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The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement.
Beilstein J Nanotechnol. 2018; 9:2236-2247.BJ

Abstract

Chloride-capped silver nanoparticles (Cl-AgNPs) allow for high-intensity surface-enhanced Raman scattering (SERS) spectra of cationic molecules to be obtained (even at nanomolar concentration) and may also play a key role in understanding some fundamental principles behind SERS. In this study, we describe a fast (<10 min) and simple protocol for obtaining highly SERS-active colloidal silver nanoparticles (AgNPs) with a mean diameter of 36 nm by photoconversion from AgCl precursor microparticles in the absence of any organic reducing or capping agent. The resulting AgNPs are already SERS-activated by the Cl- ions chemisorbed onto the metal surface where the chloride concentration in the colloidal solution is 10-2 M. Consequently, the enhanced SERS spectra of cationic dyes (e.g., crystal violet or 9-aminoacridine) demonstrate the advantages of Cl-AgNPs compared to the as-synthesized AgNPs obtained by standard Ag+ reduction with hydroxylamine (hya-AgNPS) or citrate (cit-AgNPs). The results of SERS experiments on anionic and cationic test molecules comparing Cl-AgNPs, hya-AgNPs and cit-AgNPs colloids activated with different amounts of Cl- and/or cations such as Ag+, Mg2+ or Ca2+ can be explained within the understanding of the adatom model - the chemisorption of cationic analytes onto the metal surface is mediated by the Cl- ions, whereas ions like Ag+, Mg2+ or Ca2+ mediate the electronic coupling of anionic species to the silver metal surface. Moreover, the SERS effect is switched on only after the electronic coupling of the adsorbate to the silver surface at SERS-active sites. The experiments presented in this study highlight the SERS-activating role played by ions such as Cl-, Ag+, Mg2+ or Ca2+, which is a process that seems to prevail over the Raman enhancement due to nanoparticle aggregation.

Authors+Show Affiliations

Faculty of Physics, Babeş-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania.Faculty of Physics, Babeş-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania.Faculty of Physics, Babeş-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania.Faculty of Physics, Babeş-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania.Faculty of Physics, Babeş-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania.Faculty of Physics, Babeş-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania.Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine, Manastur 3-5, 400372 Cluj-Napoca, Romania.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30202692

Citation

Leopold, Nicolae, et al. "The Role of Adatoms in Chloride-activated Colloidal Silver Nanoparticles for Surface-enhanced Raman Scattering Enhancement." Beilstein Journal of Nanotechnology, vol. 9, 2018, pp. 2236-2247.
Leopold N, Stefancu A, Herman K, et al. The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement. Beilstein J Nanotechnol. 2018;9:2236-2247.
Leopold, N., Stefancu, A., Herman, K., Tódor, I. S., Iancu, S. D., Moisoiu, V., & Leopold, L. F. (2018). The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement. Beilstein Journal of Nanotechnology, 9, 2236-2247. https://doi.org/10.3762/bjnano.9.208
Leopold N, et al. The Role of Adatoms in Chloride-activated Colloidal Silver Nanoparticles for Surface-enhanced Raman Scattering Enhancement. Beilstein J Nanotechnol. 2018;9:2236-2247. PubMed PMID: 30202692.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement. AU - Leopold,Nicolae, AU - Stefancu,Andrei, AU - Herman,Krisztian, AU - Tódor,István Sz, AU - Iancu,Stefania D, AU - Moisoiu,Vlad, AU - Leopold,Loredana F, Y1 - 2018/08/22/ PY - 2018/05/09/received PY - 2018/08/03/accepted PY - 2018/9/12/entrez PY - 2018/9/12/pubmed PY - 2018/9/12/medline KW - SERS switch-on effect KW - SERS-active sites KW - chloride activation KW - electronic coupling KW - photoreduction KW - silver nanoparticles SP - 2236 EP - 2247 JF - Beilstein journal of nanotechnology JO - Beilstein J Nanotechnol VL - 9 N2 - Chloride-capped silver nanoparticles (Cl-AgNPs) allow for high-intensity surface-enhanced Raman scattering (SERS) spectra of cationic molecules to be obtained (even at nanomolar concentration) and may also play a key role in understanding some fundamental principles behind SERS. In this study, we describe a fast (<10 min) and simple protocol for obtaining highly SERS-active colloidal silver nanoparticles (AgNPs) with a mean diameter of 36 nm by photoconversion from AgCl precursor microparticles in the absence of any organic reducing or capping agent. The resulting AgNPs are already SERS-activated by the Cl- ions chemisorbed onto the metal surface where the chloride concentration in the colloidal solution is 10-2 M. Consequently, the enhanced SERS spectra of cationic dyes (e.g., crystal violet or 9-aminoacridine) demonstrate the advantages of Cl-AgNPs compared to the as-synthesized AgNPs obtained by standard Ag+ reduction with hydroxylamine (hya-AgNPS) or citrate (cit-AgNPs). The results of SERS experiments on anionic and cationic test molecules comparing Cl-AgNPs, hya-AgNPs and cit-AgNPs colloids activated with different amounts of Cl- and/or cations such as Ag+, Mg2+ or Ca2+ can be explained within the understanding of the adatom model - the chemisorption of cationic analytes onto the metal surface is mediated by the Cl- ions, whereas ions like Ag+, Mg2+ or Ca2+ mediate the electronic coupling of anionic species to the silver metal surface. Moreover, the SERS effect is switched on only after the electronic coupling of the adsorbate to the silver surface at SERS-active sites. The experiments presented in this study highlight the SERS-activating role played by ions such as Cl-, Ag+, Mg2+ or Ca2+, which is a process that seems to prevail over the Raman enhancement due to nanoparticle aggregation. SN - 2190-4286 UR - https://www.unboundmedicine.com/medline/citation/30202692/The_role_of_adatoms_in_chloride_activated_colloidal_silver_nanoparticles_for_surface_enhanced_Raman_scattering_enhancement_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30202692/ DB - PRIME DP - Unbound Medicine ER -
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