Chemical Routes to Surface Enhanced Infrared Absorption (SEIRA) Substrates

2018 ◽  
Vol 232 (9-11) ◽  
pp. 1527-1539 ◽  
Author(s):  
Christoph Stanglmair ◽  
Frank Neubrech ◽  
Claudia Pacholski
Keyword(s):  
Gold Nanoparticle ◽  
Gold Nanostructures ◽  
Double Layers ◽  
Surface Plasmon Resonances ◽  
Infrared Wavelength ◽  
Geometrical Arrangement ◽  
Surface Enhanced ◽  
Enhancement Factors ◽  
Plasmon Resonances ◽  
Hexagonally Ordered

Abstract Bottom-up strategies for fabricating SEIRA substrates are presented. For this purpose, wet-chemically prepared gold nanoparticles are coated with a polystyrene shell and subsequently self-assembled into different nanostructures such as quasi-hexagonally ordered gold nanoparticle monolayers, double layers, and honeycomb structures. Furthermore elongated gold nanostructures are obtained by sintering of gold nanoparticle double layers. The optical properties of these different gold nanostructures are directly connected to their morphology and geometrical arrangement – leading to surface plasmon resonances from the visible to the infrared wavelength range. Finally, SEIRA enhancement factors are determined. Gold nanoparticle double layers show the best performance as SEIRA substrates.

scholarly journals Surface Plasmon Resonances in Silver Nanostars

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3821 ◽  
Author(s):  
Faustino Reyes Gómez ◽  
Rafael Rubira ◽  
Sabrina Camacho ◽  
Cibely Martin ◽  
Robson da Silva ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Localized Surface Plasmon Resonances ◽  
Sensing Applications ◽  
Surface Enhanced ◽  
Plasmon Resonances ◽  
Difference Time

The recent development of silver nanostars (Ag-NSs) is promising for improved surface-enhanced sensing and spectroscopy, which may be further exploited if the mechanisms behind the excitation of localized surface plasmon resonances (LSPRs) are identified. Here, we show that LSPRs in Ag-NSs can be obtained with finite-difference time-domain (FDTD) calculations by considering the nanostars as combination of crossed nanorods (Ag-NRs). In particular, we demonstrate that an apparent tail at large wavelengths ( λ ≳ 700 nm) observed in the extinction spectra of Ag-NSs is due to a strong dipolar plasmon resonance, with no need to invoke heterogeneity (different number of arms) effects as is normally done in the literature. Our description also indicates a way to tune the strongest LSPR at desired wavelengths, which is useful for sensing applications.

scholarly journals Large-scale self-organized gold nanostructures with bidirectional plasmon resonances for SERS

RSC Advances ◽  
2018 ◽  
Vol 8 (40) ◽  
pp. 22569-22576 ◽  
Author(s):  
Benjamin Schreiber ◽  
Dimitra Gkogkou ◽  
Lina Dedelaite ◽  
Jochen Kerbusch ◽  
René Hübner ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Large Scale ◽  
Surface Enhanced Raman Spectroscopy ◽  
Gold Nanostructures ◽  
Self Organized ◽  
Surface Enhanced ◽  
Plasmon Resonances ◽  
Surface Enhanced Raman

Here we present a two-step fabrication of large-scale self-organized gold nanostructures for multicolor surface-enhanced Raman spectroscopy (SERS). We studied the morphology and plasmonic responses of our substrates and performed optical simulations.

scholarly journals Localized surface plasmon resonances in nanostructures to enhance nonlinear vibrational spectroscopies: towards an astonishing molecular sensitivity

2014 ◽  
Vol 5 ◽  
pp. 2275-2292 ◽  
Author(s):  
Dan Lis ◽  
Francesca Cecchet
Keyword(s):  
Raman Scattering ◽  
Surface Plasmon ◽  
Single Molecule ◽  
Nonlinear Optical ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Surface Enhanced ◽  
Plasmon Resonances ◽  
Vibrational Spectroscopies ◽  
Vibrational Transitions

Vibrational transitions contain some of the richest fingerprints of molecules and materials, providing considerable physicochemical information. Vibrational transitions can be characterized by different spectroscopies, and alternatively by several imaging techniques enabling to reach sub-microscopic spatial resolution. In a quest to always push forward the detection limit and to lower the number of needed vibrational oscillators to get a reliable signal or imaging contrast, surface plasmon resonances (SPR) are extensively used to increase the local field close to the oscillators. Another approach is based on maximizing the collective response of the excited vibrational oscillators through molecular coherence. Both features are often naturally combined in vibrational nonlinear optical techniques. In this frame, this paper reviews the main achievements of the two most common vibrational nonlinear optical spectroscopies, namely surface-enhanced sum-frequency generation (SE-SFG) and surface-enhanced coherent anti-Stokes Raman scattering (SE-CARS). They can be considered as the nonlinear counterpart and/or combination of the linear surface-enhanced infrared absorption (SEIRA) and surface-enhanced Raman scattering (SERS) techniques, respectively, which are themselves a branching of the conventional IR and spontaneous Raman spectroscopies. Compared to their linear equivalent, those nonlinear vibrational spectroscopies have proved to reach higher sensitivity down to the single molecule level, opening the way to astonishing perspectives for molecular analysis.

scholarly journals Double Plasmon Resonance Nanostructured Silver Coatings with Tunable Properties

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Anna Kuzminova ◽  
Pavel Solař ◽  
Peter Kúš ◽  
Ondřej Kylián
Keyword(s):  
Silver Nanoparticles ◽  
The Novel ◽  
Surface Plasmon Resonances ◽  
Visible Part ◽  
Surface Enhanced ◽  
Plasmon Resonances ◽  
Application Potential ◽  
Sputter Deposited ◽  
Novel Strategy ◽  
High Application

Plasmonic materials that exhibit dual or multiple localised surface plasmon resonances (LSPRs) due to their high application potential in biosensing and biodetection are gaining increasing attention. Here, we report on the novel strategy suitable for the production of silver nanostructured dual-LSPR coatings. This fully vacuum-based technique uses a magnetron sputtering of Ag and a gas aggregation source of silver nanoparticles. It is shown that when combined, produced Ag nano-islands and nanoparticles exhibit due to their different sizes and shapes two independent LSPRs in the visible part of spectra. Furthermore, the intensities and positions of individual LSPR may be precisely controlled by the amount of sputter-deposited nano-islands and a number of Ag nanoparticles, which opens new possibilities for the tailor-made production of novel platforms for surface-enhanced spectroscopic biodetection.

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