Key Laboratory of Materials Physics, CAS Center for Excellence in Nanoscience and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui, 230031, People's Republic of China.
Nanotechnology. 2016 Sep 23;27(38):384001. doi: 10.1088/0957-4484/27/38/384001. Epub 2016 Aug 16.
An ordered array of hierarchically-structured core-nanosphere@space-layer@shell-nanoparticles has been fabricated for surface-enhanced Raman scattering (SERS) detection. To fabricate this hierarchically-structured chip, a long-range ordered array of Au/Ag-nanospheres is first patterned in the nano-bowls on the planar surface of ordered nanoporous anodic titanium oxide template. A ultra-thin alumina middle space-layer is then conformally coated on the Au/Ag-nanospheres, and Ag-nanoparticles are finally deposited on the surface of the alumina space-layer to form an ordered array of Au/Ag-nanosphere@Al2O3-layer@Ag-nanoparticles. Finite-difference time-domain simulation shows that SERS hot spots are created between the neighboring Ag-nanoparticles. The ordered array of hierarchical nanostructures is used as the SERS-substrate for a trial detection of methyl parathion (a pesticide) in water and a limit of detection of 1 nM is reached, indicating its promising potential in rapid monitoring of organic pollutants in aquatic environment.
已制备出具有有序层次结构的核-纳米球@空间层@壳-纳米粒子阵列，用于表面增强拉曼散射（SERS）检测。为了制备这种具有层次结构的芯片，首先在有序纳米多孔阳极氧化钛模板的纳米碗上图案化 Au/Ag-纳米球的长程有序阵列。然后在 Au/Ag-纳米球上形成超薄氧化铝中间空间层，最后在氧化铝空间层的表面上沉积 Ag 纳米粒子，形成有序的 Au/Ag-纳米球@Al2O3 层@Ag 纳米粒子阵列。有限差分时域模拟表明，在相邻的 Ag 纳米粒子之间产生了 SERS 热点。有序的层次结构阵列被用作 SERS 基底，用于水中甲基对硫磷（一种农药）的试验检测，达到了 1 nM 的检测限，表明其在快速监测水环境污染中的有机污染物方面具有广阔的应用前景。
