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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.
장훈식(Hoon-Sik Jang),이윤희(Yun-Hee Lee),백운봉(Un-Bong Baek),박종서(Jong-Seo Park),남승훈(Seung-Hoon Nahm) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Carbon nanotubes (CNTs) have attracted an increasing attention due to their superior mechanical properties and potential application in industries. The strength of CNT has been predicted or calculated through several simulation techniques but actual experiments on stress-strain behavior are rare due to its dimensional limit, nanoscale positioning/manipulation, and instrumental resolution. We have attempted to observe straining responses of a multi-walled carbon nanotube (MWNT) with different growth methods by performing an in-situ tensile testing in a scanning electron microscope. Linear deformation and fracture behaviors of MWNT were successfully observed and its force-displacement curve was also measured from the bending stiffness and displacement of the force sensor and manipulator. We also obtained different tensile load of carbon nanotube with different growth methods.
장훈식(Hoon-Sik Jang),권성환(Sung-Hwan Kwon),이윤희(Yun-Hee Lee),백운봉(Un-Bong Baek),김엄기(Am-Kee Kim),남승훈(Seung-Hoon Nahm) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
??The response of multi walled carbon nanotube(MWNT) to mechanical strain applied with an nano-manipulator were investigated inside scanning electron microscope (SEM). MWNT were produced by arc-discharge method and specimens for tensile test were selected among the MWNT which has rectilinearity and purity above 40%. The average diameter of MWNT was approximately 15㎚. In order to measure the resistance of MWNT during tensile test, an individual MWNT was attached at the tungsten (W) tip using electron beam induced deposition. The contact resistance between MWNT and W tip decrease during the exposure of electron beam. The W tip were manipulated and controlled by nano-manipulator and personal computer. We observed that resistance of samples was significantly changed until the MWNT fracture.
전상구(Sang-Gu Jeon),장훈식(Hoon-Sik Jang),권오헌(Oh-Heon Kwon),남승훈(Seung Hoon Nahm) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.2
다양한 분야에 활용이 가능한 나노소자의 개발과 나노소자의 수명 및 신뢰성을 결정하기 위해서 나노구조체의 역학물성 측정은 중요하다. 본 연구에서는 다중벽탄소나노튜브(MWCNT)와 산화아연나노막대(ZnO nanorod)의 인장시험을 전자주사현미경(SEM) 내부에서 수행하였다. 챔버내부에 구축된 나노조작기 앞에 힘센서가 장착되었고, 나노조작기는 조이스틱과 컴퓨터로 제어 가능하도록 설계되었다. 반으로 자른 투과전자현미경(TEM)그리드 위에 분산된 나노구조체는 전자주사를 통하여 힘센서와 고정된 후 인장시험이 수행되었다. 인장시험 후 TEM과 SEM을 통하여 파단면을 측정하였고 MWCNT와 ZnO nanorod의 탄성계수는 0.98TPa, 55.85㎬로 각각 측정되었다. It is important to measure the mechanical properties of nanostructures because they are required to determine the lifetime and reliability of nanodevices developed for various fields. In this study, tensile tests for a multi-walled carbon nanotube (MWCNT) and a ZnO nanorod were performed in a scanning electron microscope (SEM). The force sensor was a cantilever type and was mounted in front of a nanomanipulator placed in the chamber. The nanomanipulator was controlled using a joystick and personal computer. The nanostructures dispersed on the cut area of a transmission electron microscope (TEM) grid were gripped with the force sensor by exposing an electron beam in the SEM; the tensile tests were the performed. The in situ tensile loads of the nanostructure were obtained. After the tensile test, the cross-sectional areas of the nanostructures were observed by TEM and SEM. Based on the TEM and SEM results, the elastic modulus of the MWCNT and ZnO nanorod were calculated to be 0.98 TPa and 55.85 ㎬, respectively.