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• W2155017316 abstract "Near-field plasmonic coupling and local field enhancement in metal nanoarchitectures, such as arrangements of nanoparticle clusters, have application in many technologies from medical diagnostics, solar cells, to sensors. Although nanoparticle-based cluster assemblies have exhibited signal enhancements in surface-enhanced Raman scattering (SERS) sensors, it is challenging to achieve high reproducibility in SERS response using low-cost fabrication methods. Here an innovative method is developed for fabricating self-organized clusters of metal nanoparticles on diblock copolymer thin films as SERS-active structures. Monodisperse, colloidal gold nanoparticles are attached via a crosslinking reaction on self-organized chemically functionalized poly(methyl methacrylate) domains on polystyrene-block-poly(methyl methacrylate) templates. Thereby nanoparticle clusters with sub-10-nanometer interparticle spacing are achieved. Varying the molar concentration of functional chemical groups and crosslinking agent during the assembly process is found to affect the agglomeration of Au nanoparticles into clusters. Samples with a high surface coverage of nanoparticle cluster assemblies yield relative enhancement factors on the order of 10⁹ while simultaneously producing uniform signal enhancements in point-to-point measurements across each sample. High enhancement factors are associated with the narrow gap between nanoparticles assembled in clusters in full-wave electromagnetic simulations. Reusability for small-molecule detection is also demonstrated. Thus it is shown that the combination of high signal enhancement and reproducibility is achievable using a completely non-lithographic fabrication process, thereby producing SERS substrates having high performance at low cost." @default.
• W2155017316 created "2016-06-24" @default.
• W2155017316 creator A5004124685 @default.
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• W2155017316 creator A5042947230 @default.
• W2155017316 creator A5074954496 @default.
• W2155017316 creator A5080528426 @default.
• W2155017316 date "2012-04-23" @default.
• W2155017316 modified "2023-10-09" @default.
• W2155017316 title "Non-lithographic SERS Substrates: Tailoring Surface Chemistry for Au Nanoparticle Cluster Assembly" @default.
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• W2155017316 doi "https://doi.org/10.1002/smll.201102708" @default.
• W2155017316 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22528745" @default.
• W2155017316 hasPublicationYear "2012" @default.
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