College of Materials, Xiamen University, Xiamen 361005, P. R. China.
Nanoscale. 2012 Jan 7;4(1):278-83. doi: 10.1039/c1nr11191d. Epub 2011 Nov 14.
Multi-level carbon nanotube (CNT) arrays with adjustable patterns were prepared by a combination of the breath figure (BF) process and chemical vapor deposition. Polystyrene-b-poly(acrylic acid)/ferrocene was dissolved in carbon disulfide and cast onto a Si substrate covered with a transmission electron microscope grid in saturated relative humidity. A two-level microporous hybrid film with a block copolymer skeleton formed on the substrate after evaporation of the organic solvent and water. One level of ordered surface features originates from the contour of the hard templates; while the other level originates from the condensation of water droplets (BF arrays). Ultraviolet irradiation effectively cross-linked the polymer matrix and endowed the hybrid film with improved thermal stability. In the subsequent pyrolysis, the incorporated ferrocene in the hybrid film was oxidized and turned the polymer skeleton into the ferrous inorganic micropatterns. Either the cross-linked hybrid film or the ferrous inorganic micropatterns could act as a template to grow the multi-level CNT patterns, e.g. isolated and honeycomb-structured CNT bundle arrays perpendicular to the substrate.
采用呼吸图案（BF）工艺和化学气相沉积相结合的方法制备了具有可调图案的多层碳纳米管（CNT）阵列。聚苯乙烯-b-聚（丙烯酸）/二茂铁溶于二硫化碳中，浇铸在涂有透射电子显微镜网格的 Si 衬底上，在饱和相对湿度下。有机溶剂和水蒸发后，在基底上形成具有嵌段共聚物骨架的两级微孔杂化膜。一个有序的表面特征来自硬模板的轮廓；而另一个水平则来自于水滴的凝结（BF 阵列）。紫外光有效地交联了聚合物基体，赋予了杂化膜更好的热稳定性。在随后的热解中，杂化膜中的二茂铁被氧化，使聚合物骨架转化为亚铁无机微孔图案。交联杂化膜或亚铁无机微孔图案都可以作为模板来生长多层 CNT 图案，例如与基底垂直的隔离和蜂窝状结构的 CNT 束阵列。
