Using block copolymer micellar thin films as templates for the production of catalysts for carbon nanotube growth
Using block copolymer micellar thin films as templates for the production of catalysts for carbon nanotube growth
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DOI：
10.1021/cm048992l
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发表时间：
2004-12-28
影响因子：
8.6
通讯作者：
Cohen, RE
中科院分区：
文献类型：
--
作者：
Bennett, RD;Xiong, GY;Cohen, RE
我们报告了一种新方法，该方法使用嵌段共聚物胶束作为创建大面积含铁纳米团簇阵列的手段，能够催化碳纳米管（CNT）的生长。两亲性嵌段共聚物聚（苯乙烯-嵌段-丙烯酸）（PS-b-PAA）在溶液中形成胶束，能够在表面自组织成有序结构。通过将这些溶液旋涂到各种基材上。我们可以创造。 PS 矩阵内 PAA 球体的准六边形阵列。 PAA 结构域中的羧酸基团可用于离子交换方案中，以选择性地螯合铁离子。这会产生尺寸接近单分散（直径类似于 8 nm）的含铁纳米团簇，并以每 cm(2) 约 10(11) 个颗粒的密度形成图案。原则上，这种合成含铁纳米团簇的路线提供了通过改变嵌段共聚物的分子量来控制团簇尺寸和间距的能力。在此。报告中，我们展示了这些嵌段共聚物模板化的含铁纳米团簇阵列在热化学气相沉积（CVD）过程中催化碳纳米管生长的能力。我们展示了仍附着在生长基底上的生长时 CNT 的透射电子显微镜 (TEM) 和扫描电子显微镜 (SEM) 图像，这使我们能够表征 CVD 生长后的 CNT 和催化纳米团簇。
We report a novel approach that uses block copolymer micelles as a means to create large area arrays of iron-containing nanoclusters capable of catalyzing the growth of carbon nanotubes (CNTs). The amphiphilic block copolymer poly(styrene-block-acrylic acid) (PS-b-PAA) forms micelles in solution which are capable of self-organizing into ordered structures on surfaces. By spin-coating these solutions onto a variety of substrates. we can create. quasi-hexagonal arrays of PAA spheres within a PS matrix. The carboxylic acids groups in the PAA domains can be utilized in an ion-exchange protocol to selectively sequester iron ions.. which results in iron-containing nanoclusters that are nearly monodisperse in size (diameter similar to8 nm) and patterned at a density of approximately 10(11) particles per cm(2) . In principle, this route for synthesizing iron-containing nanoclusters offers the capability of controlling the cluster size and spacing by altering the molecular weight of the block copolymer. In this. report, we demonstrate the ability of these block-copolymer-templated iron-containing nanocluster arrays to catalyze the growth of CNTs in a thermal chemical vapor deposition (CVD) process. We present transmission electron microscope (TEM) and scanning electron microscope (SEM) images of the as-grown CNTs still attached to their growth Substrate, which allows us to characterize both the CNTs and the catalytic nanoclusters after CVD growth.