Colloids and Surfaces A 538 (2018) 542–548 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Research paper Eﬀect of diaminostilbene as a molecular linker on Ag nanoparticles: SERS study of aggregation and interparticle hot spots in various environments Elena V. Solovyeva , Evgeniy V. Ubyivovk, Anna S. Denisova Saint Petersburg State University, Universitetskaya nab. 7/9, 199034, Saint Petersburg, Russian Federation GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: 4,4′-diaminostilbene (DAS) was used as a molecular linker of Ag nanoparticles prepared by reduction of silver Silver nanoparticles nitrate by sodium borohydride. The inﬂuence of DAS concentration on the nanoparticles aggregation was in- Molecular linker vestigated by Surface enhanced Raman scattering (SERS), UV–vis spectroscopy, transmission electron micro- Hot spots scopy (TEM), and X-ray photoelectron spectroscopy (XPS). It is revealed that linking Ag nanoparticles with hot Surface-enhanced raman spectroscopy −6 spots formation occurs only at sub- or monolayer surface coverage up to 5 × 10 mol/l. At multilayer cov- Stilbene derivatives erage, only single-end interaction of molecules with a surface is possible. The eﬀects of pH and halide salts on the Diamines adsorption mechanism of DAS were also checked. The protonation of amino groups and presence of
Colloids and Surfaces A: Physicochemical and Engineering Aspects – Elsevier
Published: Feb 5, 2018
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