Kubo Shoichi, Taguchi Rei, Hadano Shingo, Narita Mamiko, Watanabe Osamu, Iyoda Tomokazu, Nakagawa Masaru
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
ACS Appl Mater Interfaces. 2014 Jan 22;6(2):811-8. doi: 10.1021/am404451z. Epub 2013 Dec 27.
Inorganic semiconductor nanorods are regarded as the primary components of optical and electrical nanoscale devices. In this paper, we demonstrate the unidirectional alignment of monolayered and dispersed ZnO nanorods on a rubbed polyimide alignment layer, which was achieved by a conventional liquid crystal alignment technique. The outermost surfaces of the ZnO nanorods (average diameter 7 nm; length 50 nm) were modified by polymerization initiator moieties, and nematic liquid crystalline (LC) methacrylate polymers were grown by atom transfer radical polymerization. By regulating the densities of the polymerization initiator moieties, we successfully hybridized LC-polymer-grafted ZnO nanorods and small nematic LC molecules. The LC-polymer-modified ZnO nanorods were hierarchically aligned on the substrate via cooperative molecular interactions among the liquid crystal mesogens, which induced molecular orientation on the rubbed polyimide alignment layer.
无机半导体纳米棒被视为光学和电学纳米级器件的主要组件。在本文中，我们展示了单层且分散的ZnO纳米棒在经摩擦处理的聚酰亚胺取向层上的单向排列，这是通过传统的液晶取向技术实现的。ZnO纳米棒（平均直径7纳米；长度50纳米）的最外表面通过聚合引发剂部分进行了改性，向列型液晶（LC）甲基丙烯酸酯聚合物通过原子转移自由基聚合生长而成。通过调节聚合引发剂部分的密度，我们成功地使接枝了LC聚合物的ZnO纳米棒与小分子向列型LC分子杂化。经LC聚合物改性的ZnO纳米棒通过液晶介晶之间的协同分子相互作用在基板上分层排列，这种相互作用在经摩擦处理的聚酰亚胺取向层上诱导了分子取向。
