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Assembly and Alignment of High Packing Density Carbon Nanotube Arrays Using Lithographically Defined Microscopic Water Features
ACS Nano ( IF 15.8 ) Pub Date : 2024-03-04 , DOI: 10.1021/acsnano.3c12243 Sean M Foradori 1 , Brett Prussack 2 , Arganthaël Berson 2 , Michael S Arnold 1
ACS Nano ( IF 15.8 ) Pub Date : 2024-03-04 , DOI: 10.1021/acsnano.3c12243 Sean M Foradori 1 , Brett Prussack 2 , Arganthaël Berson 2 , Michael S Arnold 1
Affiliation
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High packing density aligned arrays of semiconducting carbon nanotubes (CNTs) are required for many electronics applications. Past work has shown that the accumulation of CNTs at a water–solvent interface can drive array self-assembly. Previously, the confining interface was a large-area, macroscopic feature. Here, we report on the CNT assembly on microscopic water features. Water microdroplets are formed on 10–100 μm wide hydrophilic stripes patterned on a substrate. Exposure to CNTs dispersed in solvent accumulates CNTs at the microdroplet–solvent interface, driving their alignment and deposition at the microdroplet–solvent–substrate contact line. Compared with macroscopic methods in which the contact line uncontrollably moves across the substrate as it is pulled out of the liquids, the hydrophilic patterns and microdroplets allow pinning of the contact line. As CNTs deposit, the contact line self-translates, allowing for dense CNT packing. We realize monolayer CNT arrays aligned within ±3.9° at density of 250 μm–1 and field effect transistors with a high current density of 1.9 mA μm–1 and transconductance of 1.2 mS μm–1 at −0.6 V drain bias and 60 nm channel length.
中文翻译：
使用光刻定义的微观水特征组装和排列高堆积密度碳纳米管阵列
许多电子应用需要高堆积密度排列的半导体碳纳米管 (CNT) 阵列。过去的工作表明，碳纳米管在水-溶剂界面上的积累可以驱动阵列自组装。以前，限制界面是大面积的宏观特征。在这里，我们报告了微观水景上的碳纳米管组装。水微滴在基材上图案化的 10-100 μm 宽的亲水条纹上形成。暴露于分散在溶剂中的碳纳米管会在微滴-溶剂界面处积聚碳纳米管，从而驱动它们在微滴-溶剂-基材接触线上的排列和沉积。与接触线从液体中拉出时不受控制地穿过基材的宏观方法相比，亲水图案和微滴允许钉扎接触线。当碳纳米管沉积时，接触线会自动平移，从而实现密集的碳纳米管堆积。我们实现了密度为 250 μm –1时在 ±3.9° 范围内排列的单层 CNT 阵列，以及在 −0.6 V 漏极偏压和 60 nm 沟道下具有 1.9 mA μm –1高电流密度和 1.2 mS μm –1跨导的场效应晶体管长度。
更新日期：2024-03-04
中文翻译：
使用光刻定义的微观水特征组装和排列高堆积密度碳纳米管阵列
许多电子应用需要高堆积密度排列的半导体碳纳米管 (CNT) 阵列。过去的工作表明，碳纳米管在水-溶剂界面上的积累可以驱动阵列自组装。以前，限制界面是大面积的宏观特征。在这里，我们报告了微观水景上的碳纳米管组装。水微滴在基材上图案化的 10-100 μm 宽的亲水条纹上形成。暴露于分散在溶剂中的碳纳米管会在微滴-溶剂界面处积聚碳纳米管，从而驱动它们在微滴-溶剂-基材接触线上的排列和沉积。与接触线从液体中拉出时不受控制地穿过基材的宏观方法相比，亲水图案和微滴允许钉扎接触线。当碳纳米管沉积时，接触线会自动平移，从而实现密集的碳纳米管堆积。我们实现了密度为 250 μm –1时在 ±3.9° 范围内排列的单层 CNT 阵列，以及在 −0.6 V 漏极偏压和 60 nm 沟道下具有 1.9 mA μm –1高电流密度和 1.2 mS μm –1跨导的场效应晶体管长度。
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