Hu Zonghai, Fischbein Michael D, Querner Claudia, Drndić Marija
Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, Pennsylvania 19104, USA.
Nano Lett. 2006 Nov;6(11):2585-91. doi: 10.1021/nl0620379.
Local electric fields generated by nanopatterned electrodes were used to control the position and orientation of well-isolated as well as closely packed colloidal semiconducting CdTe and CdSe nanorods (NRs) drop-cast from solution. Postdeposition imaging using transmission-electron microscopy and atomic-force microscopy revealed strong NR alignment to the direction of the applied field and dense accumulation around and onto voltage-biased electrodes when deposited from dilute and concentrated solutions, respectively. The degree of alignment under the applied electric field is characterized by a nematic order parameter S approximately 0.8 in contrast to the zero-field case when S approximately 0.1.
通过纳米图案化电极产生的局部电场，用于控制从溶液中滴铸的、良好隔离以及紧密堆积的胶体半导体碲化镉（CdTe）和硒化镉（CdSe）纳米棒（NRs）的位置和取向。使用透射电子显微镜和原子力显微镜进行沉积后成像显示，当分别从稀溶液和浓溶液中沉积时，纳米棒会沿着外加电场方向强烈排列，并且在电压偏置电极周围和电极上密集堆积。与零场情况（此时向列序参数S约为0.1）相比，在外加电场下的排列程度由向列序参数S约为0.8来表征。
