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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.