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Single-Molecule Nonresonant Wide-Field Surface-Enhanced Raman Scattering from Ferroelectrically Defined Au Nanoparticle Microarrays
Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.;Univ Coll Dublin, Conway Inst Biomol & Biomed Res, Dublin D04 N2E5, Ireland..
Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.;Univ Technol Baghdad, Laser & Optoelect Engn Dept, Baghdad 10066, Iraq..
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.ORCID-id: 0000-0001-7185-0457
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2018 (engelsk)Inngår i: ACS OMEGA, ISSN 2470-1343, Vol. 3, nr 3, s. 3165-3172Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Single-molecule detection by surface-enhanced Raman scattering (SERS) is a powerful spectroscopic technique that is of interest for the sensor development field. An important aspect of optimizing the materials used in SERS-based sensors is the ability to have a high density of "hot spots" that enhance the SERS sensitivity to the single-molecule level. Photodeposition of gold (Au) nanoparticles through electric-field-directed self-assembly on a periodically proton-exchanged lithium niobate (PPELN) substrate provides conditions to form well-ordered microscale features consisting of closely packed Au nanoparticles. The resulting Au nanoparticle microstructure arrays (microarrays) are plasmon-active and support nonresonant single-molecule SERS at ultralow concentrations (<10(-9)-10(-13) M) with excitation power densities <1 x 10(-3) W cm(-2) using wide-field imaging. The microarrays offer excellent SERS reproducibility, with an intensity variation of <7.5% across the substrate. As most biomarkers and molecules do not support resonance enhancement, this work demonstrates that PPELN is a suitable template for high-sensitivity, nonresonant sensing applications.

sted, utgiver, år, opplag, sider
AMER CHEMICAL SOC , 2018. Vol. 3, nr 3, s. 3165-3172
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Identifikatorer
URN: urn:nbn:se:kth:diva-225737DOI: 10.1021/acsomega.7b01285ISI: 000427939400077Scopus ID: 2-s2.0-85044217007OAI: oai:DiVA.org:kth-225737DiVA, id: diva2:1196478
Forskningsfinansiär
Swedish Research Council, 622-2010-526; 621-2011-4040
Merknad

QC 20180410

Tilgjengelig fra: 2018-04-10 Laget: 2018-04-10 Sist oppdatert: 2018-04-10bibliografisk kontrollert

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