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Single-Molecule Non...
Single-Molecule Nonresonant Wide-Field Surface-Enhanced Raman Scattering from Ferroelectrically Defined Au Nanoparticle Microarrays
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- Al-Shammari, Rusul M. (author)
- Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.;Univ Coll Dublin, Conway Inst Biomol & Biomed Res, Dublin D04 N2E5, Ireland.
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- Al-Attar, Nebras (author)
- Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.;Univ Technol Baghdad, Laser & Optoelect Engn Dept, Baghdad 10066, Iraq.
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- Manzo, Michele (author)
- KTH,Tillämpad fysik
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- Gallo, Katia, 1972- (author)
- KTH,Tillämpad fysik
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- Rodriguez, Brian J. (author)
- Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.;Univ Coll Dublin, Conway Inst Biomol & Biomed Res, Dublin D04 N2E5, Ireland.
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- Rice, James H. (author)
- Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.
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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. (creator_code:org_t)
- 2018-03-15
- 2018
- English.
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In: ACS Omega. - : AMER CHEMICAL SOC. - 2470-1343. ; 3:3, s. 3165-3172
- Related links:
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https://pubs.acs.org...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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