Molybdenum Nanoscrews: A Novel Non-coinage-Metal Substrate for Surface-Enhanced Raman Scattering
Molybdenum Nanoscrews: A Novel Non-coinage-Metal Substrate for Surface-Enhanced Raman Scattering
复制标题
钼纳米螺钉：一种用于表面增强拉曼散射的非造币金属基底
DOI：
10.1007/s40820-016-0104-6
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发表时间：
2017-01-01
影响因子：
26.6
通讯作者：
Xu, Ningsheng
中科院分区：
文献类型：
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作者：
An, Di;Shen, Yan;Xu, Ningsheng
首次将钼纳米螺旋作为一种新型的非硬币金属衬底用于表面增强拉曼散射(SERS)。研究发现，纳米螺杆是由许多沿其长度方向堆积的小螺纹线组成的，螺纹间的距离很小。通过高分辨率扫描近场光学显微镜测量和有限元数值模拟，证实了在外部光激励下，缝隙内发生了强烈的电磁耦合，并在纳米螺杆表面形成了许多热点。这些热点是观察到的纳米螺旋的SERS活动的原因。拉曼图谱分析进一步揭示了SERS活性的良好重复性。我们的发现可能为设计低成本和稳定的SERS衬底铺平道路。
For the first time, Mo nanoscrew was cultivated as a novel non-coinage-metal substrate for surface-enhanced Raman scattering (SERS). It was found that the nanoscrew is composed of many small screw threads stacking along its length direction with small separations. Under external light excitation, strong electromagnetic coupling was initiated within the gaps, and many hot-spots formed on the surface of the nanoscrew, which was confirmed by high-resolution scanning near-field optical microscope measurements and numerical simulations using finite element method. These hot-spots are responsible for the observed SERS activity of the nanoscrews. Raman mapping characterizations further revealed the excellent reproducibility of the SERS activity. Our findings may pave the way for design of low-cost and stable SERS substrates.