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Efforts aimed at large-scale integration of nanoelectronic devices thatexploit the superior electronic and mechanical properties of single-walledcarbon nanotubes (SWCNTs) remain limited by the difficulties associated withmanipulation and packaging of individual SWNTs. Alternative approaches based onultra-thin carbon nanotube networks (CNNs) have enjoyed success of late withthe realization of several scalable device applications. However, precisecontrol over the network electronic transport is challenging due to i) an oftenuncontrollable interplay between network coverage and its topology and ii) theinherent electrical heterogeneity of the constituent SWNTs. In this letter, weuse template-assisted fluidic assembly of SWCNT networks to explore the effectof geometric confinement on the network topology. Heterogeneous SWCNT networksdip-coated onto sub-micron wide ultra-thin polymer channels exhibit a topologythat becomes increasingly aligned with decreasing channel width and thickness.Experimental scale coarse-grained computations of interacting SWCNTs show thatthe effect is a reflection of an aligned topology that is no longer dependenton the network density, which in turn emerges as a robust knob that can inducesemiconductor-to-metallic transitions in the network response. Our studydemonstrates the effectiveness of directed assembly on channels with varyingdegrees of confinement as a simple tool to tailor the conductance of theotherwise heterogeneous network, opening up the possibility of robustlarge-scale CNN-based devices.

Topological transitions in carbon nanotube networks via nanoscale confinement