调控双壳层金/银纳米盒的内部纳米间隙以实现表面增强拉曼散射

Zhang Weiqing, Rahmani Mohsen, Niu Wenxin, Ravaine Serge, Hong Minghui, Lu Xianmao

Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585.

Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576.

Sci Rep. 2015 Feb 11;5:8382. doi: 10.1038/srep08382.

Double-shelled Au/Ag hollow nanoboxes with precisely controlled interior nanogaps (1 to 16 nm) were synthesized for gap-tunable surface-enhanced Raman scattering (SERS). The double-shelled nanoboxes were prepared via a two-step galvanic replacement reaction approach using Ag nanocubes as the templates, while 4-aminothiolphenol (4-ATP) as SERS probe molecules were loaded between the two shells. More than 10-fold enhancement of SERS is observed from the double-shelled nanoboxes than Ag nanocubes. In addition, the SERS of the double-shelled nanoboxes increase significantly with the decrease of gap size, consistent with the theoretical prediction that smaller gap size induces larger localized electromagnetic enhancement.

合成了具有精确控制内部纳米间隙（1至16纳米）的双壳Au/Ag中空纳米盒，用于可调谐间隙表面增强拉曼散射（SERS）。以Ag纳米立方体为模板，通过两步电置换反应法制备双壳纳米盒，同时将4-氨基硫酚（4-ATP）作为SERS探针分子负载在两层壳之间。观察到双壳纳米盒的SERS比Ag纳米立方体增强了10倍以上。此外，双壳纳米盒的SERS随着间隙尺寸的减小而显著增加，这与较小间隙尺寸会诱导更大局部电磁增强的理论预测一致。