Department of Chemistry, KAIST, Daejeon 305-701, Korea.
Chem Asian J. 2011 Sep 5;6(9):2500-5. doi: 10.1002/asia.201100028. Epub 2011 May 18.
Epitaxial Pt nanowire (NW) arrays are synthesized for the first time by a chemical vapor transport method by using a metal halide as a precursor. Here we report that the epitaxial growth direction of NWs can be steered by seed crystal morphology. Octahedral seeds grow into inclined NWs possessing six growth directions, whereas half-octahedral seeds grow into vertical and horizontal NWs. Interfacial energies between the seed material and the substrate are critical in determining the morphology of seed crystals. We also demonstrate that non-SERS-active Pt NWs can show strong surface-enhanced Raman scattering (SERS) spectra by placing them on Ag films. The active SERS observation would help to elucidate platinum-catalyzed chemical reactions.
首次采用金属卤化物作为前驱体，通过化学气相输运方法合成了外延 Pt 纳米线（NW）阵列。在这里，我们报告说 NW 的外延生长方向可以通过种子晶体形态来控制。八面体种子生长成具有六个生长方向的倾斜 NW，而半八面体种子生长成垂直和水平 NW。种子材料和衬底之间的界面能在确定种子晶体的形态方面起着关键作用。我们还证明，通过将非 SERS 活性 Pt NW 放置在 Ag 薄膜上，它们可以显示出强的表面增强拉曼散射（SERS）光谱。活性 SERS 观察将有助于阐明铂催化的化学反应。
