A5024456041- Advanced Thermoelectric Materials and Devices
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Thermal Radiation and Cooling Technologies
- Thermal properties of materials
- Molecular Junctions and Nanostructures
- Advanced biosensing and bioanalysis techniques
- Graphene research and applications
- Carbon Nanotubes in Composites
- Dielectric materials and actuators
- Nanomaterials and Printing Technologies
- Supercapacitor Materials and Fabrication
- RNA Interference and Gene Delivery
- Advancements in Battery Materials
- Organic Electronics and Photovoltaics
- Lipid Membrane Structure and Behavior
- Innovative Energy Harvesting Technologies
- Lignin and Wood Chemistry
- Nanowire Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Tactile and Sensory Interactions
- Perovskite Materials and Applications
- Glaucoma and retinal disorders
- Advanced battery technologies research
- Food Quality and Safety Studies
Yonsei University
2018-2025
Korea Institute of Science and Technology
2016-2025
Shaikh Khalifa Medical City
2023-2025
Severance Hospital
2018-2024
Jeonbuk National University
2020-2024
Yong In University
2023
Seoul National University
2000-2023
Korea Research Institute of Chemical Technology
2023
Korea University of Science and Technology
2014-2023
Seoul Institute
2016-2019
Abstract Softening of thermoelectric generators facilitates conformal contact with arbitrary-shaped heat sources, which offers an opportunity to realize self-powered wearable applications. However, existing devices inevitably exhibit reduced conversion efficiency due the parasitic loss in high-thermal-impedance polymer substrates and poor thermal arising from rigid interconnects. Here, we propose compliant intrinsically stretchable interconnects soft conductors that achieve high performance...
As practical interest in flexible/or wearable power-conversion devices increases, the demand for high-performance alternatives to thermoelectric (TE) generators based on brittle inorganic materials is growing. Herein, we propose a flexible and ultralight TE generator (TEG) carbon nanotube yarn (CNTY) with excellent performance. The as-prepared CNTY shows superior electrical conductivity of 3147 S/cm due increased longitudinal carrier mobility derived from highly aligned structure. Our TEG...
To allow for the use of graphene in various nanoelectronic applications, methods large-scale production with controllable electrical properties need to be developed. Here, we report results a fundamental study on remarkable conversion between n- and p-type reduced oxide (rGO) changes thermal annealing temperature. It was found that charge carriers rGO temperatures 300–450 °C 800–1000 are electrons (n-type), whereas 450–800 °C, they holes (p-type). This is because individual oxygen functional...
As commercial interest in flexible power‐conversion devices increases, the demand for high‐performance alternatives to brittle inorganic thermoelectric (TE) materials is growing. an alternative, we propose a rationally designed graphene/polymer/inorganic nanocrystal free‐standing paper with high TE performance, flexibility, and mechanical/chemical durability. The ternary hybrid system of includes two heterojunctions that induce double‐carrier filtering, which significantly increases...
Thick inorganic shells endow colloidal nanocrystals (NCs) with enhanced photochemical stability and suppression of photoluminescence intermittency (also known as blinking). However, the progress using thick-shell heterostructure NCs in applications has been limited due to low quantum yield (PL QY ≤ 60%) at room temperature. Here, we demonstrate CdS/CdSe/CdS seed/spherical well/shell (SQW) geometry that exhibit near-unity PL temperature blinking. In SQW NCs, lattice mismatch is diminished...
A layer-by-layer deposition of two conducting polymers, each layer which is a few tenths nanometer thick, has been successfully performed to enhance the thermoelectric power factor organic thin films.
Abstract For the utilization of graphene in various energy storage and conversion applications, it must be synthesized bulk with reliable controllable electrical properties. Although nitrogen-doped shows a high doping efficiency, its properties can easily affected by oxygen water impurities from environment. We here report that boron-doped nanoplatelets desirable prepared simultaneous reduction boron-doping oxide (GO) at annealing temperature. B-doped 1000 °C show maximum boron concentration...
Using simple microwave irradiation under the presence of sodium amide as a nitrogen source, preparation nitrogen-doped graphene nanosheets has been successfully demonstrated. It is notable that exfoliation and doping graphite to simultaneously occurred during within minute, content doped could reach up 8.1%. was also found binding configuration atom on graphitic layer consisted various nitrogen-containing moieties such pyridine-N, pyrrolic-N, quaternary-N, their composition changed function...
We report a new hole transporting material (HTM) based on [2,2]paracyclophane triarylamine. Due to its higher charge mobility compared with spiro-OMeTAD, the solar cell device incorporating HTM achieved high photovoltaic performance PCE of 17.6%.
