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Issue 2, 2015
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Hierarchically assembled NiCo@SiO2@Ag magnetic core–shell microspheres as highly efficient and recyclable 3D SERS substrates

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Abstract

The hierarchically nanosheet-assembled NiCo@SiO2@Ag (NSA) core–shell microspheres have been synthesized by a layer-by-layer procedure at ambient temperature. The mean particle size of NSA microspheres is about 1.7 μm, which is made up of some nanosheets with an average thickness of ∼20 nm. The outer silver shell surface structures can be controlled well by adjusting the concentration of Ag+ ions and the reaction times. The obtained NSA 3D micro/nanostructures show a structure enhanced SERS performance, which can be attributed to the special nanoscale configuration with wedge-shaped surface architecture. We find that NSA microspheres with nanosheet-assembled shell structure exhibit the highest enhancement efficiency and high SERS sensitivity to p-ATP and MBA molecules. We show that the detection limits for both p-ATP and MBA of the optimized NSA microsphere substrates can approach 10−7 M. And the relative standard deviation of the Raman peak maximum is ∼13%, which indicates good uniformity of the substrate. In addition, the magnetic NSA microspheres with high saturation magnetization show a quick magnetic response, good recoverability and recyclability. Therefore, such NSA microspheres may have great practical potential applications in rapid and reproducible trace detection of chemical, biological and environment pollutants with a simple portable Raman instrument.

Graphical abstract: Hierarchically assembled NiCo@SiO2@Ag magnetic core–shell microspheres as highly efficient and recyclable 3D SERS substrates

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Supplementary files

Article information


Submitted
15 Jul 2014
Accepted
07 Nov 2014
First published
07 Nov 2014

Analyst, 2015,140, 440-448
Article type
Paper
Author version available

Hierarchically assembled NiCo@SiO2@Ag magnetic core–shell microspheres as highly efficient and recyclable 3D SERS substrates

M. Zhang, A. Zhao, D. Wang and H. Sun, Analyst, 2015, 140, 440
DOI: 10.1039/C4AN01275E

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