Hanyang University · Materials Science
Professor Yong-Ho Choa's research lab specializes in the design, synthesis, and application of advanced nanomaterials for next-generation electronic and sensing devices. The lab focuses on developing low-cost, high-performance nanomaterials such as graphene, metal oxides, and chalcogenide nanostructures through innovative fabrication techniques like inkjet printing, electrospinning, and plasma-assisted synthesis. Key research directions include the development of flexible, wearable, and room-temperature gas sensors for environmental and industrial safety, with a strong emphasis on enhancing electrical conductivity, interfacial adhesion, and sensitivity using tailored nanostructures and surface engineering. The lab also explores scalable and eco-friendly synthesis methods for functional nanoparticles, particularly for energy and sensing applications.
Figures are computed from collected data and may differ slightly.
Monodispersed nano Pt catalyzed linear dense assembly of SWCNTs bundles on a noble multi-layered electrode system for cost-effective hydrogen sensor.
Ink-jet printed conductive copper patterns with enhanced substrate adhesion were fabricated using a conductive copper ink containing a silane coupling agent as an adhesion promoter. The effect of the silane coupling agent on the copper complex ion ink properties, including viscosity and surface tension, was systematically investigated. The copper complex ion ink that was ink-jet printed on a polyimide film was transformed to copper films by thermal treatment at 200 °C for 2 h in H2. The phase, m
Inkjet-printed electronics using metal particles typically lack electrical conductivity and interfacial adhesion with an underlying substrate. To address the inherent issues of printed materials, this Research Article introduces advanced materials and processing methodologies. Enhanced adhesion of the inkjet-printed copper (Cu) on a flexible polyimide film is achieved by using a new surface modification technique, a nanostructured self-assembled monolayer (SAM) of (3-mercaptopropyl)trimethoxysil
A suitable and non-invasive methanol sensor workable in ambient temperature conditions with a high response has gained wide interest to prevent detrimental consequences for industrial workers from its low-level intoxication. In this work, we present a tunable and highly responsive ppb-level methanol gas sensor device working at room temperature via a bottom-up synthetic approach using exfoliated graphene sheet (EGs) and ZnO quantum dots (QDs) on an aluminum anodic oxide (AAO) template. It is ver
Electrospinning and galvanic displacement reaction were combined to synthesize ultra-long hollow tellurium (Te) nanofibers with controlled dimensions, morphology and crystallinity by simply tailoring the electrolyte concentration applied. Within different morphologies of nanofibers, the branched Te nanostructure shows the greatest sensing performance towards NO2 at room temperature.
Nitrogen doped TiO<sub>2</sub> (N-TiO<sub>2</sub>) nanoparticles were synthesized via a novel plasma enhanced electrolysis method using bulk titanium (Ti) as a source material and nitric acid as the nitrogen dopant. This method possesses remarkable merits with regard to the direct-metal synthesis of nanoparticles with its one-step process, eco-friendliness, and its ability to be mass produced. The nanoparticles were synthesized from bulk Ti metal and dipped in 5-15 mmol of a nitric acid electrol
Selective filtration of near-infrared (NIR) regions is of primary importance to energy saving via thermal shielding. However, uniform coating of highly effective nanomaterials on flexible substrates remains very challenging. Here, we introduce new material processing and fabrication methodologies that manufacture electrospun copper sulfide/polyvinylpyrrolidone (CuS/PVP) nanowires for enhanced thermal shielding efficiency. Electrospinning offers well-dispersed CuS nanoparticles in a thermal shiel
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