- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Thermal Radiation and Cooling Technologies
- Optical Coatings and Gratings
- Graphene research and applications
- Silicon and Solar Cell Technologies
- Semiconductor materials and devices
- Photonic and Optical Devices
- Silicon Nanostructures and Photoluminescence
- Advancements in Semiconductor Devices and Circuit Design
- Gold and Silver Nanoparticles Synthesis and Applications
- Fuel Cells and Related Materials
- ZnO doping and properties
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Membrane-based Ion Separation Techniques
- 2D Materials and Applications
- Photoreceptor and optogenetics research
- Nanopore and Nanochannel Transport Studies
- Neuroscience and Neural Engineering
- Force Microscopy Techniques and Applications
- Analytical Chemistry and Sensors
- Organic Light-Emitting Diodes Research
National NanoFab Center
2015-2024
Korea Advanced Institute of Science and Technology
2015-2024
Gwangju Institute of Science and Technology
2023
Pusan National University
2023
Korea Electronics Technology Institute
2023
Daejeon University
2020
Seoul National University
2006-2010
Layered structures of transition metal dichalcogenides stacked by van der Waals interactions are now attracting the attention many researchers because they have fascinating electronic, optical, thermoelectric, and catalytic properties emerging at monolayer limit. However, commonly used methods for preparing monolayers limitations low yield poor extendibility into large-area applications. Herein, we demonstrate synthesis MoSe2 with high quality uniformity selenization MoO3 via chemical vapor...
Abstract Inorganic‐based micro light‐emitting diodes (µLEDs) have witnessed significant improvements in terms of display and biomedical applications, which can shift the paradigm future optoelectronic systems. In particular, µLED displays are on verge becoming next big interface platform for visual communications, expanding to various internet things wearable/bioapplications. Novel concepts need be upgraded able satisfy their potential optoelectric such as virtual reality, smart watches,...
Flexible piezoelectric energy harvesters have been regarded as an overarching candidate for achieving self-powered electronic systems environmental sensors and biomedical devices using the self-sufficient electrical energy. In this research, we realize a flexible high-output lead-free harvester by aerosol deposition method laser lift-off process. We also investigated comprehensive biocompatibility of piezoceramic device ex-vivo ionic elusion in vivo bioimplantation, well vitro cell...
Abstract Emerging classes of flexible electronic systems that can be attached to a wide range surfaces from wearable clothes internal organs have driven significant advances in communication protocols (e.g., Internet Things, augmented reality) and clinical research, shifting today's personal computing paradigm. The field “system on plastic” is the verge an innovative breakthrough toward hypercognitive society by being fused with current neuromorphic applications spotlight, which offer...
Abstract Layered molybdenum disulphide was grown at a low-temperature of 350 °C using chemical vapour deposition by elaborately controlling the cluster size. The under various sulphur-reaction-gas to molybdenum-precursor partial-pressure ratios were examined. Using spectroscopy and microscopy, effect size on layered growth investigated in terms morphology, grain size, impurity incorporation. Triangular single-crystal domains an optimized ratio. Furthermore, it is proved that nucleation sites...
Underactive bladder or detrusor underactivity (DUA), that is, not being able to micturate, has received less attention with little research and remains unknown limited on pathological causes treatments as opposed overactive bladder, although the syndrome may pose a risk of urinary infections life-threatening kidney damage. Here, we present an integrated expandable electronic optoelectronic complex behaves single body elastic, time-dynamic substantial volume changes up ~300%. The system...
Abstract Inorganic phase change memories (PCMs) have attracted substantial attention as a next‐generation storage node, due to their high‐level of performance, reliability, and scalability. To integrate the PCM on plastic substrates, reset power should be minimized avoid thermal degradation polymers adjacent cells. Additionally, flexible random access memory remains unsolved absence optimal transfer method selection device. Here, an Mo‐based interfacial physical lift‐off is introduced...
Graphene with an atomically thin structure is considered to be a highly sensitive transducer capable of converting diverse external stimuli into measurable electrical signals. The generated signals, such as current and resistance, can extracted through contact graphene. Conventional methods for formation are usually based on physical deposition conductive materials the target Here, we propose method in situ chemical synthesis contacts graphene alternative approach that complements...
We report a development of reduced graphene oxide (rGO)-based gas sensors with practical recovery by facile functionalization tin dioxide nanoclusters. Upon the introduction UV illumination to this nanostructure, reaction on surfaces nanoclusters was activated and thereby nanoscale heterojunction barriers between rGO sheet were developed. This lowered conductance quickly recover, which intensified as cluster density has reached percolation threshold. However, after formation percolating...
Biological ion channels exhibiting selective and rectified transport properties feature nanoscale asymmetries in their physical structure, chemical composition, charge distribution. Inspired by this, a multi-asymmetric ion-diode membrane (IDM) having heterojunction between positively charged anodic aluminum oxide with conical macropores negatively Nafion very narrow mesopores was designed practically fabricated this study. Experiments theoretical calculations demonstrated that the proposed...
