MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi'an Jiaotong University, Shann Xi, 710049, People's Republic of China.
Nano Lett. 2010 Dec 8;10(12):5006-13. doi: 10.1021/nl103161q. Epub 2010 Nov 19.
We report a facile particle mediated aggregation protocol to synthesize "sea urchin"-like gold mesoparticles with tailored surface topography via a secondary nucleation and growth process. Surprisingly, these multitip Au mesoparticles are capable of self-assembling into monolayer or multiple layer arrays on Si substrates with a convincing reproducibility and homogeneity over large areas. Raman measurements show that these individual sea urchin-like multitipped gold mesoparticles exhibit a high enhancement of surface-enhanced Raman scattering (SERS). In addition, the sea urchin-like mesoparticle arrays display a further enhancement of SERS by 1 or 2 orders of magnitude over the individual mesoparticle due to the formation of additional hot spots between the particles. The current protocol stands out as a potentially interesting approach for the fabrication of technologically important SERS-based sensors.
我们报告了一种简便的颗粒介导聚集方法，通过二次成核和生长过程，用定制的表面形貌合成“海胆”状金介孔颗粒。令人惊讶的是，这些多尖端 Au 介孔颗粒能够在 Si 衬底上自组装成单层或多层阵列，在大面积上具有令人信服的重现性和均一性。拉曼测量表明，这些单个的海胆状多尖端金介孔颗粒表现出高的表面增强拉曼散射（SERS）增强。此外，由于颗粒之间形成了额外的热点，海胆状介孔颗粒阵列的 SERS 增强比单个介孔颗粒高出 1 到 2 个数量级。该方法在制造基于 SERS 的技术上重要的传感器方面是一种很有前途的方法。
