SERS-Active Silver Nanoparticles Prepared by a Simple and Green Method

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Abstract

A very effective, facile and green method to produce silver nanoparticles as surface-enhanced Raman scattering (SERS) substrates is reported. Reduction of silver nitrate with polyethylene glycol 200 without additional steps of introducing other reducing agents or protective agents at room temperature yields silver nanoparticles with particle size less than 5 nm. The as-produced silver nanoparticles can be used as SERS substrates immediately after preparation. The structure and composition of the silver nanoparticles were characterized by UV−visible spectroscopy, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), particle size analyzer (PSA), and Raman spectroscopy, using a 488 nm Ar+ laser and a 632.8 nm HeNe laser. The SERS enhancement of these silver nanoparticles was tested by using tris(2,2′-bipyridyl)ruthenium(II) chloride (Ru(bpy)) and Rhodamine 6G (R6G) in both solid and liquid forms. The silver nanoparticles have been shown to provide elegant SERS signals of Ru(bpy) and R6G, demonstrating the advantage of this new method of preparing Ag-based SERS substrates.

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