http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Tensile Properties of a ZnS Nanowire Determined with a Nano-manipulator and Force Sensor
장훈식,남승훈,이학주,Jung Han Kim,오규환 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.3
Tensile tests of an individual ZnS nanowire with a cubic structure were performed with a nanomanipulator inside a scanning electron microscope (SEM). To perform the tensile test of ZnS nanowires, a mechanical testing system was installed in the SEM. A nano-manipulator was set up in the SEM, and a cantilever force sensor was mounted on the nano-manipulator. The force sensor could be controlled with the nano-manipulator. The ZnS nanowires were dispersed on the transmission electron microscope (TEM) grid; then, the ends of the ZnS nanowires were welded to the TEM grid and the tip of force sensor by exposing them to the E-beam of the SEM. The tensile tests of the ZnS nanowires were performed by controlling the nano-manipulator in the SEM. The load response during the tensile tests was obtained with a force sensor. The strain-stress curve was obtained from the tensile load-displacement curve after the tensile test. The tensile strengths for nanowires 1, 2, and 3 were 364.7 ± 5.2, 146.2 ± 5.2, and 234.4 ± 5.2 MPa, respectively, and the elastic moduli for nanowires 1, 2, and 3 were 39 ± 5.2, 33.4 ± 5.2, and 37.4 ± 5.2 GPa, respectively.
Measurement of The Electrical Resistance During Elongation of a Multi-Walled Carbon Nanotube
장훈식,이윤희,남승훈,남영현,이상혁 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
The response of an individual multi-walled carbon nanotube (MWCNT) to mechanical strain, applied using a tungsten tip via a nano-manipulator controlled by a personal computer, was investigated inside a scanning electron microscope. The contact resistance between an individual MWCNT and the tungsten tip decreased during exposure to the electron beam. The electrical resistance was significantly changed during the elongation process. The value of the electrical resistance was stable during elongation state of the tube; then, the resistance value completely recovered to initial value after the tube length had recovered to its initial state. When the nanotube was fully elongated, the value of the resistance was 1.76 times its initial value. The resistance was also observed to increase abruptly at the start of tube fracture. As the nanotube was further fractured, the measured electrical resistance approached infinity.
다중벽 탄소나노튜브의 기계적-전기적 물성 과 나노튜브 시트 특성
장훈식(Hoon-Sik Jang),전상구(Sang Koo Jeon),정인현(In Hyun Jeong),박종서(Jong-Seo Park),남승훈(Seung Hoon Nahm) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The mechanical and electrical properties of a multi walled carbon nanotubes (MWCNTs) were investigated inside a scanning electron microscope. The mechanical strain was applied to the MWCNT by a tungsten tip controlled by a nano-manipulator. The tensile strength of the MWCNT was about 41.01 GPa and the elastic modulus was calculated at 0.98 TPa. The electrical resistance was significantly changed during the elongation process of the MWCNT and corresponded with the nanotube strain. The strain sensitivity of a single MWCNT was calculated to be around 25. We also investigated a flexible transparent film using the spinning MWCNTs. The MWCNT sheets were produced by continuously pulling out from super well-aligned MWCNTs on a substrate. The MWCNT sheet films were produced simply by direct coating on the flexible film or grass. Single and double sheets were produced with sheet resistance of ~699 and ~349 Ω/sq, respectively, transmittance of 81~85 % and 67~72 %, respectively.