Güzel, RemziyeÜstündağ, ZaferEkşi, HasletKeskin, SeldaTaner, BilgeDurgun, Zeynep GülşahTuran, Aybüke A. İşbirSolak, Ali Osman2020-03-262020-03-262010Güzel, R., Üstündağ, Z., Ekşi, H., Keskin, S., Taner, B., Durgun, Z. G., Turan, A. A. İ., Solak, A. O., (2010). Effect of Au and Au@ag Core-Shell Nanoparticles on the SERS of Bridging Organic Molecules. Journal of Colloid and Interface Science, 351(1), 35-42. doi:10.1016/j.jcis.2010.07.0390021-97971095-7103https://dx.doi.org/10.1016/j.jcis.2010.07.039https://hdl.handle.net/20.500.12395/24799Gold nanoparticles (AuNPs) with about 6 nm size were produced and stabilized with mercaptopropionic acid (MPA) film to produce a monolayer protected cluster (MPC) of AuS(CH2)(2)COOH. 4-Aminothiophenol (ATP) molecules were introduced to the activated carboxylic acid ends of the film surrounding the AuNPs to produce AuS(CH2)(2)CONHPhSH MPC. These modified AuNPs were again self-assembled with Au@Ag core-shell bimetallic nanoparticles via the -SH groups to produce an organic bridge between Au and Au@Ag metallic nanoparticles. An unusually strong enhancement of the Raman signals was observed and assigned to the plasmon coupling between the AuNPs and Au@Ag NPs bridged assembly. Formation of AuS(CH2)(2)COOH and AuS(CH2)(2)CONHPhSH clusters and AuS(CH2)(2)CONHPhS(Au@Ag) assembly is confirmed by UV-Vis, reflection-absorption IR spectroscopy (RAIRS) and X-ray photoelectron spectroscopy (XPS), as well as by TEM analysis. The SERS activity of the AuNPs and Au@Ag NPs was tested using the HS(CH2)(2)CONHPhSH molecule as a probe to compare the effectiveness of monometallic and bimetallic systems. SERS spectra show that Au@Ag bimetallic nanoparticles are very effective SERS-active substrates.en10.1016/j.jcis.2010.07.039info:eu-repo/semantics/openAccessBimetallic nanoparticlesClustersSurface-enhanced Raman spectroscopyTransmission electron microscopyX-ray photoelectron spectroscopyArticle3511354220701922Q1WOS:000282252700005Q2