Dose-Controlled, Floating Evaporative Self-assembly and Alignment of Semiconducting Carbon Nanotubes from Organic Solvents

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• 作者：Yongho Joo ; Gerald J. Brady ; Michael S. Arnold ; Padma Gopalan
• 刊名：Langmuir
• 出版年：2014
• 出版时间：April 1, 2014
• 年：2014
• 卷：30
• 期：12
• 页码：3460-3466
• 全文大小：405K
• 年卷期：v.30,no.12(April 1, 2014)
• ISSN：1520-5827

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water鈥揳ir interface to deposit aligned s-SWCNT (99.9%) tubes on a partially submerged hydrophobic substrate, which is withdrawn vertically from the surface of water.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.