Key Laboratory of Materials Physics, CAS Center for Excellence in Nanoscience, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. College of Chemistry & Chemical Engineering, and Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, People's Republic of China.
Nanotechnology. 2020 May 15;31(20):205303. doi: 10.1088/1361-6528/ab7100. Epub 2020 Jan 28.
It is of great significance to develop a simple and effective method for constructing large-scale high-quality surface-enhanced Raman scattering (SERS) substrate. Here, an Ag nanoparticle-assembled micro-bowl array was prepared by a close-packed polystyrene (PS) sphere monolayer templated electrodeposition approach. The fabricated Ag nanoparticle-assembled micro-bowl array shows high SERS sensitivity to rhodamine 6G (R6G) under an ultra-low concentration of 1 fM, and exhibits excellent SERS spectral uniformity with a small relative standard deviation (RSD) of 7.6% and good reproducibility (a RSD ∼8.2% for the average peak intensities from different batches of SERS substrates). The fabricated micro-bowl array SERS substrate was employed to detect pesticide residue (thiram and methyl parathion) on vegetables. The limit of detections (LODs) for the two pesticides are lower than the maximum residue limits (MRLs) set by the European Union respectively, showing promising application in rapid inspection of food safety.
开发一种简单有效的方法来构建大规模高质量的表面增强拉曼散射 (SERS) 基底具有重要意义。在这里，采用紧密堆积的聚苯乙烯 (PS) 球单层模板电沉积方法制备了 Ag 纳米粒子组装的微碗阵列。所制备的 Ag 纳米粒子组装的微碗阵列在超低浓度 1 fM 下对罗丹明 6G (R6G) 表现出高 SERS 灵敏度，并且具有出色的 SERS 光谱均匀性，相对标准偏差 (RSD) 较小，为 7.6%，重现性好 (不同批次 SERS 基底的平均峰强度的 RSD 约为 8.2%)。所制备的微碗阵列 SERS 基底用于检测蔬菜上的农药残留 (福美双和甲基对硫磷)。两种农药的检出限 (LOD) 均低于欧盟设定的最大残留限量 (MRL)，在食品安全的快速检测中具有广阔的应用前景。
