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Graphene Gas Sensor Array Functionalized with Container Molecules
송현우,박철희,이윤호,오준학 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The conventional "lock-and-key" sensor system has a disadvantage of low accuracy and reliability due to the limitation of detecting performance for single analyte. In this study, a pattern recognition type organic electronic device sensor array was manufactured by introducing container molecules such as cyclodextrins and calixarenes. It was confirmed that the sensor array with various container molecules shows different current changes for several analytes. This study not only provides an effective strategy for manufacturing a high-sensitivity, large-area sensor array, but shows that the pattern recognition sensor array can be applied to IoT and healthcare devices.
VOCs Sensor based on Graphene Field Effect Transistor Functionalized with Container Molecules
송현우,오준학 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The conventional "lock-and-key" sensor system has disadvantages of low accuracy and reliability due to the limitation of detecting performance. In this study, a pattern recognition type organic electronic device sensor array was manufactured by introducing container molecules such as cyclodextrins and calixarenes. In this study, we suggested the sensor array with various container molecules which shows different current changes for several analytes. This study not only provides an effective strategy for manufacturing a high-sensitivity, large-area sensor array, but shows that the pattern recognition sensor array can be applied to IoT and healthcare devices.
광학식 입자 계수기 내 샘플 노즐 직경이 측정 효율 및 특성에 미치는 영향에 대한 실험적 연구
송현우,김태욱,송순호,Song, Hyunwoo,Kim, Taewook,Song, Soonho 한국입자에어로졸학회 2017 Particle and Aerosol Research Vol.13 No.4
The detection efficiency and characteristics of an optical particle counter (OPC), with various sample nozzle outlet diameters, were experimentally investigated. The OPC system, which was built with original design, was made up of a diode laser, two photodetectors, and a variety of optics such as a beam splitter and a concave mirror. The cone-shaped sampling nozzle was designed to be changeable to alter the outlet diameter, within the range of 1 to 3 mm. For samples, sets of polystyrene latex (PSL) standard particle with various sizes of 1 to $3{\mu}m$, were used. As a result, detection efficiency of the OPC greatly decreased with larger nozzle outlet diameter. Moreover, increased nozzle outlet diameter means broader sample flow, thus caused light interference and multiple scattering which results in abnormal high peaks in scattered light signal. The ratio of abnormal peaks to regular signal of single particle increased with larger nozzle outlet diameter.
Life Prediction of Thermal Barrier Coating Considering Degradation and Thermal Fatigue
송현우,김용석,이정민,윤정한,김대진,구재민,석창성 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.2
A thermal barrier coating (TBC) is used to protect gas turbine components from extreme environments. Typically, the TBC system consists of two parts: a ceramic top coat and metallic bond coat. Thus, the TBC system is exposed to thermal fatigue owing to the mismatch between the thermal expansions of the ceramic top coat and metallic bond coat. The durability of the TBC decreases with repeated thermal fatigue and degradation under high-temperature conditions, which can eventually result in failure. Therefore, the life of the TBC should be predicted while considering degradation and thermal fatigue. In this study, TBC specimens were produced under different degradation and thermal fatigue conditions, and the bond test was performed on these specimens. Based on the bond test results, the life of the TBC was predicted according to degradation and thermal fatigue.
송현우,최철,최경식,오제명,Song Hyunwoo,Choi Cheol,Choi Kyungshik,Oh Jemyung 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
Two different nanofluids were prepared by dispersing $Al_{2}O_3$ nanoparticles in transformer oil after hydrophobic surface modification. The agglomerated alumina nanoparticles with diameters from ${\mu}m$ to mm were ball-milled and then treated with surfactants such as lauric acid, stearic acid and oleic acid. The surface characteristics of modified nanoparticles were examined by FTIR spectroscopy. It showed that the hydrophobicity of nanoparticles was caused by esterification between hydroxyl groups on the particle surface and functional groups of surfactant. The shape and size distribution of ball-milled particles were analyzed by TEM and PSA. The results compared with the primary particles indicated that the size distributions of nanoparticles were dependant on milling times. The dispersion stability of modified nanoparticles dispersed in oil was highly dependent on the composition and amounts of surfactants.