Colloidal dendritic nanostructures of gold and silver for SERS analysis of water pollutants
authors Fernandes, T; Fateixa, S; Ferro, M; Nogueira, HIS; Daniel-da-Silva, AL; Trindade, T
nationality International
journal JOURNAL OF MOLECULAR LIQUIDS
author keywords Metal Colloids; Dendrimers; Raman spectroscopy; SERS; Pesticides
keywords ENHANCED RAMAN-SPECTROSCOPY; AU-AG ALLOY; PLASMONIC NANOPARTICLES; ASSEMBLIES; SCATTERING; NANOSPHERES; PESTICIDES; HYBRID
abstract Surface-Enhanced Raman Scattering (SERS) using colloidal metal (Ag, Au) nanoparticles has been regarded as a powerful method for detecting organic pollutants at vestigial levels. Although less investigated, the controlled synthesis of binary nanostructures comprising two metals provides an alternative route to SERS platforms with tuned surface plasmon resonances. Here, we demonstrate that the use of dendrimers allows the formation of distinct combinations of Ag:Au nanostructures that are composed of smaller metal nanocrystals. Our research highlights the role of the dendrimer macromolecules as a multipurpose ligand in the generation of such hybrid nanostructure, including as a reducing agent, an effective long-term colloidal stabilizer and as a molecular glue for interconnecting the primary metal nanocrystals. Noteworthy, the dendrimer-based Ag:Au hybrid nanostructures are more SERS sensitive as compared to the corresponding colloidal blends or to the single-phase metals, as revealed by using molecular pesticides as analytes in spiked water samples. We suggest that the high SERS sensitivity of the hybrid nanostructures is due to interparticle plasmonic coupling occurring between the primary metal nanoparticle aggregates, whose arrangement is templated by the presence of the dendrimer macromolecules. (C) 2021 Elsevier B.V. All rights reserved.
publisher ELSEVIER
issn 0167-7322
isbn 1873-3166
year published 2021
volume 337
digital object identifier (doi) 10.1016/j.molliq.2021.116608
web of science category 11
subject category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
unique article identifier WOS:000681039600134
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journal analysis (jcr 2019):
journal impact factor 5.065
5 year journal impact factor 4.766
category normalized journal impact factor percentile 81.277
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