Hee‐Tae Jung 교수

Layer-by-layer films comprised of alternating graphene and gold nanoparticle layers are readily produced by the two-step procedure involving the use of vacuum filtration of a reduced graphene oxide solution to fabricate the graphene thin film on the quartz substrate, followed by gold nanoparticle formation by spontaneous reduction of gold ions in a gold salt solution on the graphene films.

Equilibrium unilamellar vesicles are stabilized by one of two distinct mechanisms depending on the value of the bending constant. Helfrich undulations ensure that the interbilayer potential is always repulsive when the bending constant, K, is of order k(B)T. When K k(B)T, unilamellar vesicles are stabilized by the spontaneous curvature that picks out a particular vesicle radius; other radii are disfavored energetically. We present measurements of the bilayer elastic constant and the spontaneous

Gas molecules are known to interact with two-dimensional (2D) materials through surface adsorption where the adsorption-induced charge transfer governs the chemiresistive sensing of various gases. Recently, titanium carbide (Ti₃C₂T _x) MXene emerged as a promising sensing channel showing the highest sensitivity among 2D materials and unique gas selectivity. However, unlike conventional 2D materials, MXenes show metallic conductivity and contain interlayer water, i

Cuprous oxide (Cu2O) is one of the most promising materials for photoreduction of CO2 because of its high conduction band and small band gap, which enable the production of high-potential electrons under visible-light irradiation. However, it is difficult to reduce the CO2 using a Cu2O-based photocatalyst due to fast charge recombination and low photostability. In this work, we enhanced the photocatalytic CO2 conversion activity of Cu2O by hybridization of Cu2O NWAs, carbon layers, and BiVO4 nan

Both high static repellency and pressure resistance are critical to achieving a high-performance omniphobic surface. The cuticles of springtails have both of these features, which result from their hierarchical structure composed of primary doubly reentrant nanostructures on secondary microgrooves. Despite intensive efforts, none of the previous studies that were inspired by the springtail were able to simultaneously achieve both high static repellency and pressure resistance because of a genera

Abstract The p‐type semiconducting copper oxides (CuO and Cu 2 O) are promising materials for gas sensors, owing to their characteristic oxygen adsorption properties and low operation temperature. In this study, the sensing performance of a CuO‐based chemiresistor is significantly enhanced by incorporating Ag nanoparticles on high‐resolution p‐type CuO/Cu 2 O nanopattern channels. The high‐resolution CuO/Cu 2 O/Ag nanochannel is fabricated using a unique top‐down nanolithographic approach. The g

A new method for the preparation of graphene has been developed via porphyrin exfoliation of graphite in NMP. The exfoliation, which follows the intercalation of organic ammonium ions, is based on the pi-pi interaction between graphene and porphyrins. The graphene sheets prepared by this method show undisturbed sp(2) carbon networks.

Abstract Use of Cu and Cu + is one of the most promising approaches for the production of C 2 products by the electrocatalytic CO 2 reduction reaction (CO 2 RR) because it can facilitate CO 2 activation and CC dimerization. However, the selective electrosynthesis of C 2+ products on Cu 0 Cu + interfaces is critically limited due to the low electrocatalytic production of ethanol relative to ethylene. In this study, a novel porous Cu/Cu 2 O aerogel network is introduced to afford high ethanol pr

In mixtures of cetyltrimethylammonium bromide (CTAB) and sodium perfluorooctanoate (FC(7)) in aqueous solution, novel bilayer cylinders with hemispherical end caps and open, flat discs coexist with spherical unilamellar vesicles, apparently at equilibrium. Such equilibrium among bilayer cylinders, spheres, and discs is only possible for systems with a spontaneous curvature, R(o), and a positive Gaussian curvature modulus, kappa. We have measured the size distributions of the spherical vesicles,

The development of photocatalysts of CO2 reduction based on stable and Earth-abundant materials is essential for utilizing solar energy and storing it in chemical forms. Here, we report the synthesis and characterization of a composite material consisting of a few layers of MoS2 on a hierarchical porous structure of mesoporous TiO2 and macroporous 3D graphene aerogel (TGM) as a high-performance, robust, noble-metal-free photocatalyst of CO2 reduction. The hierarchical structure contributed to th

The power-conversion efficiency of an organic photovoltaic cell composed of poly(3-hexylthiophene) and (6,6)-phenyl-C61-butyric acid methyl ester is enhanced significantly by controlling the surface morphology of the photoactive layer. The hierarchical micro-/nanostructures of the active-layer surface are fabricated by nanoimprinting the active layer with a commercially available, anodic aluminum oxide (AAO) membrane filter (see image).

ADVERTISEMENT RETURN TO ISSUEEditorialNEXTThe Present and Future of Gas SensorsHee-Tae JungHee-Tae JungKorea Advanced Institute of Science Technology, Daejeon 34141, Republic of KoreaMore by Hee-Tae Junghttps://orcid.org/0000-0002-5727-6732Cite this: ACS Sens. 2022, 7, 4, 912–913Publication Date (Web):April 22, 2022Publication History Received1 April 2022Published online22 April 2022Published inissue 22 April 2022https://pubs.acs.org/doi/10.1021/acssensors.2c00688https://doi.org/10.1021/acssenso

Abstract Recently, it has been reported that liquid crystal (LC) defects can be used to create highly periodic templates by controlling the surface anchoring and the elastic properties of LC molecules. The self‐assembled defect ordering of the LC materials takes advantage of the ability to achieve fast stabilization of molecular ordering and structure due to the reversible and non‐covalent interactions of the LC molecules. In this Featre Article, the defect structures of liquid crystalline mater