A5019838932- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Innovative Energy Harvesting Technologies
- Anodic Oxide Films and Nanostructures
- Gold and Silver Nanoparticles Synthesis and Applications
- Tactile and Sensory Interactions
- Plasmonic and Surface Plasmon Research
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Semiconductor materials and devices
- ZnO doping and properties
- Dielectric materials and actuators
- Surface Modification and Superhydrophobicity
- Thin-Film Transistor Technologies
- Graphene research and applications
- Nanowire Synthesis and Applications
- Force Microscopy Techniques and Applications
- Green IT and Sustainability
- Transition Metal Oxide Nanomaterials
- Muscle activation and electromyography studies
- Optical Coatings and Gratings
- Molecular Junctions and Nanostructures
- Smart Materials for Construction
- Energy Harvesting in Wireless Networks
Sungkyunkwan University
2009-2024
Kyung Hee University
2012-2021
Government of the Republic of Korea
2016-2021
Yong In University
2016-2021
Hanyang University
2020
Korea Railroad Research Institute
2019
Myongji University
2019
Dongguk University
2018-2019
Korea University
2019
Pohang University of Science and Technology
2004-2018
Transparent flexible charge-generating piezoelectric nanodevices are developed. The resulting integrated nanodevice generates a noticeable current when it is pushed by application of an external load. Piezoelectric ZnO nanorod-based with embossed PdAu top electrodes produce the highest output density approximately 10 μA cm−2 at load 0.9 kgf.
Abstract For existing triboelectric nanogenerators (TENGs), it is important to explore unique methods further enhance the output power under realistic environments speed up their commercialization. We report here a practical TENG composed of three layers, in which key layer, an electric double inserted between top made Al/polydimethylsiloxane, and bottom Al. The efficient charge separation middle based on Volta’s electrophorus, results from sequential contact configuration direct electrical...
Fully rollable transparent nanogenerators have been developed using chemical vapor deposition-grown large-scale graphene sheets as electrodes and piezoelectric ZnO-nanorod arrays. The electrical structural stability of the with excellent charge scavenging performance under external mechanical loads such bending rolling shows that graphene-based are suitable for self-powered device applications. Detailed facts importance to specialist readers published "Supporting Information". Such documents...
Human-machine interfaces have benefited from the advent of wireless sensor networks and internet things, but rely on wearable/attachable electronics exhibiting stretchability, biocompatibility, transmittance. Limited by weight volume, wearable devices should be energy efficient even self-powered. Here, we report practical approaches for obtaining a stably self-cleanable, transparent attachable ionic communicator based triboelectric nanogenerators. The can easily applied human skin due to...
Abstract Enhanced performance of an inverted‐type polymer solar cell is reported by controlling the surface energy a zinc oxide (ZnO) buffer layer, on which photoactive layer composed polymer:fullerene‐derivative bulk heterojunction formed. With approach based mixed self‐assembled monolayer, ZnO can be controlled between 40 mN m −1 and 70 with negligible changes in its work function. For given range power conversion efficiency increases from 3.27% to 3.70% through enhanced photocurrents. The...
It is essential to control the electronic structure of graphene in order apply films for use electrodes. We have introduced chemical dopants that modulate properties few-layer synthesized by vapor deposition. The work function, sheet carrier density, mobility, and resistance these were systematically modulated reduction potential values dopants. further demonstrated power generation a nanogenerator was strongly influenced choice electrode with modified function. off-current well quenched...
An artificial ionic mechanotransducer skin with an unprecedented sensitivity over a wide spectrum of pressure by fabricating visco-poroelastic nanochannels and microstructured features, directly mimicking the physiological tactile sensing mechanism Piezo2 protein is demonstrated. This capability enables voice identification, health monitoring, daily measurements, even measurements heavy weight beyond capabilities human skin. As service to our authors readers, this journal provides supporting...
Enhancing the output power of a nanogenerator is essential in applications as sustainable source for wireless sensors and microelectronics. We report here novel approach that greatly enhances piezoelectric generation by introducing p-type polymer layer on semiconducting thin film. Holes at film surface reduce potential screening effect caused free electrons material. Furthermore, additional carriers from conducting shift Fermi level help increasing output. Poly(3-hexylthiophene) (P3HT) was...
Non-lithographic fabrication of a self-aligned nanopore SERS array with large-area hexagonal symmetry is achieved by Au deposition on an anodized aluminum oxide (AAO) template. Precise self-formation plasmonic arrays facile structural tunability allows control the response, and results in highly reproducible, uniform, sensitive enhancement factor 107. Detailed facts importance to specialist readers are published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited...
Triboelectric nanogenerators are aspiring energy harvesting methods that generate electricity from the triboelectric effect and electrostatic induction. This study demonstrates of wind by a wind-rolling nanogenerator (WR-TENG). The WR-TENG generates as lightweight dielectric sphere rotates along vortex whistle substrate. Increasing kinetic converted is key factor in fabricating an efficient WR-TENG. Computation fluid dynamics (CFD) analysis introduced to estimate precise movements flow...
Stretchable and transparent electrodes have been developed for applications in flexible wearable electronics. For customer-oriented practical applications, the electrical optical properties of stretchable should be independent directions applied stress, such are called omnidirectionally electrodes. Herein, we report a simple cost-effective approach fabrication graphene with mechanical durability performance reliability. The use Fresnel lens-patterned electrode allows multilayered sheets to...
Abstract A mechanosensitive, visco‐poroelastic polymer ion pump that can rapidly establish a dense electrical double layer via mechanical pressure, thereby significantly enhancing output performance of an ionic triboelectric nanogenerator (iTENG), is described. working mechanism iTENG using highly suggested and the optimal characteristics are reported by investigating optical, mechanical, electrical, electrochemical properties. Surprisingly, pressure sensitivity reaches 23.3 V kPa −1 , which...
Abstract A general methodology is reported to create organic–inorganic hybrid metal halide perovskite films with enlarged and preferred‐orientation grains. Simply pressing polyurethane stamps hexagonal nanodot arrays on partially dried intermediate can cause pressure‐induced crystallization. This crystallization allows prepare highly efficient solar cells (PSCs) because the grains low‐angle grain boundaries in exhibit suppressed nonradiative recombination. Consequently, photovoltaic response...
An overview of recent advancement solid–liquid based TENGs (S–L TENGs) with respect to different physical and chemical properties as well interacting modes contact materials along its energy harvesting self-powered applications.
A sustainable highly charged C<sub>60</sub>-functionalized polyimide is introduced as the dielectric of a TENG, which generates higher output power and superior charge density with slower decay rate, compared perfluoroalkoxy alkane film-based TENG.
A new facile strategy to maximize the charge density over 1000 μC m −2 for a high-output TENG is demonstrated by introducing physics in contact electrification, i.e. ‘Electric-field-driven interfacial trapping of drifting triboelectric charges’.
Abstract In this work, we demonstrate the mode transition of charge generation between direct‐current (DC) and alternating‐current (AC) from transparent flexible (TF) piezoelectric nanogenerators (NGs), which is dependent solely on morphology zinc oxide (ZnO) nanorods without any use an AC/DC converter. Tilted ZnO grown a relatively low‐density seed layer generate DC‐type charges under pushing load, whereas vertically aligned high‐density create AC‐type generation. The mechanism for...