Silver Nanoparticle Rings of Controllable Size: Multi‐Wavelength SERS Response and High Enhancement of Three Pyridine Derivatives. Issue 6 (9th May 2016)

• Record Type: Journal Article
• Authors: Khanafer, Maher; Izquierdo‐Lorenzo, Irene; Akil, Suzanna; Louarn, Guy; Toufaily, Joumana; Hamieh, Tayssir; Adam, Pierre‐Michel; Jradi, Safi
• Is Part Of: ChemistrySelect. Volume 1:Issue 6(2016)
• Page Start: 1201
• Page End: 1206
• Publication Date: 2016-05-09
• Subjects: SERS -- polymer self-assembly -- silver nanoparticles -- self-organization of nanoparticles -- bipyridine; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201600035
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The preparation method of nanoporous poly(methyl methacrylate)(PMMA) containing silver nanoparticles self‐organized in rings is highly adaptable, yielding a variety of materials of controllable pore size (ranging from 200 nm to over 5 µm), nanoparticle size (20 to 200 nm), surface coverage and silver precursor concentration. In this article, it is optimized aiming at a best performance as enhancers for Surface Enhanced Raman Spectroscopy. The versatility of these sensors is shown by a multi‐wavelength excitation experiment at 457, 488, 514 and 633 nm. Finally, the efficiency of 2, 2'‐bipyridine, 4, 4'‐bipyridine and trans ‐bis‐(4, 4'‐bipyridyl)ethylene as SERS probe molecules is compared using PMMA/Ag‐rings. Ag + ions are shown to play an important role in the adsorption of the target molecules on these surfaces leading to a SERS enhancement factor of 3.78×10 8 at 488 nm for trans ‐bis‐(4, 4'‐bipyridyl)ethylene. Abstract : Small rings to rule them all: A set of SERS sensors has been developed which is based on silver nanoparticles self‐organized forming rings in PMMA thin layers (see image). Variations on the preparation method lead to AgNP rings sizing from 0.3 to over 5 μm in diameter, which present different SERS sensitivity growing with the total area covered by AgNPs. The influence of excitation wavelength and probe molecule was performed. SERS Enhancement Factor reaches 3.8x10 8 at 488 nm for trans ‐bis‐(4, 4'‐bipyridyl)ethylene.