SERS-active substrates from core/shell hydroxyapatite/silver (HA)Ag nanoparticles at the glass surface were prepared and characterized. The high level of their SERS-activity and considerable temporal stability after laser illumination was demonstrated. To our best knowledge, it is the first report on Ag-based substrates exhibiting unusual growth of the SERS signal within first 30 s after 441.6 nm laser beam exposure.
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