نتایج جستجو برای: vertically aligned carbon nanotubes

تعداد نتایج: 328620  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Kohei Mizuno Juntaro Ishii Hideo Kishida Yuhei Hayamizu Satoshi Yasuda Don N Futaba Motoo Yumura Kenji Hata

Among all known materials, we found that a forest of vertically aligned single-walled carbon nanotubes behaves most similarly to a black body, a theoretical material that absorbs all incident light. A requirement for an object to behave as a black body is to perfectly absorb light of all wavelengths. This important feature has not been observed for real materials because materials intrinsically...

2009
Liang Zhang Zhongrui Li Yongqiang Tan Giulio Lolli Nataphan Sakulchaicharoen Félix G. Requejo B. Simon Mun Daniel E. Resasco

The time evolution of the growth process of vertically aligned single-walled carbon nanotubes (or V-SWNTs) on a flat substrate was examined by scanning electron microscopy (SEM), resonant Raman spectroscopy, and angle-resolved X-ray absorption near-edge structure (XANES). This detailed characterization gives evidence for the growth of a thin layer (crust) of randomly oriented single-walled carb...

Journal: :Advanced materials 2010
Michael De Volder Sameh H Tawfick Sei Jin Park Davor Copic Zhouzhou Zhao Wei Lu A John Hart

A new technology called capillary forming enables transformation of vertically aligned nanoscale filaments into complex three-dimensional microarchitectures. We demonstrate capillary forming of carbon nanotubes into diverse forms having intricate bends, twists, and multidirectional textures. In addition to their novel geometries, these structures have mechanical stiffness exceeding that of micr...

2004
Erik Einarsson Tadao Edamura Yoichi Murakami Toshiaki Nishii Shigeo Maruyama

The growth process of vertically aligned single-walled carbon nanotube (SWNT) films was investigated by means of in situ optical analysis and scanning electron microscopy. The measurements reveal that the growth of the SWNT film decreases after longer reaction times. This decrease is attributed to a combination of a diminishing growth rate and burning of the SWNTs due to oxygen in the growth ch...

2011
Shelby B. Hutchens Alan Needleman Julia R. Greer

We carry out axisymmetric, finite deformation finite element analyses of the uniaxial compression of cylindrical bundles of vertically aligned carbon nanotubes (VACNTs) firmly attached to a Si substrate. A compressible elastic–viscoplastic constitutive relation with a piecewise, linear hardening–softening–hardening flow strength is used to model the material. Calculations are performed for VACN...

Journal: :Nanotechnology 2010
N G Shang Y Y Tan V Stolojan P Papakonstantinou S R P Silva

We report the low-temperature growth of vertically aligned carbon nanotubes (CNTs) at high growth rates by a photo-thermal chemical vapour deposition (PTCVD) technique using a Ti/Fe bilayer film as the catalyst. The bulk growth temperature of the substrate is as low as 370 °C and the growth rate is up to 1.3 µm min(-1), at least eight times faster than the values reported by traditional thermal...

2003
N. L. Rupesinghe M. Chhowalla K. B. K. Teo A. J. Amaratunga

A field emission vacuum switch using vertically aligned carbon nanotubes grown by a direct current plasma enhanced chemical vapor deposition is reported. Cathodes with optimized field emission properties were evaluated in diode configuration as a test vehicle for the construction of a vacuum power three terminal triode device. Limiting factors such as space charge effects involved with high cur...

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