Abstract
Smart design of advanced substrates for surface-enhanced Raman scattering (SERS) activity is challenging but vital. Herein, we synthesized a new kind of AgNPs/MnO2@Al flexible substrate as a SERS substrate for the detection of the analyte rhodamine 6G (R6G). The fabrication of porous MnO2 nanoflakes on Al foil was conducted via a facile hydrothermal strategy. Owing to the large active surface area of the MnO2 nanoflakes, the Ag nanoparticles were immobilized and displayed superior SERS performance with a low detection concentration of 1 × 10−6 M for R6G. In addition, the SERS performance was found to be strongly related to the morphology of the MnO2@Al substrate material. Our smart design may provide a new method of construction for other advanced SERS substrates for the detection of R6G.
Highlights
Surface-enhanced Raman spectroscopy (SERS) is a powerful and extremely sensitive analytical technique, which has attracted wide attention since it was rst used to observe a rough Ag electrode.[1]
The aqueous solution and the Al foil were transferred to a Te on-lined stainless-steel autoclave, which was maintained at 160 C for 12, 18 and 24 h, respectively
An Ag nanoparticles (AgNPs)/MnO2@Al hybrid was synthesized via a wet chemical method
Summary
As a common metal oxide, MnO2 has been extensively investigated owing to its low cost, natural abundance, various morphologies, and low toxicity.[25] These advantages provide it with a wide range of applications in catalysis, ion exchange, molecular adsorption, biosensors, and energy storage.[26] MnO2 has various constructions including particles, rods, wires, tubes, sheets and 3D porous nanostructures, in which porous MnO2 frameworks are a signi cant research area owing to their superiority to bulk counterparts in many aspects, such as their. By comparing the SERS performance of the three kinds of support, the AgNPs/ MnO2@Al (18 h) sample was found to have the best properties for the detection of R6G. This is attributed to the 3D porous framework which offers more sites for aggregation of the Ag particles, giving the SERS signal enhancement. We found a new application for Al foil in this study, which could be helpful for further investigation of other metal foils
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