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Synthesis and characterization of silver colloidal nanoparticles with different coatings for SERS application

Mikac, Lara; Ivanda, Mile; Gotić, Marijan; Mihelj, Tea; Horvat, Lucija (2014) Synthesis and characterization of silver colloidal nanoparticles with different coatings for SERS application. Journal of Nanoparticle Research, 16 . pp. 2748-2761. ISSN 1388-0764

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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.

Item Type: Article
Uncontrolled Keywords: Aggregating agents; Colloid; Pyridine; Reducing agents; SERS; Silver nanoparticles
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Materials Physics
Division of Physical Chemistry
Project titleProject leaderProject codeProject type
Physic and application of nanostructures and bulk matter (Fizika i primjena nanostruktura i volumne tvari)-Mile Ivanda098-0982904-2898MZOS
Depositing User: Tea Mihelj
Date Deposited: 01 Dec 2015 08:31
DOI: 10.1007/s11051-014-2748-9

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