| Self-Assembled Large Au Nanoparticle Arrays with Regular Hot Spots for SERS. | |
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MedLine Citation:
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PMID: 21630447 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The cost-effective self-assembly of 80 nm Au nanoparticles (NPs) into large-domain, hexagonally close-packed arrays for high-sensitivity and high-fidelity surface-enhanced Raman spectroscopy (SERS) is demonstrated. These arrays exhibit specific optical resonances due to strong interparticle coupling, which are well reproduced by finite-difference time-domain (FDTD) simulations. The gaps between NPs form a regular lattice of hot spots that enable a large amplification of both photoluminescence and Raman signals. At smaller wavelengths the hot spots are extended away from the minimum-gap positions, which allows SERS of larger analytes that do not fit into small gaps. Using CdSe quantum dots (QDs) a 3-5 times larger photoluminescence enhancement than previously reported is experimentally demonstrated and an unambiguous estimate of the electromagnetic SERS enhancement factor of ≈10(4) is obtained by direct scanning electron microscopy imaging of QDs responsible for the Raman signal. Much stronger enhancement of ≈10(8) is obtained at larger wavelengths for benzenethiol molecules penetrating the NP gaps. |
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Authors:
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Aiqing Chen; A Eugene Deprince; Arnaud Demortière; Alexandra Joshi-Imre; Elena V Shevchenko; Stephen K Gray; Ulrich Welp; Vitalii K Vlasko-Vlasov |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-1 |
Journal Detail:
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Title: Small (Weinheim an der Bergstrasse, Germany) Volume: - ISSN: 1613-6829 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101235338 Medline TA: Small Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
Affiliation:
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Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA. aiqingchen@anl.gov. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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