Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, People's Republic of China.
Nanotechnology. 2016 Nov 11;27(45):455301. doi: 10.1088/0957-4484/27/45/455301. Epub 2016 Oct 4.
The ordering degree of nanostructures is the key to determining the uniformity of surface-enhanced Raman scattering (SERS). However, fabrication of large-area ordered nanostructures remains a challenge, especially with the ultrahigh-density (>10 cm). Here, we report a fabrication of large-area ultrahigh-density ordered Ag@AlO/Ag core-shell nanosphere (NS) arrays with tunable nanostructures. The ultrahigh-density (2.8 × 10 cm) ordered NS arrays over a large-area capability (diameter >4.0 cm) enable the uniform SERS signals with the relative standard deviation of less than 5%. The as-fabricated highly reproducible SERS substrate can be applied to detect trace phenolic pollutants in water. This work does not only provide a new route for synthesizing the ultrahigh-density ordered nanostructures, but also create a new class of SERS substrates with high sensitivity and excellent reproducibility.
纳米结构的有序度是决定表面增强拉曼散射（SERS）均匀性的关键。然而，大面积有序纳米结构的制备仍然是一个挑战，特别是在超高密度（>10 cm）的情况下。在这里，我们报告了一种具有可调纳米结构的大面积超高密度有序 Ag@AlO/Ag 核壳纳米球（NS）阵列的制备。大面积（直径>4.0 cm）上超高密度（2.8×10 cm）有序 NS 阵列使具有小于 5%相对标准偏差的均匀 SERS 信号成为可能。所制备的高度可重现的 SERS 基底可用于检测水中痕量酚类污染物。这项工作不仅为合成超高密度有序纳米结构提供了一条新途径，而且还创建了一类具有高灵敏度和出色重现性的新型 SERS 基底。
