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nanotube-diameters
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Growth of tin oxide nanotubes by aerial carbothermal evaporation
, Article Applied Physics A: Materials Science and Processing ; Volume 97, Issue 2 , 2009 , Pages 361-364 ; 09478396 (ISSN) ; Janfeshan, B ; Sadrnezhaad, Kh ; Sharif University of Technology
2009
Abstract
One-dimensional nanostructures of tin oxide nanotubes were fabricated by carbothermal evaporation at 900°C in air. The synthesized film was grown on Au-coated (100) Si substrate. Heterogeneous catalysis by Au/Sn droplets assisted the formation of the tin oxide nanotubes of less than 40 nm diameter at Sn vapor pressures around 1.4×10 -7 Pa. In order to reduce the nanotube diameter further, an increase in the Sn vapor pressure by changing the source materials' ratio seemed viable. © 2009 Springer-Verlag
Effect of vacancy defects on the fundamental frequency of carbon nanotubes
, Article 3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2008, Sanya, 6 January 2008 through 9 January 2008 ; 2008 , Pages 1000-1004 ; 9781424419081 (ISBN) ; Ahmadian, M. T ; Asempour, A ; Tajalli, S. A
2008
Abstract
Carbon nanotubes are widely used in the design of nanosensors and actuators. Any defect in the manufactured nanotube plays an important role in the natural frequencies of these structures. In this paper, the effect of vacancy defects on the vibration of carbon nanotubes is investigated by using an atomistic modeling technique, called the molecular structural mechanics method. Vibration analysis is performed for armchair and zigzag nanotubes with cantilever boundary condition. The shift of the principal frequency of the nanotube with vacancy defect at different locations on the length is plotted. The results indicate that the frequency of the defective nanotube can be larger or smaller or...