A5037351017- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Tactile and Sensory Interactions
- Polymer composites and self-healing
- Dielectric materials and actuators
- Supercapacitor Materials and Fabrication
- Interactive and Immersive Displays
- Advanced Materials and Mechanics
- Polydiacetylene-based materials and applications
- Aerogels and thermal insulation
- Advanced Thermoelectric Materials and Devices
- Covalent Organic Framework Applications
- Muscle activation and electromyography studies
- Music Technology and Sound Studies
- Plant Surface Properties and Treatments
- Electrospun Nanofibers in Biomedical Applications
- Perovskite Materials and Applications
- Advanced Memory and Neural Computing
- Graphene research and applications
- MXene and MAX Phase Materials
- Adhesion, Friction, and Surface Interactions
- Textile materials and evaluations
National University of Singapore
2024
Ulsan National Institute of Science and Technology
2014-2023
Government of the Republic of Korea
2018-2020
The Busan Metropolitan Simin Municipal Library
2014
Flexible pressure sensors with a high sensitivity over broad linear range can simplify wearable sensing systems without additional signal processing for the output, enabling device miniaturization and low power consumption. Here, we demonstrate flexible ferroelectric sensor ultrahigh response an exceptionally based on material structural design of composites multilayer interlocked microdome geometry. Due to stress concentration between arrays increased contact area in design, could perceive...
Multifunctional electronic skins have attracted considerable attention for soft electronics including humanoid robots, wearable devices, and health monitoring systems. Simultaneous detection of multiple stimuli in a single self-powered device is desired to simplify artificial somatosensory Here, inspired by the structure function human skin, an ultrasensitive multimodal sensor demonstrated based on interlocked ferroelectric copolymer microstructure. The triboelectric pyroelectric effects...
Ion channels transduce external stimuli into ion-transport-mediated signaling, which has received considerable attention in diverse fields such as sensors, energy harvesting devices, and desalination membrane. In this work, we present a photosensitive ion channel based on plasmonic gold nanostars (AuNSs) cellulose nanofibers (CNFs) embedded layered MXene nanosheets. The MXene/AuNS/CNF (MAC) membrane provides subnanometer-sized ionic pathways for light-sensitive cationic flow. When the MAC...
Ice-templated self-assembly is used for the integration of 2D graphene sheets into hierarchically porous nanoscroll networks.
Although ferroelectric composites have been reported to enhance the performance of triboelectric (TE) devices, their performances are still limited owing randomly dispersed particles. Herein, we introduce high-performance TE sensors (TESs) based on multilayer nanocomposites with alternating poly(vinylidenefluoride-co-trifluoroethylene) (PVDF-TrFE) and BaTiO3 (BTO) nanoparticle (NP) layers. The multilayers comprising soft/hard layers can induce stress concentration increase effective...
Textile-based sensors can perceive and respond to environmental stimuli in daily life, hence are critical components of wearable devices.
A smart hairy skin with hiearchical micro/nanoporous shape memory polymer enables dynamically adaptive thermal insulation.
Poly(vinylidene fluoride) (PVDF)/graphene oxide (GO) nanocomposite fibers were dry-jet wet spun at the GO concentrations of 0, 1, and 2 wt % with respect to polymer. The as-spun drawn in draw ratio (DR) range 2–6.5, correlation between PVDF chain conformation mechanical properties upon drawing has been studied by two-dimensional spectroscopy Fourier-transformed infrared, wide-angle X-ray diffraction, differential scanning calorimetry, tensile testing. PVDF/GO exhibited that mobile crystals...
Tailoring the crystal orientation of poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) has attracted widespread interest because its effects on ferroelectric properties required for various electronic devices. In this study, we investigated epitaxial growth PVDF-TrFE a chitin film developing triboelectric nanogenerators (TENGs). The crystallographic match between and enables development intended orientation, with polarization axis aligned perpendicular to substrate. addition,...
Abstract In the domains of wearable electronics, robotics, and Internet Things, there is a demand for devices with low power consumption capability multiplex sensing, memory, learning. Triboelectric nanogenerators (TENGs) offer remarkable versatility in this regard, particularly when integrated synaptic transistors that mimic biological synapses. However, conventional TENGs, generating only two spikes per cycle, have limitations used requiring repetitive high‐frequency gating signals to...
When we touch an object, thermosensation allows us to perceive not only the temperature but also wetness and types of materials with different thermophysical properties (i.e., thermal conductivity heat capacity) objects. Emulation such sensory abilities is important in robots, wearables, haptic interfaces, it challenging because they are directly perceptible sensations rather learned via experiences. Emulating human skin, introduce artificial based on intelligent thermo-/calorimeter (TCM)...
Highly stable conducting fibers have attracted significant attention in electronic textile (e-textile) applications. Here, we fabricate highly poly(vinyl alcohol) (PVA) nanocomposite with high thermal and chemical stability based on silver nanobelt (AgNB)/multiwalled carbon nanotube (MWCNT) hybrid materials as fillers. At 20 vol % AgNB/MWCNT, the electrical conductivity of fiber dramatically increased (∼533 times) from 3 up to 1600 S/cm after treatment at 300 °C for 5 min. Moreover,...
Thermoregulation is an essential function of the human body for adapting to surrounding temperature. Stimuli-responsive smart textiles can provide effective protection skin temperature from a continuously changing environment. Herein, we develop textile based on shape memory polymer (SMP) fibers adaptive regulation IR and water transmission skin. An SMP fabricated with hierarchical micro/nanoporous structures enhance thermal insulation performance, silver nanowires are coated one side...
High‐strength poly(vinyl alcohol) (PVA) composite fibers are successfully fabricated through gel spinning, and reinforced by poly(dopamine)‐coated graphene oxide (dGO) exterior reduced (rGO) coating. The mechanical properties of PVA/dGO show a dependence on the sheet size GO interfacial adhesion force is formed poly(dopamine) layers. ultimate tensile strength Young's modulus 1.58 27.2 GPa, 68.1% 97.1% higher than neat PVA fiber. In addition, there an 8.2% 21.4% increase relative to that...
Abstract Self‐healing transparent polymers are advantageous for various optoelectronic devices to improve resilience and durability. However, most of these materials have been applied only as flat films do not address the need optical structures that can manipulate light. Here microstructures embossed on a self‐healing polyurea film presented which autonomously recover from damage in ambient conditions. The high transmittance above 90% haze below 1.3%, Young's modulus 3.4 MPa. When...
Thermoregulation is an essential function of the human body for adapting to surrounding temperature. Stimuliresponsive smart textiles can provide effective protection skin temperature from a continuously changing environment. Herein, textile based on shape memory polymer (SMP) fibers developed adaptive regulation IR and water transmission skin. An SMP fabricated with hierarchical micro/nanoporous structures enhance thermal insulation performance, silver nanowires are coated one side...
Transepidermal water loss (TEWL) is emission from the skin induced by diffusion of molecules. Because TEWL sensitive to damage on outermost layer, it has been utilized as an indicator barrier function. Here, we demonstrate a stretchable hydration sensor monitor based porous thermoplastic polyurethane (TPU) film coated with ion conductive polyvinyl alcohol (PVA)/lithium chloride (LiCl) composite layers. The large surface area and hygroscopic PVA/LiCl layer structure exhibits remarkable...