Electrochemical CO2 reduction is always accompanied by a competitive hydrogen evolution reaction as water used source. In addition to intrinsic activity control, geometrical factors of electrocatalysts such their porous structure have been demonstrated affect the selectivity, but understanding its origin still important. Herein, we demonstrate that reduced graphene oxide layers can effectively control Faradaic efficiency for CO production zinc nanoparticle electrocatalysts. Simply tuning...
With the continuous development of flexible and wearable thermoelectric generators (TEGs), high-performance materials their integration into convenient devices have to be considered. Herein, we demonstrated highly aligned wet-spun carbon nanotube (CNT) fibers by optimizing liquid crystalline (LC) phase via hydrochloric acid purification. The facilitates better alignment CNTs during fiber extrusion, resulting in high power factor 2619 μW m–1 K–2, which surpasses those dry-spun CNT yarns. A...
Abstract Flexible thermoelectrics that enable conformal contact with heat sources of arbitrary shape are indispensable for self‐powered wearable electronics. Scalable integration flexible thermoelectric (TE) materials into functional devices has improved over the past few years, however, practical applications TE still hindered by low performance. Herein, highly aligned carbon‐nanotube yarns (CNTYs) proposed, combined selective doping via picoliter scale inkjet printing. Coagulation assisted...
Abstract Compliant thermoelectric generators (TEGs) can fully exploit their energy conversion efficiency by establishing conformal interfaces on arbitrarily shaped 3D heat sources. Although additive manufacturing processes allow scalable fabrication with flexibility and customizability, most printable TEGs are fabricated as planar‐type devices that harvest only in the in‐plane direction. Herein, 3D‐compliant solely using direct ink writing, which enables thermal‐transfer optimization for...
Electrically conductive polymer nanocomposites have been applied extensively in many fields to develop the next generation of devices. Large amounts nanofillers matrices are, however, often required for a sufficiently high electrical conductivity, which turn deteriorates desired thermomechanical properties. We illustrate novel but facile strategy improve conductivity and property silver nanowire/polymer nanocomposites. find that one may increase by up about 8 orders magnitude introducing...
For next-generation wearable and implantable devices, energy storage devices should be soft mechanically deformable easily printable on any substrate or active devices. Herein, we introduce a fully stretchable lithium-ion battery system for free-form configurations in which all components, including electrodes, current collectors, separators, encapsulants, are intrinsically printable. The electrode acquires intrinsic stretchability improved interfacial adhesion with the materials via...
As the turnaround time of diagnosis becomes important, there is an increasing demand for rapid, point-of-care testing (POCT) based on polymerase chain reaction (PCR), most reliable diagnostic tool. Although optical components in real-time PCR (qPCR) have quickly become compact and economical, conventional instruments still require bulky thermal systems, making it difficult to meet emerging needs. Photonic PCR, which utilizes photothermal nanomaterials as heating elements, a promising...
Porous thermoelectric materials offer exciting prospects for improving the performance by significantly reducing thermal conductivity. Nevertheless, porous structures are affected issues, including restricted enhancements in attributed to decreased electronic conductivity and degraded mechanical strength. This study introduces an innovative strategy overcoming these challenges using Bi0.4Sb1.6Te3 (BST) combining structuring interface engineering via atomic layer deposition (ALD). BST powder...
Recent studies have demonstrated that carbon, in the form of diamond, can be functionalized with molecular and/or biomolecular species to yield interfaces exhibiting extremely high stability and selectivity binding target biomolecules solution. However, diamond most other crystalline forms carbon involve high-temperature deposition or processing steps restrict their ability integrated materials. Here, we demonstrate photochemical functionalization amorphous films followed by covalent...
With the increase in practical interest flexible thermoelectric (TE) generators, demand for high-performance alternatives to brittle TE materials is growing. Herein, we have demonstrated wet-spun CNT fibers with high performance by systematically controlling longitudinal carrier mobility without a significant change concentration. The optimized alignment increases electrical conductivity decreasing thermopower, thus improving power factor. On further adjusting charge carriers via mild...
A high-performance, wearable thermoelectric generator (TEG) was fabricated with a highly aligned carbon nanotube (CNT) sheet. The CNT sheet exhibits extraordinary electrical conductivity compared to disordered sheets and also can be directly as continuous TEG without metal electrode interconnects. This provides significant reduction in contact resistance between TE legs electrodes traditional TEGs, resulting higher power output. In addition, the continuity of module any disconnected parts...
We have rationally designed a bracelet-type thermoelectric generator based on carbon nanotube ink printed directly onto flexible cable.