile method NP annealing state. Electrical, structural, optical analyses demonstrated...
Abstract In the present study, a new patterning method is introduced through surface modification and stabilization of perovskite nanocrystals, which compatible with conventional photolithography process based on all‐solution processes. Chemically designed gel‐type silica‐coated CsPbX 3 (X = Br, I, etc.) nanocrystals combined dip coating are to form stable uniform films. Analyses physical chemical states investigation kinetics in silica formation conducted. an optimized condition, physically...
Post-synthesis engineering methods that employ oriented attachment to precisely control the size and dimensionality (0D/1D/2D) of as-synthesized CsPbBr3 nanocrystals (NCs) are demonstrated. We investigated chemical effects properties polar solvents, including their immiscibility, polarity, boiling point, on surfaces NCs, as well effect structural optical NCs. Appropriate exploitation solvent made it possible use a mildly affect NCs indirectly such they discarded ligands became attached...
Abstract In this study, a novel synthesis of ultrathin, highly uniform colloidal bismuth sulfohalide (BiSX where X = Cl, Br, I) nanowires (NWs) and NW bundles (NBs) for room‐temperature solution‐processed flexible photodetectors are presented. High‐aspect‐ratio sulfobromide (BiSBr) NWs synthesized via heat‐up method using bromide elemental S as precursors 1‐dodecanethiol solvent. Bundling the BiSBr occurs upon addition 1‐octadecene co‐solvent. The morphologies NBs easily tailored from...
We investigated the chemical effects of halide ligands on electromechanical properties Ag nanocrystal (NC) thin films for potential uses in wearable devices and sensors. The treatments induced changes sizes sintered NCs, interparticle distances, microscale surface morphologies. Various characterization techniques models were used to study origin nanoscale structures, their chemistries, electronic NC films. results indicated that led gauge factor, which varied from 5 600. On basis these...
In this study, a self-sorting sensor was developed with the ability to distinguish between different pressure regimes and translate electrical signals. Specifically, can soft hard like human skin, without any software assistance complicated circuits. To achieve property, Janus-like jagged structures were prepared via an all-solution process of spontaneous chemical patterning; they comprised electrically semi-insulating vertices highly conductive valleys. This unique structure facilitates...
An ideal open meshed structure for a highly sensitive and transparent pressure sensor is simply fabricated by one-step chemical treatment.