SERS Amplification from Self-Organized Arrays of Plasmonic Nanocrescents

Giòrdano, Magda; Foti, Antonino; Messina, Elena; Gucciardi, P. G.; Comoretto, Davide; Mongeot, F. Buatier de

doi:10.1021/acsami.5b11843

Cited by 38 publications

(30 citation statements)

References 55 publications

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“…There have been studies into using templates for oblique angle deposition, which will be explored in the next section, in making high quality SERS substrates. One common method of using a template is using the self-assembly nature of polystyrene nanospheres [61,62]. In these cases, the atomic self-shadowing effect is predefined by the nanospheres, so nanoparticles are deposited at regular set intervals.…”

Section: Geometries Of Oad Derived Sers Substratesmentioning

confidence: 99%

“…Since then, technology has allowed fabrication into smaller dimensions with better control, and now different types of templates exist. Lithography and etching techniques are typically used for making templates [64,65], other methods include self-assembled nanoparticles [61,62] and nano-imprinted polymers [17,18,30]. The advantages of using lithography techniques is that resolutions on the order of 5 nm are achievable, however, the cost and scalability remain a challenge for mass production.…”

Section: Template Assisted Depositionmentioning

confidence: 99%

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Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

Chu

Song

et al. 2017

Coatings

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Surface Enhanced Raman Spectroscopy presents a rapid, non-destructive method to identify chemical and biological samples with up to single molecule sensitivity. Since its discovery in 1974, the technique has become an intense field of interdisciplinary research, typically generating >2000 publications per year since 2011. The technique relies on the localised surface plasmon resonance phenomenon, where incident light can couple with plasmons at the interface that result in the generation of an intense electric field. This field can propagate from the surface from the metal-dielectric interface, so molecules within proximity will experience more intense Raman scattering. Localised surface plasmon resonance wavelength is determined by a number of factors, such as size, geometry and material. Due to the requirements of the surface optical response, Ag and Au are typical metals used for surface enhanced Raman applications. These metals then need to have nano features that improve the localised surface plasmon resonance, several variants of these substrates exist; surfaces can range from nanoparticles in a suspension, electrochemically roughened electrodes to metal nanostructures on a substrate. The latter will be the focus of this review, particularly reviewing substrates made by oblique angle deposition. Oblique angle deposition is the technique of growing thin films so that the material flux is not normal to the surface. Films grown in this fashion will possess nanostructures, due to the atomic self-shadowing effect, that are dependent mainly on the deposition angle. Recent developments, applications and highlights of surface enhanced Raman scattering substrates made by oblique angle deposition will be reviewed.Keywords: surface enhanced Raman spectroscopy; coatings on polymer; special substrate materials; metal coatings; deposition, characterisations and applications of sculptured and textured thin films

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Section: Geometries Of Oad Derived Sers Substratesmentioning

confidence: 99%

Section: Template Assisted Depositionmentioning

confidence: 99%

Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

Chu

Song

et al. 2017

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“…[31][32][33][34] Such nanocrescents are attractive structures to demonstrate our concept as they provide sharp tips with high near-eld enhancements ( Fig. 1a) with a simple fabrication process, 35,36 and as they have been successfully employed as substrates for dielectric sensing, 35,37,38 SERS, 39,40 and to enable concentration measurements in microuidics. 41 In this manuscript, we modify the established fabrication process for gold nanocrescents to create a material contrast at the surface of the nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Addressing the plasmonic hotspot region by site-specific functionalization of nanostructures

et al. 2020

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“…Plasmonic nanoantennas have collected a strong research and technological interest within the last decade, due to their unique capability to achieve resonant light scattering and near-field confinement at the nanoscale level, enabling novel functionalities in nano-optics, biosensing and energy harvesting [1][2][3][4][5][6][7][8]. In particular, the possibility to tune localized plasmon resonances of subwavelength noble metal nanostructures over a broadband spectrum has been investigated for the selection and local amplification of weak molecular signals in linear and/or nonlinear optical spectroscopies [2,[6][7][8][9][10][11][12]. One possibility for the nanofabrication of highly sensitive biosensing templates and nanodevices is given by lithographic techniques, which allow the increased complexity of the individual meta-atoms, controlling the shape and/or the inter-particle spacing at the nanoscale level [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Self-Organized Conductive Gratings of Au Nanostripe Dimers Enable Tunable Plasmonic Activity

et al. 2020

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Plasmonic metasurfaces based on quasi-one-dimensional (1D) nanostripe arrays are homogeneously prepared over large-area substrates (cm 2 ), exploiting a novel self-organized nanofabrication method. Glass templates are nanopatterned by ion beam-induced anisotropic nanoscale wrinkling, enabling the maskless confinement of quasi-1D arrays of out-of-plane tilted gold nanostripes, behaving as transparent wire-grid polarizer nanoelectrodes. These templates enable the dichroic excitation of localized surface plasmon resonances, easily tunable over a broadband spectrum from the visible to the near-and mid-infrared, by tailoring the nanostripes' shape and/or changing the illumination conditions. The controlled self-organized method allows the engineering of the nanoantennas' morphology in the form of Au-SiO 2 -Au nanostripe dimers, which show hybridized plasmonic resonances with enhanced tunability. Under this condition, superior near-field amplification is achievable for the excitation of the hybridized magnetic dipole mode, as pointed out by numerical simulations. The high efficiency of these plasmonic nanoantennas, combined with the controlled tuning of the resonant response, opens a variety of applications for these cost-effective templates, ranging from biosensing and optical spectroscopies to high-resolution molecular imaging and nonlinear optics.Appl. Sci. 2020, 10, 1301 2 of 10 ranges, such as Surface Enhanced Raman Scattering (SERS) [17][18][19][20][21] and Surface Enhanced Infrared Absorption (SEIRA) spectroscopy [11,[22][23][24]. Despite the high degree of control provided by the lithographic methods, the reduced patterned areas, limited at the micrometric scale, and/or the multi-step, time-consuming processes strongly hinder the effective application of optimized plasmonic metasurfaces in cost-effective optoelectronic, biosensing and/or diagnostic devices [25,26]. On the other hand, self-assembled nanofabrication methods [27][28][29] allow the large-area functionalization of surfaces, but are generally characterized by low homogeneity and the limited possibility of tailoring the nanostructure's shape.Here, large-area (cm 2 ) highly ordered plasmonic templates are prepared by a novel maskless self-organized nanofabrication method. A nanoscale wrinkling instability in glasses induces quasi-1D nanopatterned templates, which enable the confinement of out-of-plane tilted plasmonic nanostripes and/or nanostripe dimers [30]. The method allows the easy tailoring of the nanostripes' morphology, and thus the tuning of their localized plasmon resonances across the visible (VIS) and near-infrared (IR) spectrum. Most interestingly, our technique enables the engineering of Au-SiO 2 -Au nanostrip dimers supporting hybridized plasmon resonances [31]. A strong sub-radiant near-field confinement can therefore be achieved by exciting the hybridized magnetic dipole mode, with the additional possibility to tune its resonance over a broadband VIS and near-IR spectrum. The possibility to effectively tailor the nanoscale morphology-t...

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SERS Amplification from Self-Organized Arrays of Plasmonic Nanocrescents

Cited by 38 publications

References 55 publications

Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

Addressing the plasmonic hotspot region by site-specific functionalization of nanostructures

Self-Organized Conductive Gratings of Au Nanostripe Dimers Enable Tunable Plasmonic Activity

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