Creating patterned carbon nanotube catalysts through the microcontact printing of block copolymer micellar thin films
Creating patterned carbon nanotube catalysts through the microcontact printing of block copolymer micellar thin films
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DOI：
10.1021/la061054a
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发表时间：
2006-09-26
期刊：
影响因子：
3.9
通讯作者：
Cohen, Robert E.
中科院分区：
文献类型：
--
作者：
Bennett, Ryan D.;Hart, Anastasios J.;Cohen, Robert E.
我们报道了一种合成图案化碳纳米管（CNT）催化剂的路线，通过微接触印刷的铁负载聚（苯乙烯-嵌段-丙烯酸）（PS-b-PAA）胶束溶液到硅晶片上涂有薄的氧化铝（Al 2 O3）层。两亲性嵌段共聚物PS-b-PAA在甲苯中形成球形胶束，当沉积到基底上时，其可以在PS基质内形成球形PAA域的准六边形阵列。在这份报告中，我们浸聚（二甲基硅氧烷）（PDMS）模压邮票到铁负载胶束溶液中创建一个薄膜上的PDMS功能。然后使PDMS印模与基底接触，并施加单轴压缩应力以将胶束薄膜以限定的图案从PDMS印模转移到基底上。然后通过氧等离子体蚀刻去除聚合物，以在基底上留下图案化的氧化铁纳米团簇阵列。使用这些催化剂，我们实现了图案化的多壁碳纳米管的垂直生长，其中碳纳米管保持图案化的催化剂的保真度，形成高纵横比的站立结构。
We report a route for synthesizing patterned carbon nanotube (CNT) catalysts through the microcontact printing of iron-loaded poly(styrene-block-acrylic acid) (PS-b-PAA) micellar solutions onto silicon wafers coated with thin aluminum oxide (Al2O3) layers. The amphiphilic block copolymer, PS-b-PAA, forms spherical micelles in toluene that can form quasi-hexagonal arrays of spherical PAA domains within a PS matrix when deposited onto a substrate. In this report, we dip a poly(dimethylsiloxane) (PDMS) molded stamp into an iron-loaded micellar solution to create a thin film on the PDMS features. The PDMS stamp is then put in contact with a substrate, and uniaxial compressive stress is applied to transfer the micellar thin film from the PDMS stamp onto the substrate in a defined pattern. The polymer is then removed by oxygen plasma etching to leave a patterned iron oxide nanocluster array on the substrate. Using these catalysts, we achieve patterned vertical growth of multiwalled CNTs, where the CNTs maintain the fidelity of the patterned catalyst, forming high-aspect-ratio standing structures.