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Nanoparticle-nanoparticle vs. nanoparticle-substrate hot spot contributions to the SERS signal: studying Raman labelled monomers, dimers and trimers.
Phys Chem Chem Phys. 2017 Feb 08; 19(6):4478-4487.PC

Abstract

We used a combination of Raman microscopy, AFM and TEM to quantify the influence of dimerization on the surface enhanced Raman spectroscopy (SERS) signal for gold and silver nanoparticles (NPs) modified with Raman reporters and situated on gold, silver, and aluminum films and a silicon wafer. The overall increases in the mean SERS enhancement factor (EF) upon dimerization (up by 43% on average) and trimerisation (up by 96% on average) of AuNPs and AgNPs on the studied metal films are within a factor of two, which is moderate when compared to most theoretical models. However, the maximum ratio of EFs for some dimers to the mean EF of monomers can be as high as 5.5 for AgNPs on a gold substrate. In contrast, for dimerization and trimerization of gold and silver NPs on silicon, the mean EF increases by 1-2 orders of magnitude relative to the mean EF of single NPs. Therefore, hot spots in the interparticle gap between gold nanoparticles rather than hot spots between Au nanoparticles and the substrate dominate SERS enhancement for dimers and trimers on a silicon substrate. However, Raman labeled noble metal nanoparticles on plasmonic metal films generate on average SERS enhancement of the same order of magnitude for both types of hot spot zones (e.g. NP/NP and NP/metal film).

Authors+Show Affiliations

Department of Chemistry, School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan. rostislav.bukasov@nu.edu.kz and National University of Science and Technology MISiS, Leninskii pr. 4, Moscow 119049, Russia. sergeenko_sergei@ukr.net.Department of Chemistry, School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan. rostislav.bukasov@nu.edu.kz.Department of Chemistry, School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan. rostislav.bukasov@nu.edu.kz.Department of Chemistry, School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan. rostislav.bukasov@nu.edu.kz.Department of Chemistry, School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan. rostislav.bukasov@nu.edu.kz.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28120963

Citation

Sergiienko, Sergii, et al. "Nanoparticle-nanoparticle Vs. Nanoparticle-substrate Hot Spot Contributions to the SERS Signal: Studying Raman Labelled Monomers, Dimers and Trimers." Physical Chemistry Chemical Physics : PCCP, vol. 19, no. 6, 2017, pp. 4478-4487.
Sergiienko S, Moor K, Gudun K, et al. Nanoparticle-nanoparticle vs. nanoparticle-substrate hot spot contributions to the SERS signal: studying Raman labelled monomers, dimers and trimers. Phys Chem Chem Phys. 2017;19(6):4478-4487.
Sergiienko, S., Moor, K., Gudun, K., Yelemessova, Z., & Bukasov, R. (2017). Nanoparticle-nanoparticle vs. nanoparticle-substrate hot spot contributions to the SERS signal: studying Raman labelled monomers, dimers and trimers. Physical Chemistry Chemical Physics : PCCP, 19(6), 4478-4487. https://doi.org/10.1039/c6cp08254h
Sergiienko S, et al. Nanoparticle-nanoparticle Vs. Nanoparticle-substrate Hot Spot Contributions to the SERS Signal: Studying Raman Labelled Monomers, Dimers and Trimers. Phys Chem Chem Phys. 2017 Feb 8;19(6):4478-4487. PubMed PMID: 28120963.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Nanoparticle-nanoparticle vs. nanoparticle-substrate hot spot contributions to the SERS signal: studying Raman labelled monomers, dimers and trimers. AU - Sergiienko,Sergii, AU - Moor,Kamila, AU - Gudun,Kristina, AU - Yelemessova,Zarina, AU - Bukasov,Rostislav, PY - 2017/1/26/pubmed PY - 2017/1/26/medline PY - 2017/1/26/entrez SP - 4478 EP - 4487 JF - Physical chemistry chemical physics : PCCP JO - Phys Chem Chem Phys VL - 19 IS - 6 N2 - We used a combination of Raman microscopy, AFM and TEM to quantify the influence of dimerization on the surface enhanced Raman spectroscopy (SERS) signal for gold and silver nanoparticles (NPs) modified with Raman reporters and situated on gold, silver, and aluminum films and a silicon wafer. The overall increases in the mean SERS enhancement factor (EF) upon dimerization (up by 43% on average) and trimerisation (up by 96% on average) of AuNPs and AgNPs on the studied metal films are within a factor of two, which is moderate when compared to most theoretical models. However, the maximum ratio of EFs for some dimers to the mean EF of monomers can be as high as 5.5 for AgNPs on a gold substrate. In contrast, for dimerization and trimerization of gold and silver NPs on silicon, the mean EF increases by 1-2 orders of magnitude relative to the mean EF of single NPs. Therefore, hot spots in the interparticle gap between gold nanoparticles rather than hot spots between Au nanoparticles and the substrate dominate SERS enhancement for dimers and trimers on a silicon substrate. However, Raman labeled noble metal nanoparticles on plasmonic metal films generate on average SERS enhancement of the same order of magnitude for both types of hot spot zones (e.g. NP/NP and NP/metal film). SN - 1463-9084 UR - https://www.unboundmedicine.com/medline/citation/28120963/Nanoparticle_nanoparticle_vs__nanoparticle_substrate_hot_spot_contributions_to_the_SERS_signal:_studying_Raman_labelled_monomers_dimers_and_trimers_ L2 - https://doi.org/10.1039/c6cp08254h DB - PRIME DP - Unbound Medicine ER -
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