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题名: Multifunctional Fe3O4@SiO2-Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes
作者: Sun, Zhenli; Du, Jingling; Yan, Li; Chen, Shu; Yang, Zhilin; Jing, Chuanyong
刊名: ACS APPLIED MATERIALS & INTERFACES
出版日期: 2016-02-10
卷号: 8, 期号:5, 页码:3056-3062
关键词: SERS ; tunable gap ; selective detection ; food dye ; charge transfer
DOI: 10.1021/acsami.5b10230
部门归属: 环境化学与生态毒理学国家重点实验室
英文摘要: Nanofabrication of multifunctional surface-enhanced Raman scattering (SERS) substrates is strongly desirable but currently remains a challenge. The motivation of this study was to design such a substrate, a versatile core satellite Fe3O4@SiO2 Au (FA) hetero-nanostructure, and demonstrate its use for charge selective detection of food dye molecules as an exemplary application. Our experimental results and three-dimensional finite difference time domain (FDTD) simulation suggest that tuning the Au nanoparticle (NP) gap to sub-10 nm, which could be readily accomplished, substantially enhanced the Ronan signals. Further layer-by-layer deposition of a charged polyelectrolyte on this magnetic SERS substrate induced active adsorption and selective detection of food dye molecules of opposite charge on the substrates. Molecular dynamics (MD) simulations suggest that the selective SERS enhancement could be attributed to the high affinity and close contact (within a 20 angstrom range) between the substrate and molecules. Density function theory (DFT) calculations confirm the charge transfer from food dye molecules to Au NPs -via the polyelectrolytes. This multifunctional SERS platform provides easy separation and selective detection of charged molecules from complex chemical mixtures.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35903
Appears in Collections:环境化学与生态毒理学国家重点实验室_期刊论文

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