Synthesis and Characterization of Monometallic (Ag, Cu) and Bimetallic Ag-Cu Particles for Antibacterial and Antifungal Applications

Table 2

Preparation route and characteristics of bimetallic colloids.

Sample label	Preparation route	Structures of metal	LSPR,	Color of solution
Alloy Ag/Cu	Ag3C6H5O7, C4H6O4Cu as precursors, single-step reduction with NaBH4, stabilizer PVP	Alloy	410 nm	Dark yellow
Ag core/Cu shell	Ag3C6H5O7, C4H6O4Cu as precursors, double-step reduction with NaBH4, stabilizer PVP	Core/shell	408 nm	Yellow
Cu core/Ag shell	C4H6O4Cu, Ag3C6H5O7 as precursors, double-step reduction with NaBH4, stabilizer PVP	Core/shell	413 nm; 501 nm	Light brown
NPs Cu/ions Ag^+	First solution: Ag3C6H5O7; second solution: C4H6O4Cu as a precursor, single-step reduction with NaBH4, stabilizer PVP; mixing of previously prepared solutions (1 and 2) in volume ratio 1 : 1	NPs/ions	487 nm	Light brown
NPs Ag/ions Cu^2+	First solution: C4H6O4Cu; second solution: Ag3C6H5O7 as a precursor, single-step reduction with NaBH4, stabilizer PVP; mixing of previously prepared solutions (1 and 2) in volume ratio 1 : 1	NPs/ions	398 nm	Pale yellow