Lee Soohyun, Jung Insub, Son Jiwoong, Lee Sungwoo, Park Minsun, Kim Ji-Eun, Park Woocheol, Lee Jaewon, Nam Jwa-Min, Park Sungho
Department of Chemistry, Sungkyunkwan University (SKKU), Suwon, 16419, South Korea.
Institute of Basic Science, Sungkyunkwan University (SKKU), Suwon, 16419, South Korea.
ACS Nano. 2022 Jul 26;16(7):11259-11267. doi: 10.1021/acsnano.2c04633. Epub 2022 Jul 14.
We report a synthetic approach for heterometallic (Au-Pt-Au) nanorings with intertwined triple rings (NITs), wherein three differently sized metal circular nanorings concentrically overlap in a single entity. The synthetic method allows one to control the component of core nanorings (Au or Pt) with a tunable gap distance. The narrow circular nanogaps between inner and outer Au rings strongly enhance the electromagnetic near-field intraparticle coupling of localized surface plasmon resonance, which realizes surface-enhanced Raman scattering (SERS) at the single-particle level. Importantly, when the component of the middle ring is Pt, SERS measurement for electrochemical reactions on Pt domains could be monitored with electrochemical potential variations due to the near-field focusing that is assisted by plasmonically active inner and outer Au nanorings, which is not feasible with pure Pt nanoparticle systems. The resulting NIT systems are robust and may benefit the synthesis of complicated nanostructures, giving myriad applications.
我们报道了一种用于合成具有交织三环（NITs）的异金属（Au-Pt-Au）纳米环的方法，其中三个不同尺寸的金属圆形纳米环在单个实体中同心重叠。该合成方法允许人们通过可调的间隙距离来控制核心纳米环（Au或Pt）的成分。内、外Au环之间狭窄的圆形纳米间隙强烈增强了局域表面等离子体共振的电磁近场粒子内耦合，从而实现了单粒子水平的表面增强拉曼散射（SERS）。重要的是，当中环的成分是Pt时，由于等离子体活性内、外Au纳米环辅助的近场聚焦，可以通过电化学电位变化监测Pt域上电化学反应的SERS测量，这在纯Pt纳米颗粒系统中是不可行的。所得的NIT系统很稳定，可能有利于复杂纳米结构的合成，具有众多应用。
