Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, P. R. China.
Nanoscale. 2012 Sep 7;4(17):5348-55. doi: 10.1039/c2nr30736g. Epub 2012 Jun 8.
Gold nanorods (AuNRs) can be successfully co-assembled with Ag nanowires (AgNWs) to form a kind of AuNR-AgNW nanocomposite by electrostatic attraction, in which the AuNRs are arranged along the long axial direction of the AgNWs with a preferential string-like alignment. The assembled AuNR-AgNW nanocomposites are then further embedded within polyvinyl alcohol (PVA) nanofibers by electrospinning, by which both AuNRs and AgNWs can be stabilized and arranged along the axis of polymer nanofibers. When the polymer nanofibers are aligned by collecting on a copper mesh with a woven structure, the AuNR-AgNW nanocomposites assembled within the electrospun nanofibers are also arranged. The influences of the AuNR-AgNW assemblies with different amounts of AuNRs attached on AgNWs on the optical properties and surface enhanced Raman scattering (SERS) enhancement have been investigated. The resulting AuNR-AgNW/PVA electrospun mats show red-shifted and broader absorption bands and higher SERS performances compared with the normal casting films with randomly dispersed AuNRs and AgNWs, or electrospun mats with monometallic components, due to the order alignment of AuNR-AgNW nanocomposites on a large scale.
金纳米棒（AuNRs）可以通过静电吸引与银纳米线（AgNWs）成功共组装，形成一种 AuNR-AgNW 纳米复合材料，其中 AuNRs 沿着 AgNWs 的长轴方向排列，具有优先的线状排列。然后，通过静电纺丝将组装的 AuNR-AgNW 纳米复合材料进一步嵌入聚乙烯醇（PVA）纳米纤维中，其中 AuNRs 和 AgNWs 可以稳定并沿着聚合物纳米纤维的轴排列。当聚合物纳米纤维通过收集在具有编织结构的铜网上对齐时，嵌入电纺纳米纤维中的 AuNR-AgNW 纳米复合材料也会排列。研究了附着在 AgNWs 上不同数量 AuNRs 的 AuNR-AgNW 组装体对光学性质和表面增强拉曼散射（SERS）增强的影响。与随机分散的 AuNRs 和 AgNWs 的普通浇铸薄膜或具有单金属成分的电纺纤维相比，由于 AuNR-AgNW 纳米复合材料在大规模上的有序排列，所得的 AuNR-AgNW/PVA 静电纺丝垫显示出红移和更宽的吸收带以及更高的 SERS 性能。
