In this work we demonstrate that carbon nanotube junctions with an optional number, type (zigzag and/or armchair) and diameter of tubes can exist. We show a method for geometric construction of their models.

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A method is demonstrated for constructing models on which we show that carbon nanotubes with optional type and diameter can be connected to different three-dimensional surfaces. Basic examples (zigzag and armchair-type junctions and holes) are studied in this paper.

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