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Rapid Sintering of Copper Nano Ink Using a Laser in Air
유준호,강경태,황준영,이상호,강희석 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Copper nanoparticles are preferred as a printable conductive material in printed electronics because they cost less than noble nanoparticles such as gold and silver. Only disadvantage is that copper is easily oxidized, which may deteriorate the conductivity. Copperis thermodynamically unstable at atmospheric condition and is easily oxidized into either Cu2O or CuO, both of which are lessconductive compared to pure copper. To alleviate these problems, we propose a sintering process using laser in the study. The lasersource in this study is a laser having 532 nm wavelength and 5 W maximum output power. The size of used copper particle is 100~120nm. In order to measure the absorptivity at 532 nm, UV visible-spectrometer was used. Copper nano ink was spin-coated on the glasssubstrate, and various irradiated laser powers and scan rates were applied in air. The resistivity of the conductive film, after lasersintering under the condition of air, was below 5.3 μΩcm which was three times as much as that of bulk copper.
유준호,정성건,이창수,황준영,강경태,강희석,이상호 한국바이오칩학회 2015 BioChip Journal Vol.9 No.2
We introduce a process for the fabrication of a paper-based analytical device (PAD) for multiple colorimetric analysis via paper- cutting and inkjet-printing. To create the selective flow channels, hydrophobic barriers were formed by using hydrophobic polyvinyl chloride tape-cutting and ultraviolet-curable resin printing. Multiple paper channels were isolated by the hydrophobic barriers on a single chip. An assay modelwas created from bovine serum albumin (BSA) andtetrabromophenol blue (TBPB) to verify the feasibilityof the fabricated PAD. A multiple colorimetric analysiswas demonstrated a reaction with different BSAconcentrations after the TBPB regent was elaboratelydeposited onto the circular test spot areas by inkjetprinting.
유준호,노시균,이내호,양경무,차은정 대한성형외과학회 2011 Archives of Plastic Surgery Vol.38 No.4
Purpose: Liposarcoma is the most common soft tissue sarcoma, and usually occurs on the thigh or in the retroperitoneal space, but rarely in the oral region. This report presents a case of liposarcoma of the cheek and includes a review of the literatures. Methods: A 21-year-old woman was admitted with a palpable mass in her cheek of about two years duration, which increased in size gradually initially, but had increased rapidly over the three months. There was no particular pain or tenderness. MRI showed a well-enhanced, well-defined mass, which suspected to be hemangioma. Results: The spherical, well-encapsulated mass was surgically excised. Biopsy results revealed myxoid liposarcoma. FDG PET-CT on the seventh postoperative day, revealed a minimal to mild FDG-uptake soft tissue lesion around the mass defect area without evidence of distant metastasis. The patient is being observed and undergoing radiation therapy. Conclusion: Liposarcoma in the head and neck region is a rare disease, and can be overlooked as a benign tumor without a pathologic diagnosis. Therefore, proper treatment and follow-up are required based on an understanding of this disease.