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SERS Hotspot Engineering by Aerosol Self-Assembly of Plasmonic Ag Nanoaggregates with Tunable Interparticle Distance
Karolinska Institute, Sweden.
Karolinska Institute, Sweden.
RISE Research Institutes of Sweden.ORCID iD: 0000-0002-4697-9192
Stockholm University, Sweden.
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2022 (English)In: Advanced Science, E-ISSN 2198-3844, Vol. 9, no 22, article id 2201133Article in journal (Refereed) Published
Abstract [en]

Surface-enhanced Raman scattering (SERS) is a powerful sensing technique. However, the employment of SERS sensors in practical applications is hindered by high fabrication costs from processes with limited scalability, poor batch-to-batch reproducibility, substrate stability, and uniformity. Here, highly scalable and reproducible flame aerosol technology is employed to rapidly self-assemble uniform SERS sensing films. Plasmonic Ag nanoparticles are deposited on substrates as nanoaggregates with fine control of their interparticle distance. The interparticle distance is tuned by adding a dielectric spacer during nanoparticle synthesis that separates the individual Ag nanoparticles within each nanoaggregate. The dielectric spacer thickness dictates the plasmonic coupling extinction of the deposited nanoaggregates and finely tunes the Raman hotspots. By systematically studying the optical and morphological properties of the developed SERS surfaces, structure–performance relationships are established and the optimal hot-spots occur for interparticle distance of 1 to 1.5 nm among the individual Ag nanoparticles, as also validated by computational modeling, are identified for the highest signal enhancement of a molecular Raman reporter. Finally, the superior stability and batch-to-batch reproducibility of the developed SERS sensors are demonstrated and their potential with a proof-of-concept practical application in food-safety diagnostics for pesticide detection on fruit surfaces is explored. © 2022 The Authors.

Place, publisher, year, edition, pages
John Wiley and Sons Inc , 2022. Vol. 9, no 22, article id 2201133
Keywords [en]
flame aerosol deposition, pesticide residue detection, plasmonic nanoparticles, SERS substrate fabrication, surface-enhanced Raman scattering (SERS), Aerosols, Metal nanoparticles, Pesticides, Plasmonics, Raman scattering, Self assembly, Silver nanoparticles, Substrates, Surface scattering, Synthesis (chemical), Enhanced Raman scattering, Flame aerosol depositions, Pesticides residue detection, Plasmonic nanoparticle, Raman scattering substrate, Surface enhanced Raman, Surface-enhanced raman scattering, Surface-enhanced raman scattering substrate fabrication, Fabrication
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URN: urn:nbn:se:ri:diva-59337DOI: 10.1002/advs.202201133Scopus ID: 2-s2.0-85131310184OAI: oai:DiVA.org:ri-59337DiVA, id: diva2:1672948
Note

Funding details: European Research Council, ERC; Funding details: Stiftelsen för Strategisk Forskning, SSF, FFL18‐0043, RMX18‐0043; Funding details: Karolinska Institutet, KI; Funding details: Vetenskapsrådet, VR, 2016–05113, 2018‐05798, 2021‐02059, 2021–05494; Funding details: Horizon 2020, 758705; Funding text 1: This work received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (ERC Grant Agreement No. 758705). Funding from the Karolinska Institutet, the Swedish Foundation for Strategic Research (SSF) (FFL18‐0043, RMX18‐0043) and the Swedish Research Council (No. 2021–05494, 2021‐02059, 2018‐05798) is kindly acknowledged. The authors thank Birgitta Henriques‐Normark, Staffan Normark, and the BHN group (KI) for the insightful discussions. T.T. acknowledges funding from the Swedish Research Council (No. 2016–05113). The Karolinska Institutet 3D‐EM facility is kindly acknowledged for the acquisition of TEM images and use of their equipment.

Available from: 2022-06-20 Created: 2022-06-20 Last updated: 2023-01-03Bibliographically approved

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Sommertune, Jens

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