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김인태 ( In Tae Kim ),안태창 ( Tae Chang An ),임근배 ( Geun Bae Lim ) 한국센서학회 2013 센서학회지 Vol.22 No.5
We developed a one-step method for fabrication of addressable suspended SWNT films and demonstrate excellent detection performance of paraoxon based on OPH-immobilized SWNT films for environmental monitoring. For dispersed SWNT suspension, COOH-SWNT was prepared by the oxidation of carbon nanotubes using acid treatment and sonication. Suspended SWNT-film was fabricated between cantilever electrodes by dielectrophoretic force and surface tension of the water meniscus. After that, OPH were immobilized on suspended SWNT-films by nonspecific binding for enzymatic hydrolysis of paraoxon. The electrical properties of the SWNT films were measured in real time at room temperature. Structurally suspended SWNT films from substrate surface made possible rapid and highly sensitive detection of target molecules with increased convectional and diffusional fluxes of the molecules and with a large binding surface area. SWNT film FET resulted in a real-time, label-free, and electrical detection of paraoxon to the concentration of ca. 10 μm with a step-wise rapid response time of several seconds.
바이오센서 적용을 위한 미생물이 고정된 부양형 탄소나노튜브 필름 제작과 유기인 화합물 검출
김인태 ( In Tae Kim ),안태창 ( Tae Chang An ),김창섭 ( Chang Sup Kim ),차형준 ( Hyung Joon Cha ),김진호 ( Jin Ho Kim ),임수택 ( Soo Taek Lim ),임근배 ( Geun Bae Lim ) 한국센서학회 2014 센서학회지 Vol.23 No.1
Microbes have been used extensively in various fields of researches and industries but has not been used widely for microfluidic biosensor applications because it is difficult to immobilize properly to a small space. Therefore, we developed a microbial immobilization method for microfluidic devices using single-walled nanotubes and dielectrophoretic force. Single-walled nanotubes and Escherichia coli were aligned between two cantilever electrodes by a positive dielectrophoretic force resulting in a film of single-walled nanotubes with attached Escherichia coli. The optimal condition of film formation without a cell lysis was investigated. Diameter of single-walled nanotubes and electric field (intensity and duration of application) had an effect on the cell viability. On the other hand, the cell concentration of the suspension did not affect the cell viability. Paraoxon was detected using single-walled nanotubes film with attached Escherichia coli that expressed organophosphorus hydrolase. This film which is suspended from the substrate showed faster response time than sensors that are not suspended from the substrate.
Energy Consumption of Electric Vehicle with Roof-Mounted Solar Panel in Various Driving Situations
Dae-Jin Kim(김대진),Tae-Chang An(안태창),Jeong-Min Kim(김정민) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.3
This study entailed simulations of an electric vehicle (EV) wherein electricity was produced solely by a roof-mounted solar panel while being driven. Energy consumptions of the EV was evaluated for four driving cycles, confirming energy consumption reductions of 0.26%–5.47%. If the stopping time is prolonged (e.g., because of waiting at a traffic signal), the battery consumption of the EV decreases proportionally with increased charging from the solar panels. However, in aggressive driving cycles, the effect of the solar panel decreases. This is because aggressive driving cycle consume more energy, proportionally reducing the energy used from the solar panel.
부양형 탄소나노튜브 나노시트를 이용한 pH센서의 제작과 보정
유효봉 ( Hyo Bong Ryu ),최우석 ( Woo Seok Choi ),안태창 ( Tae Chang An ),허준성 ( Joon Seong Heo ),임근배 ( Geun Bae Lim ) 한국센서학회 2013 센서학회지 Vol.22 No.3
In this research, the pH sensor was developed using CNT nanosheet with Nafion coating for the advanced medical sensor such as a blood gas analyzer. The CNT nanosheet was formed by dielectrophoresis and water-meniscus between cantilever-type electrodes. Then, the process of the heat annealing and the Nafion coating was conducted for reducing contact resistance and giving proton selectivity respectively. We measured the response of the pH sensor as the electrolyte-gated CNT-nanosheet field effect transistor. The sensor showed a linear current ratio in a similar range of the normal blood pH. The calibration method was also introduced for decreasing the response variation of between sensors. Coefficient of variance of the pH sensor was decreased by applying the calibration method. A linear relation between the calibrated response of the sensors and pH variance was also obtained. Finally, the pH sensor with a high resolution was fabricated and we verify the feasibility of the sensor by applying the calibration method.