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Rapidly fabricating a large area nanotip microstructure for high-sensitivity SERS applications

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Abstract

Here, we propose a novel nanotip microstructure which can be easily fabricated through a simply Reactive Ion Etching (RIE) process combined with anodic aluminum oxide (AAO) membranes. When combined with Ag coating and annealing on the surface of micro-sized nanotip arrays, the as-formed Ag-nanoparticles (Ag-NPs)/Si-nanotip hybrid structure exhibited a significantly high enhancement factor and highly sensitive surface enhanced Raman scattering (SERS) for rhodamine 6G molecules. The nanotip microstructure showed a sharp curvature with an apex diameter which significantly affected the SERS results. The Ag-NPs/Si-nanotip hybrid structure verified a very prominent “hot spot” effect that exists around the nanotip structures, which contributed mainly to an enhanced SERS signal with an enhancement factor (EF) of 1.6 × 106. Moreover, the Ag-NPs/Si-nanotip hybrid structure demonstrated superior sensitivity, with obvious featured Raman peaks even when the concentration was as low as 10−10 M. Our work demonstrated a feasible way to prepare a novel nanotip microstructure with a highly localized surface plasmon resonance response which could be feasibly applied for highly sensitive and reproducible SERS applications.

Graphical abstract: Rapidly fabricating a large area nanotip microstructure for high-sensitivity SERS applications

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Publication details

The article was received on 18 Jun 2019, accepted on 23 Sep 2019 and first published on 28 Sep 2019


Article type: Paper
DOI: 10.1039/C9NR05168F
Nanoscale, 2019, Advance Article

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    Rapidly fabricating a large area nanotip microstructure for high-sensitivity SERS applications

    J. Ma, W. Liu, Z. Ma, P. Song, Y. Zhao, F. Yang and X. Wang, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR05168F

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