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Issue 2, 2015
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Surface-enhanced Raman scattering on a hierarchical structural Ag nano-crown array in different detection ways

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Abstract

A highly ordered Ag nano-crown array with a hierarchical pattern is designed as a three-dimensional (3D) surface-enhanced Raman scattering (SERS) substrate. It was achieved by depositing Ag on a patterned polymethyl methacrylate (PMMA) film which precisely replicates the patterns of a honeycomb-like anodic aluminum oxide (AAO) template. We made a detailed analysis on the structure of Ag nano-crowns and place emphasis on the detection mode to optimize the excitation and collection of the SERS signals. Finite-different time-domain (FDTD) simulation was performed to confirm and compare electric field enhancement in the gaps between nano-crowns in two different detection ways. All the results exposed and confirmed that the unique detection way of the Ag nano-crown substrate which is different from the traditional mode is optimal. This hierarchical structural Ag nano-crown not only has satisfactory repeatability, but also provides high sensitivity which was supported by the high electric field enhancement in the proper detection way. As a practical application, the detection of pesticide thiram was achieved with a limit of detection down to 1.0 × 10−14 M. This hierarchical structural Ag nano-crown array on a polymer film is a promising candidate as a portable SERS chip.

Graphical abstract: Surface-enhanced Raman scattering on a hierarchical structural Ag nano-crown array in different detection ways

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Publication details

The article was received on 28 Sep 2014, accepted on 01 Nov 2014 and first published on 07 Nov 2014


Article type: Paper
DOI: 10.1039/C4CP04387A
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Citation: Phys. Chem. Chem. Phys., 2015,17, 1173-1179

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    Surface-enhanced Raman scattering on a hierarchical structural Ag nano-crown array in different detection ways

    Y. Wang, Y. Wang, H. Wang, M. Cong, W. Xu and S. Xu, Phys. Chem. Chem. Phys., 2015, 17, 1173
    DOI: 10.1039/C4CP04387A

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