Surface-enhanced Raman scattering on aluminum using near infrared and visible excitation

Mogensen, Klaus Bo; Gühlke, Marina; Kneipp, Janina; Kadkhodazadeh, Shima; Wagner, Jakob Birkedal; Palanco, Marta Espina; Kneipp, Harald; Kneipp, Katrin

doi:10.1039/c4cc00010b

Cited by 41 publications

(43 citation statements)

References 29 publications

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“…provide strong SERS enhancement at NIR excitation. This is in agreement with former studies, which did show that extinction spectra of plasmonic structures providing extremely high enhancement level in the NIR, such as used in NIR‐excited single molecule SERS experiments, do not necessarily show optically active resonances in the NIR range . This can be understood in the framework of the plasmonic properties of these structures.…”

Section: Resultssupporting

confidence: 92%

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Raman spectroscopic probing of plant material using SERS

Palanco

Mogensen

Kneipp

2015

J Raman Spectroscopy

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We report surface-enhanced Raman studies on intact plant material using onion layers as a biological target, and silver nanoaggregates and silver island films as enhancing plasmonic structures. Surface-enhanced Raman scattering (SERS) enhancement allows the detection of strong Raman signatures of chemical constituents of the surface of the onion layer such as cellulose, proteins, and flavonols. Because of long-time incubation, SERS sensors can access the extracellular space in the inner of the layer. The location of silver nanoparticles inside the onion layer has been monitored by the SERS images collected from chemicals present in the onion and/or reporter molecules attached to the nanoparticles. Our studies show a competitive adsorption of intrinsic bio molecules of the onion layer and reporter molecules. Different spectra from different places of the layer indicate the complex heterogeneous chemical structure of the plant material. The pH-sensitive reporter molecule para mercapto benzoic acid attached to the nanoparticles allows us to infer pH values inside the extracellular matrix of the onion layer.

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Section: Resultssupporting

confidence: 92%

“…The nominal deposited thickness was 10 nm. The nano‐island formation took place during annealing in forming gas for 10 min at 400 °C in an in‐house built reactor . The silver nanostructures were characterized by their optical extinction spectra and scanning electron microscopy (SEM) images.…”

Section: Methodsmentioning

confidence: 99%

Raman spectroscopic probing of plant material using SERS

Palanco

Mogensen

Kneipp

2015

J Raman Spectroscopy

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“…That is attributed to an existence of interband transition around 800 nm (1.5 eV) resulting in a large imaginary part of the dielectric function in visible range [19]. However, recently the first SERS phenomenon has been reported on nanostructured (annealed) Al film with excitation in visible range (e.g., with 785 nm laser) by Mogensen group [20]. In this study as few as 3 × 10 5 -3 × 10 7 molecules of Raman active molecules (adenine, p-mercapto benzoic acid (pMBA), and 4-aminothiophenol (4-ATP)) in the probed focused laser beam area (∼1 m 2 ) were detected by SERS, but no estimates of SERS EFs or/and LOD were reported.…”

Section: Introductionmentioning

confidence: 99%

Commercial Gold Nanoparticles on Untreated Aluminum Foil: Versatile, Sensitive, and Cost-Effective SERS Substrate

Gudun

Elemessova

Khamkhash

et al. 2017

Journal of Nanomaterials

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We introduce low-cost, tunable, hybrid SERS substrate of commercial gold nanoparticles on untreated aluminum foil (AuNPs@AlF). Two or three AuNP centrifugation/resuspension cycles are proven to be critical in the assay preparation. The limits of detection (LODs) for 4-nitrobenzenethiol (NBT) and crystal violet (CV) on this substrate are about 0.12 nM and 0.19 nM, respectively, while maximum analytical SERS enhancement factors (AEFs) are about 107. In comparative assays LODs for CV measured on AuNPs@Au film and AuNPs@glass are about 0.35 nM and 2 nM, respectively. The LOD for melamine detected on AuNPs@ Al foil is 27 ppb with 3 orders of magnitude for linear response range. Overall, AuNPs@AlF demonstrated competitive performance in comparison with AuNPs@ Au film substrate in SERS detection of CV, NBT, and melamine. To check the versatility of the AuNPs@AlF substrate we also detected KNO3 with LODs of 0.7 mM and SERS EF around 2 × 103, which is on the same order with SERS EF reported for this compound in the literature.

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“…Recently, aluminum nanoparticles were investigated in typical plasmonic applications, i.e. efficiency enhancement in solar cells or photodetectors [15][16][17], fluorescence enhancement [18,19] or surface-enhanced Raman spectroscopy [20]. Aluminum was also shown to be a promising candidate for a pixelized color representation, which could find its way into display applications by exploiting the fact that aluminum plasmon resonances can cover the entire visible spectrum.…”

Section: Introductionmentioning

confidence: 99%

Oxide mediated spectral shifting in aluminum resonant optical antennas

Schwab¹,

Moosmann²,

Dopf³

et al. 2015

Opt. Express

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Abstract:As a key feature among metals showing good plasmonic behavior, aluminum extends the spectrum of achievable plasmon resonances of optical antennas into the deep ultraviolet. Due to degradation, a native oxide layer gives rise to a metal-core/oxide-shell nanoparticle and influences the spectral resonance peak position. In this work, we examine the role of the underlying processes by applying numerical nanoantenna models that are experimentally not feasible. Finite-difference time-domain simulations are carried out for a large variety of elongated single-arm and two-arm gap nanoantennas. In a detailed analysis, which takes into account the varying surface-to-volume ratio, we show that the overall spectral shift toward longer wavelengths is mainly driven by the higher index surrounding material rather than by the decrease of the initial aluminum volume. In addition, we demonstrate experimentally that this shifting can be minimized by an all-inert fabrication and subsequent proof-of-concept encapsulation.

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Surface-enhanced Raman scattering on aluminum using near infrared and visible excitation

Cited by 41 publications

References 29 publications

Raman spectroscopic probing of plant material using SERS

Raman spectroscopic probing of plant material using SERS

Commercial Gold Nanoparticles on Untreated Aluminum Foil: Versatile, Sensitive, and Cost-Effective SERS Substrate

Oxide mediated spectral shifting in aluminum resonant optical antennas

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