Fabrication of low bundle concentration carbon nanotube network film

Abstract

We presented here, a method to fabricate low density single-walled carbon nano tube(SWCNT) network films which have low bundle concentration with no catalyst particles and less impurities. We immerged an anodic aluminum oxide(AAO) membrane, which has pores with average diameter 0.02um, into the well dispersed SWCNTs suspension in a bottle, which was then bathsonicated at a power of 20W. The suspended CNTs were trapped by AAO membrane pores during the sonication. The density of SWCNTs forming the network was controlled by the density of SWCNT suspension and the sonication time. Scanning electron microscope(SEM) was used to evaluate the density of SWCNT films. We also measured the electric properties of thin film transistors fabricated using the SWCNT network films.