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



Author(s): Ma, J (Ma, Jing); Liu, W (Liu, Wen); Ma, Z (Ma, Zhe); Song, PS (Song, Peishuai); Zhao, YQ (Zhao, Yongqiang); Yang, FH (Yang, Fuhua); Wang, XD (Wang, Xiaodong)

Source: NANOSCALE Volume: 11 Issue: 42 Pages: 20194-20198 DOI: 10.1039/c9nr05168f Published: NOV 14 2019

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 x 10(6). 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.

Accession Number: WOS:000498838100053

PubMed ID: 31617548

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

ma, jing                  0000-0003-1226-9210

ISSN: 2040-3364

eISSN: 2040-3372

Full Text: https://pubs.rsc.org/en/content/articlelanding/2019/NR/C9NR05168F#!divAbstract


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