Jisung Jang

High Field-Effect Mobility Bottom-Gated Metallorganic Chemical Vapor Deposition ZnO Thin-Film Transistors with SiO2 ∕ Si3N4 Bilayer Gate Dielectric

High Field-Effect Mobility Bottom-Gated Metallorganic Chemical Vapor Deposition ZnO Thin-Film Transistors with SiO2OSi3N4 Bilayer Gate Dielectric K. Remashan, Y. S. Choi, S. J. Park, and J. H. Jang Department of Information and Communications, Department of Nanobio Materials and Electronics, and Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, South Korea

ELIPatch, a thumbnail-size patch with immunospot array for multiplexed protein detection from human skin surface

Proteins secreted by skin have great potential as biomarkers for interpreting skin conditions. However, inconvenience in handling and bulky size of existing methods are existing limitations. Here, we describe a thumb-nail sized patch with the array of microdisks which captures multiple proteins from the skin surface. Microdisks with antibody on the surface enable multiplexed immunoassay. By self-assembly, microdisks are placed into 2-dimensional arrays on adhesive tape. The proposed Enzyme-Linked Immunospot array on a Patch shows sufficient sensitivity for IL-1α, IL1RA, IL-17A, IFN-g, and TNF-α, while IL-6 and IL-1β are non-detectable in some cases. As demonstrations, we quantified cytokines from different skin regions and volunteers in a high-spatial-resolution.

Micro pH Sensor Using Patterned Hydrogel with pH Indicators

This paper presents a study into pH Indicator-Embedded hydrogel micro-particles which are encoded various shapes according to the captured indicator. We incorporate various pH indicators into a photo-curable hydrogel, PEG-DA(Poly(ethylene glycol) diacrylate). Using the latest fluidic lithography techniques, we can easily fabricate variously patterned hydrogel particles based on in-situ photopolymerization of the PEG-DA in a micro-fluidic channel. The shape of the particle is related to the pH indicator inside the particle. We demonstrate that the micro pH sensors change their colors according to the pH levels. The micro pH sensors have various characteristics that are related to the curing time, particle size, etc. By changing these conditions, we can adjust the long term stability and reaction time of the hybrid micro pH sensors.