Methods for forming freestanding nanotube objects and objects so formed

Abstract

Methods for forming freestanding objects primarily comprising aligned carbon nanotubes, as well as the objects made by these methods, are provided. Arrays of generally aligned carbon nanotubes are first synthesized on a substrate then released from the substrate and densified, maintaining the aligned arrangement. These densified arrays can take the form of thin strips which can be joined together, for example by lamination, to form larger objects of arbitrary size. These objects can be further cut or otherwise machined to desired dimensions and shapes. Release from the substrate can be accomplished mechanically, such as by shearing, or chemically, such as by etching. Densification can be accomplished, for example, through compaction or by taking advantage of capillary forces. In the latter case, an array is first wetted with a fluid and then dried. As the fluid is removed, capillary forces draw the nanotubes closer together.

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