文摘
Arrays of aligned semiconducting single-walled carbon nanotubes (s-SWCNTs) with exceptional electronic-type purity were deposited at high deposition velocity of 5 mm min鈥? by a novel 鈥渄ose-controlled, floating evaporative self-assembly鈥?process with excellent control over the placement of stripes and quantity of s-SWCNTs deposited. This approach uses the diffusion of organic solvent on the water鈥揳ir interface to deposit aligned s-SWCNT (99.9%) tubes on a partially submerged hydrophobic substrate, which is withdrawn vertically from the surface of water. By decoupling the s-SWCNT stripe formation from the evaporation of the bulk solution and by iteratively applying the s-SWCNTs in controlled 鈥渄oses鈥? we show through polarized Raman studies that the s-SWCNTs are aligned within 卤14掳, are packed at a density of 50 s-SWCNTs 渭m鈥?, and constitute primarily a well-ordered monodispersed layer. The resulting field-effect transistor devices show high performance with a mobility of 38 cm2 V鈥? s鈥? and on/off ratio of 2.2 脳 106 at 9 渭m channel length.