具有可调谐局域表面等离子体共振的热生成金-银纳米结构作为表面增强拉曼散射活性基底。

Thermally generated Au-Ag nanostructures with tunable localized surface plasmon resonance as SERS activity substrates.

作者信息

Ji Jialin, Li Zhengwang

机构信息

Tongda College of Nanjing University of Post and Telecommunications, No. 33 South of Runyang Road, Yangzhou 225127, People's Republic of China.

Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 Jun Gong Road, Shanghai 200093, People's Republic of China.

出版信息

Heliyon. 2023 Jun 28;9(7):e17749. doi: 10.1016/j.heliyon.2023.e17749. eCollection 2023 Jul.

DOI:10.1016/j.heliyon.2023.e17749

PMID:37449172

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10336595/

Abstract

Various Au-Ag bimetallic alloy nanostructures were obtained as sensitive surface-enhanced Raman scattering (SERS) substrates by changing the thermal annealing sequence. The atomic force microscopy (AFM) and scanning electron microscopy (SEM) results confirm that Au/Ag bimetallic clusters and Ag-Au core-shell like structures can be designed by thermal annealing. The absorption spectra showed that the localized surface plasmon resonance (LSPR) frequency of the annealed Au/Ag bimetallic alloy structure could effectively shift from the near ultraviolet to the visible region. At the same time, the Au/Ag bimetallic alloy films modified by thermal annealing have shown satisfactory performance as SERS substrates. Raman enhancement mechanism of Au-Ag bimetallic alloy films is verified by finite-difference time-domain (FDTD) simulation results.

摘要

通过改变热退火顺序，获得了各种金-银双金属合金纳米结构作为灵敏的表面增强拉曼散射（SERS）基底。原子力显微镜（AFM）和扫描电子显微镜（SEM）结果证实，通过热退火可以设计出金/银双金属簇和银-金核壳状结构。吸收光谱表明，退火后的金/银双金属合金结构的局域表面等离子体共振（LSPR）频率可以有效地从近紫外区域转移到可见光区域。同时，经热退火修饰的金/银双金属合金薄膜作为SERS基底表现出令人满意的性能。有限时域差分（FDTD）模拟结果验证了金-银双金属合金薄膜的拉曼增强机制。