Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry (BK21 FOUR) and Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, South Korea.
Center for Nanotectonics, Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon, 34141, Republic of Korea.
Biosens Bioelectron. 2022 Feb 1;197:113766. doi: 10.1016/j.bios.2021.113766. Epub 2021 Nov 2.
Herein, gold nanoparticles (Au NPs) were synthesized by pulsed laser ablation (PLA) in a mixed-phase solvent of acetonitrile and water. The size of Au NPs and the number of graphitic carbon (GC) layers were controlled by varying the ratio of the solvent mixture. The surface-enhanced Raman scattering (SERS) of the Au NPs was investigated using 10 M 4-aminobenzenethiol and 10 M 4-nitrobenzenethiol as probe molecules. The SERS activity strongly depended on the nanogaps between particles owing to the formation of hot spots. In the present work, the nanogaps were controlled by changing the amount of GC layers. No GC layers were produced in water, resulting low SERS intensity. In contrast, Au NPs prepared in 30 vol% of acetonitrile showed significant SERS enhancement, which was attributed to the optimal size of the GC-coated NPs and a reasonable gap between them. The obtained results revealed that Au NPs produced by PLA in liquid could be applied in SERS-based microsensors.
本文采用脉冲激光烧蚀（PLA）在乙腈和水的混合相溶剂中合成了金纳米粒子（Au NPs）。通过改变溶剂混合物的比例来控制 Au NPs 的尺寸和石墨碳（GC）层数的数量。使用 10 M 4-氨基苯硫醇和 10 M 4-硝基苯硫醇作为探针分子研究了 Au NPs 的表面增强拉曼散射（SERS）。由于热点的形成，SERS 活性强烈依赖于颗粒之间的纳米间隙。在本工作中，通过改变 GC 层的数量来控制纳米间隙。在水中不生成 GC 层，导致 SERS 强度低。相比之下，在 30 vol%乙腈中制备的 Au NPs 表现出显著的 SERS 增强，这归因于 GC 包覆的 NPs 的最佳尺寸和它们之间的合理间隙。所得结果表明，通过 PLA 在液体中制备的 Au NPs 可应用于基于 SERS 的微传感器。
