  Among a variety of solution-based approaches to fabricate anisotropic films
of aligned carbon nanotubes (CNTs), we focus on the dielectrophoretic assembly
method using AC electric fields in DNA-stabilized CNT suspensions. We
demonstrate that a one-stop manufacturing system using electrode needles can
draw anisotropic DNA-CNT hybrid films of 10-100 $\mu$m in size (i.e.,
free-standing DNA-CNT micro-cloths) from the remaining suspension into the
atmosphere while maintaining structural order. It has been found that a maximal
degree of polarization (ca. 40 \%) can be achieved by micro-cloths fabricated
from a variety of DNA-CNT mixtures. Our results suggest that the one-stop
method can impart biocompatibility to the downsized CNT films and that the
DNA-stabilized CNT micro-cloths directly connected to an electrode could be
useful for biofuel cells in terms of electron transfer and/or enzymatic
activity.
