Fabrication of ordered carbon nanotube structures by unconventional lithography

Pierpaolo Greco, Massimo Facchini, Massimiliano Cavallini, Giampiero Ruani, Chiara Dionigi and Fabio Biscarini

Phys. Status Solidi B 2010, 247(4), 877–883.

Abstract:

We use stamp-assisted deposition to align single-walled carbon nanotubes (CNTs) starting from a water suspension of CNTs in sodium dodecyl sulphate (SDS) solution. The driving force of the process is the interplay between capillary flow and spatial confinement, which leads CNTs to self-organize into bundles aligned in rows hundreds of micrometres long. Lithographically controlled wetting, where the solution is confined in menisci pinned to the stamp protrusions, yields patterns with feature size as small as single nanotubes. Using micromolding in capillaries instead we fabricate patterns of CNTs lines, with nanometric size, preferentially aligned along the microchannel axis and exhibiting a conductivity of about 100 S/cm.