title: Nanoring Arrays on Fe Coated Substrate: Formation and Guidance for the Growth of Hierarchical CNTs.
abstract: In this article, we report the formation of nanoring structures on Fe coated substrate and their application in guiding the growth of carbon nanotube (CNT) patterns with hierarchical structures. The formation of nanorings involves the etching of polystyrene (PS) monolayer colloidal crystals (MCCs) under reactive ion etching (RIE), and the redeposition and cross-linkage of the active degradation products at the contact line between the MCCs and the substrate. After washing out the MCCs, insoluble nanorings with hexagonal order on the substrate are developed. The RIE process can control the morphology of the nanorings, as well as the distribution of the Fe element on the substrate; thus, a continuous Fe layer and separated Fe discs on the substrate are created on substrate after washing, depending on the etching time and the shield of MCCs. The surviving Fe element can work as the catalyst to initiate the in situ growth of aligned CNTs in the following chemical vapor deposition (CVD) process, while the Fe element underneath the nanorings keep its inactivity. Eventually, CNT patterns with hierarchical structures are formed. One level originates from the surviving Fe layer; the other level is templated from the nanoring structures, which cause the blank area in the CNT bundles.
authors.affiliation: College of Materials, Xiamen University , Xiamen 361005, China.
authors.forename: Tianchan
authors.initials: T
authors.lastname: Luo
authors.affiliation: College of Materials, Xiamen University , Xiamen 361005, China.
authors.forename: Can
authors.initials: C
authors.lastname: Du
authors.affiliation: College of Materials, Xiamen University , Xiamen 361005, China.
authors.forename: Aijuan
authors.initials: A
authors.lastname: Zhang
authors.affiliation: College of Materials, Xiamen University , Xiamen 361005, China.
authors.forename: Laisen
authors.initials: L
authors.lastname: Wang
authors.affiliation: College of Materials, Xiamen University , Xiamen 361005, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Bai
authors.affiliation: College of Materials, Xiamen University , Xiamen 361005, China.|State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Li