A5082194177- ZnO doping and properties
- Advanced Sensor and Energy Harvesting Materials
- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Transition Metal Oxide Nanomaterials
- Plasma Applications and Diagnostics
- Plasma Diagnostics and Applications
- Copper-based nanomaterials and applications
- Advanced Thermoelectric Materials and Devices
- Ga2O3 and related materials
- Perovskite Materials and Applications
- Advancements in Semiconductor Devices and Circuit Design
- 3D Printing in Biomedical Research
- MXene and MAX Phase Materials
- Advanced Photocatalysis Techniques
- Analytical Chemistry and Sensors
- 2D Materials and Applications
- Advanced Memory and Neural Computing
- Advanced Chemical Sensor Technologies
- Tactile and Sensory Interactions
- GaN-based semiconductor devices and materials
Gachon University
2015-2024
Hyundai Heavy Industries (South Korea)
2021
Gyeonggi Research Institute
2015-2019
Kyung Hee University
2018
Government of the Republic of Korea
2015-2017
Seonam University
2014-2016
Yonsei University
2001-2014
Soonchunhyang University Hospital
2010-2011
Konkuk University
2006
A wearable thermoelectric generator, woven on a wristband, consisting of chemically exfoliated n- and p-type transition metal dichalcogenide nanosheets.
Piezoelectric nanomaterials that can generate reactive oxygen species (ROS) by piezoelectric polarization under an external mechanical force have emerged as effective platform for cancer therapy. In this study, 2D WS2 nanosheets are functionalized with mitochondria-targeting triphenylphosphonium (TPP) ultrasound (US)-triggered, mitochondria-targeted piezodynamic addition, a glycolysis inhibitor (FX11) inhibit cellular energy metabolism is loaded into TPP- and poly(ethylene glycol)...
Transfer characteristics of ZnO thin-film transistors (TFTs) based on doped with various alkali metals. A new doping method is demonstrated by employing metals to achieve high-performance and solution-processed TFTs a low processing temperature (∼300 °C), which applicable flexible plastic substrates.
A facile and quick approach to prepare self-assembled monolayers of water-dispersible particles on the water surface is presented. Particle suspensions in alcohols were dropped a reservoir form long-range ordered various particles, including spherical solid soft hydrogel metal nanoparticles, quantum dots, nanowires, single-wall carbon nanotubes (SWCNTs), nanoplates, nanosheets. systematic study was conducted variables affecting monolayer assembly: solubility parameter spreading solvents,...
A high-yield solution-processed ultrathin (<10 nm) trigonal tellurium (t-Te) nanowire (NW) is introduced as a new class of piezoelectric nanomaterial with six-fold higher constant compared to conventional ZnO NWs for high-volume power-density nanogenerator (NG). While determining the energy-harvesting principle in NG consisting t-Te NW, it theoretically and experimentally found that NW piezoelectrically activated only by creating strain its radial direction, along which has an asymmetric...
Vertically aligned ZnO nanowires were grown on c-plane sapphire substrate by metal organic chemical vapor deposition technique. The single crystalline and structurally uniform did not exhibit any noticeable defects. Pt/ZnO nanowire Schottky diodes fabricated using e-beam lithography then characterized measuring temperature-dependent I−V characteristics. diode exhibited a low barrier height of 0.42 V ideality factor 1.6 at room temperature. Temperature-dependent hydrogen-sensing measurements...
In spite of the recent successes in transistors and solar cells utilizing poly(3-hexylthiophene) (P3HT) nanofibrils, systematic analysis on growth kinetics has not been reported due to lack analytical tools. This study proposed a simple spectroscopic method obtain crystallinity P3HT solutions. On basis approach, we found that hysteresis upon temperature is function solubility parameter difference (Δδ) between solvents. When Δδ ≥ 0.7, cooling (−20 °C)-and-heating (25 °C) process allowed...
Abstract Skin-like field-effect transistors are key elements of bio-integrated devices for future user-interactive electronic-skin applications. Despite recent rapid developments in skin-like stretchable transistors, imparting self-healing ability while maintaining necessary electrical performance to these remains a challenge. Herein, we describe polymer transistor capable autonomous self-healing. The active material consists blend an electrically insulating supramolecular with either...
