Synthesis of Pt–Ag alloy triangular nanoframes by galvanic replacement reactions followed by saturated NaCl treatment in an aqueous solution

• Pt–Ag triangular nanoframes were prepared using a galvanic replacement reaction of Ag prisms with H2PtCl6.
• Their growth mechanisms were studied by observing TEM and TEM-EDS images and surface plasmon resonance bands.
• Ag-rich Pt–Ag nanoprisms were transformed to Pt-rich Pt–Ag nanoframes by after treatment using saturated NaCl.

Pt–Ag alloy triangular nanoframes were prepared by a galvanic replacement (GR) reaction of Ag nanoprisms with H2PtCl6 in an aqueous solution. Their growth mechanisms were studied by observing transmission electron microscopic (TEM) and TEM-energy dispersed X-ray spectroscopy (EDS) images and surface plasmon resonance (SPR) bands. Results show that triangular Pt–Ag alloy prisms are slowly formed 12–48 h after the addition of H2PtCl6. We found that after treatment using saturated NaCl solution is effective for the transformation of Ag-rich Pt–Ag alloy nanoprisms to Pt-rich Pt–Ag nanoframes.

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