Langmuir blodgett assembly of densely aligned single walled carbon nanotubes from bulk materials

TL;DR

This paper presents a Langmuir Blodgett technique to create densely packed, aligned single-walled carbon nanotube monolayers suitable for high-performance nanoelectronic devices, overcoming previous assembly challenges.

Contribution

Developed a novel Langmuir Blodgett method with polymer functionalization for large-scale, aligned SWNT monolayer assembly with dense packing and high stability.

Findings

Achieved monolayers of aligned SWNTs with dense packing.

Demonstrated high current density of 3mA in device regions.

Enabled patterning for device integration.

Abstract

Single walled carbon nanotubes exhibit advanced electrical and surface properties useful for high performance nanoelectronics. Important to future manufacturing of nanotube circuits is large scale assembly of SWNTs into aligned forms. Despite progress in assembly and oriented synthesis, pristine SWNTs in aligned and close-packed form remain elusive and needed for high current, speed and density devices through collective operations of parallel SWNTs. Here, we develop a Langmuir Blodgett method achieving monolayers of aligned SWNTs with dense packing, central to which is a non covalent polymer functionalization by PmPV imparting high solubility and stability of SWNTs in an organic solvent DCE. Pressure cycling or annealing during LB film compression reduces hysteresis and facilitates high degree alignment and packing of SWNTs characterized by microscopy and polarized Raman spectroscopy. The monolayer SWNTs are readily patterned for device integration by microfabrication, enabling the highest currents 3mA through the narrowest regions packed with aligned SWNTs thus far.