Abstract A robust Cu conductor on a glass substrate for thin‐film μLEDs using the flash‐induced chemical/physical interlocking between and is reported. During millisecond light irradiation, CuO nanoparticles (NPs) display are transformed into conductive film by reduction sintering. At same time, intensive heating at boundary of NPs chemically induces formation an ultrathin 2 O interlayer within Cu/glass interface strong adhesion. nanointerlocking occurs transient softening fluctuation to...
Abstract The engineering of structural colors is currently a promising, rapidly emerging research field because outstanding spatial resolution and durability can be generated using sustainable production method. However, the restricted saturated color range in micro/nano-fabricated ‘pigments’ has hindered dissemination printing. Here, this article presents spectral mixing filter (SMCF), which concept fine-tunable systems, capable addressing current issues engineering, by stacking vertical...
Abstract Nano-structural optical filters embedded in elastomers having high mechanical tunability provide the geometric degree of freedom for selective light manipulation. The active control spectral information typical structural is highly limited due to substrate rigidity. Herein, we present mechanochromic transmissive by employing flexible and stretchable polymer-embedded silicon nanostructures. Si-based nanowire arrays (Si-NWAs) have been introduced exhibit parametric resonance...
Passive radiative cooling has been spotlighted as a promising energy-saving technology owing to its energy-free and zero-carbon emission for addressing global energy climate crises. Although can significantly save in hot weather, it inevitably accompanies undesirable cold weather resulting from single-state of strong thermal emission. Dual-state emitters have recently developed self-adaptive thermoregulation, but they still exhibit loss moderate weather. Herein, we report “continuous”...
Developing a well-defined nanostructure that can provide strong, reproducible, and stable SERS signals is quite important for the practical application of surface-enhanced Raman scattering (SERS) sensors. We report here novel single nanowire (NW) on graphene (SNOG) structure as an efficient, SERS-active platform. Au NWs having single-crystal geometry monolayer graphene-coated metal film form well-defined, continuous nanogap provides extremely reproducible signals. The in-NW reproducibility...
The fabrication of super-antireflective structure films is reported, which exhibit an unprecedented refractive index profile and eliminate reflections almost completely for any angle incidence with extreme precision using a newly developed square voltage pulse anodization. application the on polymer solar cells demonstrates that efficiencies film increase to 12.08% at 70°. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are...
Passive radiative cooling has been spotlighted as a method to solve environmental problems and fuel depletion. Therefore, various coolers have studied applied lower the surface temperatures of objects such roof, building exterior, solar cells, automobiles without any external energy. Furthermore, recently, research scope is expanded enclosed spaces, which not limited object cooling. Especially, Janus emitter (JET) selective broadband emission on separated sides, helps drawing heat from...
Abstract The latest progresses in software engineering such as cloud computing, big data analysis, and machine learning have accelerated the emergence of advanced intelligent systems (AIS). However, current computing system has significant challenges dealing with unstructured (e.g., image, voice, physiological signals) because von‐Neumann bottleneck induces latency power consumption issues. Neuromorphic which imitates behaviors neuron synapse within biological neural network, is considered a...
For the integration of a reactive multilayer system (iRMS) with high exothermic reaction enthalpy as heat source on silicon wafers for low-temperature bonding in 3D and packaging microsystems, two main conflicting issues should be overcome: accumulation arising from layer interface pre-intermixing, which causes spontaneous self-ignition during deposition layers, conductive loss through substrate, leads to propagation quenching. In this work, using electron beam evaporation, we investigated...
Exploring the utilization of ion exchange membranes (IEMs) in salinity gradient energy harvesting, a technique that capitalizes on difference between seawater and freshwater to generate electricity, this study focuses optimizing PVDF Nafion ratios create ultra-thin membranes. Specifically, our investigation aligns with applications such as reverse electrodialysis (RED), where IEMs facilitate selective transport across gradients. We demonstrate reduced content, particularly 50:50 PVDF:Nafion...
Numerous studies have focused on graphene owing to its potential as a next-generation electronic material, considering high conductivity, transparency, superior mechanical stiffness, and flexibility. However, cost-effective mass production of graphene-based electronics based existing fabrication methods, such transfer metal formation, remains challenge. This study proposes simple efficient method for creating electrical contacts with graphene. The involves patterning Cu foil after growth,...
Transparent nanofloating gate memory devices based on top-gate zinc oxide thin-film transistors were developed. The proposed contained a facile and dry-synthesized palladium nanocluster array as charge-trapping layer. good programmable characteristics exhibited due to the thin tunneling oxide, caused by structure. endurance, data retention capability, environmental stability demonstrated device made it suitable for nonvolatile applications. As whole processes carried at room temperature,...