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이준석(Lee Junsok),곽윤근(Kwak Yoonkeun),김수현(Kim Soohyun) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, we proposed a new method to control the length of carbon nano tube in the single CNT<br/> probe. A single CNT probe was composed of a tungsten tip made by the electrochemical etching and carbon<br/> nano tube which was grown by CVD and prepared through the sonication. The two components were attached<br/> with the carbon tape. Since the length of CNT can not be controlled during the manufacturing, the post<br/> process is needed to shorten the CNT. In this paper, we proposed the method of electrochemical process. The<br/> process was done under the optical microscope and the results were checked by SEM. The diameter of the<br/> carbon nano tube used in this paper was about 130 because the above process had to be done with the<br/> optical microscope. Using the method proposed in this paper, we can control the length of the nano tube tip.
단분자 위치추적을 위한 원형 스캐닝 타입의 공초점 형광 현미경 설계
박효준(Hyojun Park),곽윤근(Yoonkeun Kwak),김수현(Soohyun Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Single molecule tracking technique has been widely used for studying biophysical processes, such as the diffusion of protein in cell membrane or the movement of molecular motors. A method to measure the position change of fluorescing single particles designed for a confocal fluorescence microscope. This method can be used to measure relative distance on the scale of 10nm with 1ms temporal resolution. By moving around the excitation beam in a circular orbit, photons emitted by fluorescence molecules are detected. The fluorescence signal depends on the relative position of the fluorescent molecule with respect to the circle of rotation. After each rotation, the center of rotation is moved to new position so that single molecule tracking can be achieved.
이준석(Lee Junsok),최재성(Choi Jaiseong),강경수(Kang Gyungsoo),곽윤근(Kwak Yoonkeun),김수현(Kim Soohyun) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this paper, we propose a method to estimate the actuating voltage of the nanotweezer made by manual assembly using carbon nanotube. The nanotweezer is composed of two CNT arms that are made by the multiwalled carbon nanotube and tungsten tip. Since the each CNT arm has the macro actuator, the nanotweezer can manipulate a large particle and it is possible to close and open the CNT arm repeatedly. The closing voltage, i.e., actuating voltage is calculated using the capacitance between the carbon nanotubes in CNT arm. We demonstrate the actuation of the nanotweezer using the voltage calculated with the electrostatic force.
단일 CNT 팁에서 탄소나노튜브의 에칭부피에 관한 연구
이준석(Lee Junsok),최재성(Choi Jaiseong),강경수(Kang Gyungsoo),곽윤근(Kwak Yoonkeun),김수현(Kim Soohyun) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Because of the various length condition of carbon nanotube, it is very confined the application area of the single CNT tip. In this paper, it was proposed the cutting technique of single CNT tip and the relationship between the etched volume and the amount of the applied charge. It is possible to control the length of single CNT tip arbitrary using this technique. The etched volume and length in the single CNT tip can be predicted with the amount of the applied charge. It is very easy to make a single CNT tip with proper length using this technique and to make nanotweezer that was composed two single CNT tips.