biostudies-literatureUnknown15(54)Lee HJMonodispersed spherical Au@Ag-Pt core@multi-shell nanoparticles were synthesized using a co-reduction method that integrates galvanic replacement with a versatile reducing agent. Their nanostructure was thoroughly characterized using scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. The average diameter of the Au core was 18 nm, while the Pt granules within the shell region measured approximately 2.1 nm, with the Ag-Pt shell having an average thickness of 3.3 nm. The catalytic activity of these nanoparticles was evaluated by the reduction of methylene blue dye in the presence of NaBH₄, monitored by ultraviolet-visible spectrophotometry. The mass-to-charge ratio peaks of the reduced dye were further quantified using electrospray ionization mass sRSC advances45928-45941https://www.ebi.ac.uk/biostudies/studies/S-EPMC12642859biostudies-literatureVolume-dependent catalytic efficiency of highly durable Au@Ag-Pt core@multi-shell nanoparticles in methylene blue reduction.PMC12642859Dao ATNKaneko KLee HJfalseVolume-dependent catalytic efficiency of highly durable Au@Ag-Pt core@multi-shell nanoparticles in methylene blue reduction.Monodispersed spherical Au@Ag-Pt core@multi-shell nanoparticles were synthesized using a co-reduction method that integrates galvanic replacement with a versatile reducing agent. Their nanostructure was thoroughly characterized using scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. The average diameter of the Au core was 18 nm, while the Pt granules within the shell region measured approximately 2.1 nm, with the Ag-Pt shell having an average thickness of 3.3 nm. The catalytic activity of these nanoparticles was evaluated by the reduction of methylene blue dye in the presence of NaBH₄, monitored by ultraviolet-visible spectrophotometry. The mass-to-charge ratio peaks of the reduced dye were further quantified using electrospray ionization mass s2025-01-01T00:00:00Z2025 Nov2026-06-05T16:53:56.749Z2026-05-19T03:12:05.196ZS-EPMC126428594129329710.1039/d5ra06393k