Kim Jeongwon, Yoo Sungjae, Kim Jae-Myoung, Choi Sungwoo, Kim Juri, Park So-Jung, Park Doojae, Nam Jwa-Min, Park Sungho
Department of Chemistry, Sungkyunkwan University, Suwon 16419, South Korea.
Department of Chemistry, Seoul National University, Seoul 08826, South Korea.
Nano Lett. 2020 Jun 10;20(6):4362-4369. doi: 10.1021/acs.nanolett.0c01084. Epub 2020 May 11.
Herein, plasmonic metal tripod nanoframes with three-fold symmetry were synthesized in a high yield (∼83%), and their electric field distribution and single-particle surface-enhanced Raman scattering (SERS) were studied. We realized such complex frame morphology by synthesizing analogous tripod nanoframes through multiple transformations. The precise control of the Au growth pattern led to uniform tripod nanoframes embedded with circle or line-shaped hot spots. The linear-shaped nanogaps ("Y"-shaped hot-zone) of the frame structures can strongly and efficiently confine the electric field, allowing for strong SERS signals. Coupled with a high synthetic yield of the targeted frame structure, strong and uniform SERS signals were obtained inside the nanoframe gaps. Remarkably, quite reproducible SERS signals were obtained with these structures-the SERS enhancement factors with an average value of 7.9 × 10 with a distribution of enhancement factors from 2.2 × 10 to 2.2 × 10 for 45 measured individual particles.
在此，我们以高产率（约83%）合成了具有三重对称性的等离子体金属三脚架纳米框架，并研究了它们的电场分布和单粒子表面增强拉曼散射（SERS）。我们通过多次变换合成类似的三脚架纳米框架，实现了这种复杂的框架形态。对金生长模式的精确控制导致了嵌入圆形或线形热点的均匀三脚架纳米框架。框架结构的线形纳米间隙（“Y”形热点区域）能够强烈且有效地限制电场，从而产生强烈的SERS信号。再加上目标框架结构的高合成产率，在纳米框架间隙内获得了强烈且均匀的SERS信号。值得注意的是，这些结构获得了相当可重复的SERS信号——对于45个测量的单个粒子，SERS增强因子的平均值为7.9×10，增强因子分布在2.2×10至2.2×10之间。
