Tailoring gold and silver colloidal bimetallic nanoalloys towards SERS detection of rhodamine 6G
authors Girao, AV; Pinheiro, PC; Ferro, M; Trindade, T
nationality International
journal RSC ADVANCES
keywords ENHANCED RAMAN-SCATTERING; NEUTRON POWDER-DIFFRACTION; SURFACE-PLASMON RESONANCE; SHELL NANOPARTICLES; AU-AG; NANOSTRUCTURES; SPECTROSCOPY; NANOCRYSTAL; ABSORPTION; REFINEMENT
abstract Nanoparticles of gold, silver and their bimetallic alloys have been prepared by an adapted method of reduction of the aqueous salts using sodium borohydride. It is demonstrated that the temperature and order of addition of the corresponding salt solutions influence the nanoalloys chemical arrangement giving different surface plasmon resonance behavior. The colloidal dispersions show very good Surface-Enhanced Raman Spectroscopy (SERS) signal towards rhodamine 6G. The obtained nanoparticles were then successfully deposited onto glass supports by evaporation of the respective colloids and also used as functional SERS sensors with efficient detection of trace amounts of the analyzed dye. These spectroscopic studies demonstrated that both mono and bimetallic nanoparticles show very good SERS sensitivity with the advantage of being prepared using a straightforward synthetic method in the absence of an additional stabilizer as needed for commonly used core-shell systems.
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2017
volume 7
issue 26
beginning page 15944
ending page 15951
digital object identifier (doi) 10.1039/c7ra00685c
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000398581100034
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journal analysis (jcr 2017):
journal impact factor 2.936
5 year journal impact factor 3.096
category normalized journal impact factor percentile 58.772
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