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
Geoderma – Elsevier
Published: Feb 15, 2019
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