Fukagawa Toshiaki, Tanaka Hiroaki, Morikawa Kouki, Tanaka Shunsuke, Hatakeyama Yoshikiyo, Hino Kazuyuki
Department of Chemistry, Faculty of Education, Aichi University of Education, 1 Hirosawa, Igaya, Kariya, Aichi 448-8542, Japan.
Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
J Phys Chem Lett. 2020 Mar 19;11(6):2086-2091. doi: 10.1021/acs.jpclett.0c00566. Epub 2020 Mar 3.
We studied the alignment changes of polymer-capped gold nanorods (GNRs@PS) under an applied electric field by visible-near-infrared absorption and small-angle X-ray scattering (SAXS) measurements. Monodispersed GNRs with an aspect ratio of 4.0 were produced by the seed-mediated growth method using cetyltrimethylammonium bromide and sodium oleate binary surfactants. We investigated the phase transition between the ordered structure of GNRs@PS induced by the external electric field. At appropriate field strengths (>3 V/μm), the SAXS profiles of GNRs@PS showed a smectic ordered structure. Increasing the electric field strength densified the ordered structure and greatly increased the Raman signals (the 298 and 445 cm bands) of the carbon tetrachloride (solvent) between the GNRs@PS. The insights gained are potentially applicable to catalysts, future displays, optical filters, and data storage devices.
我们通过可见-近红外吸收和小角X射线散射（SAXS）测量，研究了施加电场下聚合物包覆金纳米棒（GNRs@PS）的排列变化。使用十六烷基三甲基溴化铵和油酸钠二元表面活性剂，通过种子介导生长法制备了长径比为4.0的单分散GNRs。我们研究了由外部电场诱导的GNRs@PS有序结构之间的相变。在适当的场强（>3 V/μm）下，GNRs@PS的SAXS谱显示出近晶有序结构。增加电场强度使有序结构致密化，并极大地增加了GNRs@PS之间四氯化碳（溶剂）的拉曼信号（298和445 cm波段）。所获得的见解可能适用于催化剂、未来显示器、光学滤波器和数据存储设备。
