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Y-junction carbon nanotubes (CNTs) grown by hot-filament chemical vapor deposition (HFCVD) method have been investigated by transmission electron microscopy (TEM). A fish-bone like feature has been observed on the tubes around the Y-junction. It is found that all the Y-junctions have a predominant branching angle ranging from 50-80 o , roughly twice the reported bending angles of single bend...
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