AAO Template-Assisted Fabrication of Ordered Ag Nanoparticles-Decorated Au Nanotubes Array for Surface-Enhanced Raman Scattering Detection

Kexi Sun, Quan Deng and Haibin Tang
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Kexi Sun: Key Laboratory of Electromagnetic Transformation and Detection of Henan Province, College of Physics and Electronic Information, Luoyang Normal University, Luoyang 471934, China
Quan Deng: Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
Haibin Tang: Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Technology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China

Sustainability, 2022, vol. 14, issue 3, 1-9

Abstract: Highly sensitive and reproducible surface-enhanced Raman scattering (SERS) substrates are the main challenge for practical applications. In this work, an ordered and hierarchical Ag nanoparticles (Ag-NPs)-decorated Au nanotubes (Au-NTs) array was achieved based on a funnel-shaped pore anodic aluminum oxide (AAO) template-assisted strategy. First, funnel-pore-AAO templates were fabricated by further oxidation of conical-pore-AAO templates achieved by multistep anodization and etching. Then physical sputtering was used to assemble the Au-NTs and Ag-NPs using the as-prepared funnel-pore-AAO as sacrificial templates. SEM revealed abundant sub-10 nm neighboring gaps and sub-10 nm nanocavities at the bottom of the nanotubes because of the special shape of the AAO template, which resulted in abundant strong “hot spots” contributing to the sensitive SERS detection. The resultant hierarchical substrates manifested a SERS enhancement factor of 1.8 × 10 7 and reproducible response to 10 −11 M rhodamine 6G and 10 −8 M methyl parathion, showing potential in SERS-based rapid detection of trace pollutants in the environment.

Keywords: AAO; Au nanotube; Ag nanoparticles; funnel-shaped pore; SERS (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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