In this report, ZnO single nanowire (NW)-based devices were fabricated on the same by e-beam lithography so that both sides had Ohmic contact and one side Schottky contact. Information about mechanism for low-power UV detection these was unambiguously provided I-V measurements. Adsorption desorption of oxygen molecules at NW surface are responsible device with contacts sides. Barrier height modulations interface states side.
Despite recent remarkable advances in stretchable organic thin-film field-effect transistors (OTFTs), the development of metallization remains a challenge. Here, we report highly and robust on an elastomeric semiconductor film based metal-elastic intermixing. We found that vaporized silver (Ag) atom with higher diffusivity than other noble metals (Au Cu) forms continuous intermixing layer during thermal evaporation, enabling metallization. The Ag maintains high conductivity (>104 S/cm) even...
Nanophase mixtures, leveraging the complementary strengths of each component, are vital for composites to overcome limitations posed by single elemental materials. Among these, metal-elastomer nanophases particularly important, holding various practical applications stretchable electronics. However, methodology and understanding nanophase mixing metals elastomers limited due difficulties in blending caused thermodynamic incompatibility. Here, we present a controlled method using kinetics mix...
Generally, the parameter p · d (pressure × gap distance) in dielectric barrier discharge (DBD) controls electrical breakdown and also plasma characteristics. We investigated optimum transition by controlling pressure. To find (p dtr) condition, optical emission spectroscopy (OES) was used to measure spectra from DBD. All data were normalized second positive system of nitrogen molecules, wavelength which 337.1 nm. Then we compared relative intensities species generated during OES analysis....
This study explores low-temperature solution-process-based seed-layer-free ZnO p-n homojunction light-emitting diode (LED). In order to obtain p-type nanodisks (NDs), antimony (Sb) was doped into by using a facile chemical route at 120 °C. The X-ray photoelectron spectra indicated the presence of (SbZn-2VZn) acceptor complex in Sb-doped NDs. Using these NDs as freestanding templates, undoped n-type nanorods (NRs) were epitaxially grown 95 °C form homojunction. with turn-on voltage 2.5 V...
Abstract In a native muscle microenvironment, electrical and mechanical stimuli exist in the form of action potentials contraction. Here, cell culture system is developed that can mimic vivo microenvironment provide these to cultured cells, it tested whether stimulation promote myogenic differentiation human umbilical cord blood mesenchymal stem cells (hUCBMSCs). A thermosensitive, stretchable, piezoelectric substrate (TSPS) fabricated by polydimethylsiloxane spin‐coating aligned ZnO...
Abstract Stretchable wearable sensors ultimately require low power consumption and high response to physiological signals with skin conformability. However, power‐response tradeoff strain‐dependent sensing instability remain key challenges for electronic (e‐skin) sensors. Herein,an intrinsically stretchable organic subthreshold transistor operating at voltage (−1 V) is presented, leading ultralow (<1 nW) highly sensitive skin‐like temperature sensory devices. The temperature‐dependent...
To propel electronic skin (e-skin) to the next level by integrating artificial intelligence features with advanced sensory capabilities, it is imperative develop stretchable memory device technology. A for e-skin must offer, in particular, long-term data storage while ensuring security of personal information under any type deformation. However, despite significance these needs, technology related devices remains its infancy. Here, we report an intrinsically floating gate (FG) polymer...
In this study, we have analyzed the Au/ZnO single nanowire based Schottky diode by investigating temperature dependent current voltage and x-ray photoelectron spectroscopy (XPS) measurements. The calculated barrier height of diodes using thermionic emission model is in good agreement with value obtained from XPS measurements but lower than theoretically predicted value. ionization interface states has been considered for explaining discrepancy.
A desirable vertical phase separation of a bulk-heterojunction was achieved by inserting P3HT layer between the blend and poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) layer. According to high low (P3HT) surface energies substrate, it might be possible modulate in bulk-heterojunction. The result determined using time-of-flight secondary-ion mass spectroscopy analysis. controlled thickness 50 nm for inserted prevented undesirable light absorption power conversion...