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Flow-Induced Planar Assembly of Parallel Carbon Nanotubes and Crossed Nanotube Junctions

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We report the in-situ assembly of carbon nanotubes by chemical vapor deposition of hydrocarbon precursor (a solution of ferrocene dissolved in isopropyl alcohol). We utilized the vapor stream inside the reaction chamber to comb carbon nanotubes along the same direction and obtained two-dimensional (planar) assembly of nanotubes with tunable distributions. When the carbon source was flowing at a relatively higher rate of ∼0.2 ml/min, most of nanotubes were driven along the vapor flow direction during their growth process and formed a thin freestanding mat featured with a parallel arrangement, whereas a lower flowing rate (∼0.05 ml/min) only resulted in random spider-web structures consisting of crossed nanotube junctions with a variety of configurations (e.g., "+," "Y," "T" shapes and twists). The measured direction-dependent electrical resistance of these two assemblies was in agreement with respective structures, which was anisotropic for parallel nanotubes and nearly isotropic for random networks. Such large-area planar carbon nanotube arrays with controlled orientation and various junction configurations will facilitate the design and fabrication of electronic and mechanical devices.
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Document Type: Short Communication

Publication date: 01 July 2005

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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