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윤상우,차재령,공명선 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
We have successfully decorated reduced graphene oxide (RGO) with silver nanoparticles (AgNPs) by microwaving silver alkylcarbamate for 13 seconds using 1-amino-4-methylpiperazine. Uniform AgNPs (20– 40 nm) were effectively prepared, and 1-amino-4-methylpiperazine acted as a reaction medium, reducing agent, and stabilizer. Particle size and morphology were correlated with the silver alkylcarbamate concentration and microwave time. The graphene/AgNPs composites were characterized by Raman, X-ray diffraction, and scanning electron microscopy to confirm that the AgNPs were uniformly decorated onto the graphene. Measurements of the transparent conductive property at room temperature indicated that these graphene/ AgNPs nanosheets with 55.45% transmittance were electrically continuous with a sheet resistance of approximately 43 kΩ/□.
윤상우 한국사회과학연구회 2007 동향과 전망 Vol.- No.2007
The Transformations of the Bureaucratic-Dominant Policy-Making Structures during the Post-Democratic Era. 민주화 이후 관료독점적 정책생산구조의 변형과 재편
윤상우,공명선 한국고분자학회 2014 Macromolecular Research Vol.22 No.10
A novel resistive-type micro-humidity sensor was constructed from an interdigitated micro-electrode ona flexible polyimide substrate of size 2.0×3.0 mm2. The humidity-sensing film was composed of a graphene oxidemodified with glycidyltrimethylammonium chloride (GO-GTMAC). We investigate the effect of water adsorptionon the electrical properties of GO-GTMAC films using the direct current (DC) measurement and alternating current(AC) complex impedance spectroscopy. The micro-humidity sensor was found to have a sensing range of 0.0268logΩ/%RH, a linearity of R2=0.987, a hysteresis of -1.3±0.2%RH, a response time of 70 s, and a temperature coefficientof 0.50±0.05%RH/°C.
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윤상우,김주한 한국정밀공학회 2023 한국정밀공학회지 Vol.40 No.4
The hydrophilicity of the cell culture substrate was controlled by depositing it on the alumina surface through the laserinduced backward transfer (LIBT) method. Alumina particles were sized using laser energy density and deposited on the soda lime glass surface. The particle size and hydrophilicity of the alumina deposition surface were evaluated by measuring the surface roughness, contact angle, and light diffusivity. As the particle size increased, the effect of alumina became stronger, and the deposited surface had relatively higher roughness, stronger hydrophilicity, and higher light diffusivity. The stronger the alumina effect, the lower the growth of Staphylococcus aureus on the deposited surface. In this study, it was confirmed that selective bacterial growth and culture could be controlled by adjusting the strength of the alumina coating using the LIBT process.