An Di, Shen Yan, Wen Jinxiu, Zheng Zebo, Chen Jun, She Juncong, Chen Huanjun, Deng Shaozhi, Xu Ningsheng
State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, 510275 People's Republic of China.
Nanomicro Lett. 2017;9(1):2. doi: 10.1007/s40820-016-0104-6. Epub 2016 Aug 31.
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.
Mo nanoscrews are for the first time cultivated as a novel type of SERS substrate. The SERS activity is originated from the electromagnetic field enhancements on the individual Mo nanoscrew, which is corroborated by single-particle optical characterizations.
首次将钼纳米螺旋体培育为一种用于表面增强拉曼散射（SERS）的新型非货币金属基底。发现该纳米螺旋体由许多沿其长度方向堆叠且间距较小的小螺纹组成。在外部光激发下，间隙内引发了强烈的电磁耦合，纳米螺旋体表面形成了许多热点，这通过高分辨率扫描近场光学显微镜测量和使用有限元方法的数值模拟得到了证实。这些热点是纳米螺旋体观察到的SERS活性的原因。拉曼映射表征进一步揭示了SERS活性的优异再现性。我们的发现可能为低成本和稳定的SERS基底的设计铺平道路。
首次将钼纳米螺旋体培育为一种新型SERS基底。SERS活性源于单个钼纳米螺旋体上的电磁场增强，这通过单粒子光学表征得到了证实。
