Department of Chemistry, KAIST, Daejeon 305-701, Korea.
ACS Nano. 2010 May 25;4(5):2919-27. doi: 10.1021/nn100151c.
We report that twin-free single-crystalline Pd nanowire (NW) arrays grow epitaxially in a selected pattern on a substrate. Parallel aligned Pd NWs are synthesized on a SrTiO(3) (110) substrate in a very high density. On a SrTiO(3) (001) substrate, Pd NWs grow horizontally in two perpendicular directions. Vertical Pd NWs are synthesized instead of horizontal NWs when a c-cut sapphire substrate is employed. We reveal that the atomic structure of the substrate surface determines the geometry and orientation of seeds, which in turn direct the growth patterns of the NWs. The interface energy between the NW material and the substrate is also critical in determining the NW growth pattern. Polarization-dependent localized surface plasmon resonance of as-synthesized epitaxial Pd NW arrays is investigated for application as a plasmonic platform.
我们报告称，在基底上以选定的图案外延生长出无孪晶的单晶钯纳米线 (NW) 阵列。在 SrTiO3 (110) 衬底上以非常高的密度合成平行排列的 Pd NWs。在 SrTiO3 (001) 衬底上，Pd NWs 以两个垂直方向水平生长。当使用 c 切蓝宝石衬底时，合成的是垂直 NWs 而不是水平 NWs。我们揭示了基底表面的原子结构决定了种子的几何形状和取向，而这又反过来决定了 NW 的生长模式。NW 材料与衬底之间的界面能在确定 NW 生长模式方面也很关键。我们研究了所合成的外延 Pd NW 阵列的与偏振相关的局域表面等离激元共振，以将其用作等离子体平台。
