Hanyang University · Materials Science
Professor Kwang-Suk Jang's research lab specializes in the development of advanced carbon nanotube-based nanocomposites for sustainable energy applications, with a primary focus on organic thermoelectrics and functional membranes. The lab pioneers scalable fabrication techniques—such as spray-coating, wet-spinning, and bar-coating—to create high-performance, flexible, and free-standing thermoelectric materials using polymers like P3HT, PVDF, and cellulose acetate. A key research direction involves enhancing thermoelectric performance through controlled doping (e.g., with polyethylenimine) and nanostructure engineering of single-walled carbon nanotubes. Additionally, the lab explores mesoporous silica membranes for selective gas separation, particularly CO₂ capture, demonstrating a multidisciplinary approach to energy and environmental technologies.
Figures are computed from collected data and may differ slightly.
We report the fabrication of high-performance thermoelectric carbon nanotube/poly(3-hexylthiophene) (CNT/P3HT) nanocomposite films and flexible CNT/P3HT organic thermoelectric generators by spray-printing.
This study investigates a treatment method with ethylene glycol for improving the thermoelectric properties of CNT/PEDOT:PSS nanocomposite films.
Single-walled carbon nanotube (SWCNT)/poly(3-hexylthiophene) (P3HT) hybrid films doped by spin-coating exhibited power factors up to 308 µW m<sup>−1</sup> K<sup>−2</sup>.
Thin, continuous, mesoporous silica membranes are formed on polymeric hollow fibers via liquid-phase coating at roomtemperature and aging with tetraethylorthosilicate (TEOS) vapor at 100 °C. After liquid extraction of the surfactant template and mesopore infiltration with an aminoalkyloctasilsesquioxane, the membrane displays CO2-selective gas permeation properties.
High-performance thermoelectric composite fibers were prepared via simple wet-spinning of single-walled carbon nanotube (SWCNT)/poly(vinylidene fluoride) (PVDF) pastes using a common solvent/coagulation system. By improving the content and dispersion state of SWCNTs in the composite fibers, the thermoelectric performance could be effectively enhanced. With n-type doping of SWCNTs using polyethylenimine, high-performance n-type SWCNT/PVDF composite fibers could be prepared. The power factors of t
Free-standing single-walled carbon nanotube (SWCNT)/cellulose acetate composite films were fabricated by a simple bar-coating method. As a paste solvent, acetone, a low-boiling-point solvent, was used. By simple brushing of a polyethylenimine/ethanol solution, n-type thermoelectric composite films could be obtained. The optimal p-type and n-type power factors of the free-standing thermoelectric films were 1.41 ± 0.22 and 0.516 ± 0.172 μW cm–1 K–2, respectively, at room temperature. We also fabri
Freestanding single-walled carbon nanotube (SWCNT) buckypapers with thicknesses of ∼30 μm are fabricated using a simple bar-coating process. The Seebeck coefficient and electrical conductivity of the SWCNT buckypapers are affected by the composition of the dispersion solvent mixture. The maximum p-type power factor of a SWCNT buckypaper is 411 ± 13 μW m<sup>-1</sup> K<sup>-2</sup>. The inverse relationship between the Seebeck coefficient and electrical conductivity of the SWCNT buckypapers may b
Influence of film thickness and crystallinity of poly(3-hexylthiopene) (P3HT) on the thermoelectric properties of doped P3HT films was systematically investigated.
We developed a solution-processable, thin, and high-dielectric polyurea-based organic gate insulator for low-voltage operation and high performance of organic thin-film transistors (OTFTs). A 60 nm-thick polyurea thin film exhibited a high dielectric constant of 5.82 and excellent electrical insulating properties owing to strong hydrogen bonding. The hydrogen bonding of the synthesized polyurea was confirmed using infrared spectroscopy and was quantitatively evaluated by measuring the interactiv
Thermoelectric inorganic films are flexible when sufficiently thin. By removing the substrate, that is, making them free-standing, the flexibility of thermoelectric films can be enhanced to the utmost extent. However, studies on the flexibility of free-standing thermoelectric inorganic films have not yet been reported. Herein, the high thermoelectric performance and flexibility of free-standing thermoelectric Ag<sub>2</sub>Se films are reported. Free-standing Ag<sub>2</sub>Se films with a thickn
High-performance thermoelectric all-carbon heterostructures are investigated. The carbon nanoparticle barrier between carbon nanotubes can enhance the thermoelectric performance due to the energy filtering effect.
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