Single-Molecule Nonresonant Wide-Field Surface-Enhanced Raman Scattering from Ferroelectrically Defined Au Nanoparticle Microarrays

Sökning: L773:2470 1343 > Single-Molecule Non...

Al-Shammari, Rusul M.Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.;Univ Coll Dublin, Conway Inst Biomol & Biomed Res, Dublin D04 N2E5, Ireland. (författare)

QC 20180410
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.

Al-Attar, NebrasUniv Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.;Univ Technol Baghdad, Laser & Optoelect Engn Dept, Baghdad 10066, Iraq. (författare)
Manzo, MicheleKTH,Tillämpad fysik(Swepub:kth)u1a48z99 (författare)
Gallo, Katia,1972-KTH,Tillämpad fysik(Swepub:kth)u148rx0z (författare)
Rodriguez, Brian J.Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland.;Univ Coll Dublin, Conway Inst Biomol & Biomed Res, Dublin D04 N2E5, Ireland. (författare)
Rice, James H.Univ Coll Dublin, Sch Phys, Dublin D04 N2E5, Ireland. (författare)
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)

Av författaren/redakt...: Al-Shammari, Rus ...; Al-Attar, Nebras; Manzo, Michele; Gallo, Katia, 19 ...; Rodriguez, Brian ...; Rice, James H.

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