Experimental Procedures (IMAGE)
Caption
Figure 2. Experimental procedures for the tensile strength measurement. a Individual nanotube directly synthesized over an open slit. b Broadband Rayleigh scattering spectra of three nanotube species used for the chiral structure assignment. c Pick-up operation of an individual nanotube using a micro fork. d Setting a nanotube on the microelectromechanical system (MEMS) device. e Image taken at the moment of nanotube fracture during the tensile test. The black arrow indicates the direction of actuator stage movement. Figure 3. Structure dependence of the ultimate tensile strength. a The tensile strengths of the (n,m) nanotubes are indicated by the circle diameters. b, c The tensile strengths are plotted as a function of the chiral angle (b) and diameter (c). Figure 4. Clear relation between ultimate tensile strength and structure. θ and d are chiral angle and diameter, respectively. f(θ) is a factor considering the effective stress on carbon-carbon bonds. The square root dependence of d takes stress concentration at structural defects into account.
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Nagoya University
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