Au@Ag Dendritic Nanoforests for Surface-Enhanced Raman Scattering Sensing

被引：10

作者：

Huang, Hung Ji ^{[1
]}

Shiao, Ming-Hua ^{[1
]}

Lin, Yang-Wei ^{[2
]}

Lin, Bei-Ju ^{[3
]}

Su, James ^{[1
]}

Lin, Yung-Sheng ^{[3
,4
,5
]}

Chang, Han-Wei ^{[3
]}

机构：

[1] Natl Appl Res Labs, Taiwan Instrument Res Inst, Hsinchu 300092, Taiwan

[2] Natl Changhua Univ Educ, Dept Chem, Changhua 500207, Taiwan

[3] Natl United Univ, Dept Chem Engn, Miaoli 360001, Taiwan

[4] Natl United Univ, PhD Program Mat & Chem Engn, Miaoli 360001, Taiwan

[5] Natl Yang Ming Chiao Tung Univ, Inst Food Safety & Hlth Risk Assessment, Taipei 112304, Taiwan

来源：

NANOMATERIALS | 2021年 / 11卷 / 07期

关键词：

Au@Ag dendritic nanoforests; fluoride-assisted Galvanic replacement reaction; surface-enhanced Raman scattering; surface plasmons; NANOPARTICLES; OXIDATION; COLLOIDS; FACILE; HYBRID; ALLOY; H-2; NI;

D O I：

10.3390/nano11071736

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The effects of Au cores in Ag shells in enhancing surface-enhanced Raman scattering (SERS) were evaluated with samples of various Au/Ag ratios. High-density Ag shell/Au core dendritic nanoforests (Au@Ag-DNFs) on silicon (Au@Ag-DNFs/Si) were synthesized using the fluoride-assisted Galvanic replacement reaction method. The synthesized Au@Ag-DNFs/Si samples were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, reflection spectroscopy, X-ray diffraction, and Raman spectroscopy. The ultraviolet-visible extinction spectrum exhibited increased extinction induced by the addition of Ag when creating the metal DNFs layer. The pure Ag DNFs exhibited high optical extinction of visible light, but low SERS response compared with Au@Ag DNFs. The Au core (with high refractive index real part) in Au@Ag DNFs maintained a long-leaf structure that focused the illumination light, resulting in the apparent SERS enhancement of the Ag coverage.

引用

页数：14

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