Synthesis and characterization of silver colloidal nanoparticles with different coatings for SERS application (CROSBI ID 215591)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mikac, Lara ; Ivanda, Mile ; Gotić, Marijan ; Mihelj, Tea ; Horvat, Lucija
engleski
Synthesis and characterization of silver colloidal nanoparticles with different coatings for SERS application
Silver colloids were produced by chemical reduction of silver salt (silver nitrate, AgNO3) solution. As reducing agents, trisodium citrate, sodium borohydride, ascorbic acid, polyvinylpyrrolidone, and glucose were used. The colloids were characterized by UV–Vis, DLS, zeta potential measurements, and SEM. The colloids were stabilized with negative groups or large molecules attached to their surface. The surface-enhanced Raman scattering (SERS) effect of stabilized nanoparticles was measured by using pyridine and rhodamine 6G molecules as analytes and NaNO3, KCl, and KBr at different concentrations as aggregating agents. The best Raman signal enhancement was achieved using silver nanoparticles of 40 nm size reduced and stabilized with citrate. The SERS signal of analyte molecules was further enhanced with the addition of sodium borohydride as an alternative aggregating agent. The borohydride had the strongest impact on the SERS effect of the colloid consistent of large (0.5 µm) silver nanoparticles stabilized with aminodextran. The mixture colloid-borohydride-pyridine was stable for hours. The mechanism of borohydride in the colloids is discussed.
Aggregating agents; Colloid; Pyridine; Reducing agents; SERS; Silver nanoparticles
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Podaci o izdanju
16
2014.
2748-1-2748-14
objavljeno
1388-0764
10.1007/s11051-014-2748-9