Plasmonic nanostructures for surface enhanced spectroscopic methods

Jahn, Martin; Patze, Sophie; Hidi, Izabella J.; Knipper, Richard; Radu, Andreea; Mühlig, Anna; Yüksel, Sezin; Peksa, Vlastimil; Weber, Karina; Mayerhöfer, Thomas G.; Cialla‐May, Dana; Popp, Jürgen

doi:10.1039/c5an02057c

Cited by 169 publications

(163 citation statements)

References 391 publications

(462 reference statements)

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“…Surface-enhanced Raman scattering (SERS) is an ultra-sensitive non-invasive spectroscopic technique based on a label-free identification of different molecules placed in the vicinity of plasmonic-active nanostructured metallic substrates [1][2][3][4] . Intensity of the characteristic Raman signal defining the specific vibrational signatures of individual molecules is usually very weak.…”

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confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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Pulsed-laser dry printing of noble-metal microrings with a tunable internal porous structure, which can be revealed via an ion-beam etching post-procedure, was demonstrated. Abundance and average size of the pores inside the microrings were shown to be tuned in a wide range by varying incident pulse energy and a nitrogen doping level controlled in the process of magnetron deposition of the gold film in the appropriate gaseous environment. The fabricated porous microrings were shown to provide many-fold near-field enhancement of incident electromagnetic fields, which was confirmed by mapping of the characteristic Raman band of a nanometer-thick covering layer of Rhodamine 6G dye molecules and supporting finite-difference time-domain calculations. The proposed laserprinting/ion-beam etching approach is demonstrated to be a unique tool aimed at designing and fabricating multifunctional plasmonic structures and metasurfaces for spectroscopic bioidentification based on surface-enhanced infrared absorption, Raman scattering and photoluminescence detection schemes.Surface-enhanced Raman scattering (SERS) is an ultra-sensitive non-invasive spectroscopic technique based on a label-free identification of different molecules placed in the vicinity of plasmonic-active nanostructured metallic substrates 1-4 . Intensity of the characteristic Raman signal defining the specific vibrational signatures of individual molecules is usually very weak. However, this signal can be significantly increased near nanotextured surfaces or nanostructures generating localized, strongly enhanced plasmon-mediated electromagnetic fields. Since the first observation of SERS signal from single molecule 5 , multiple attempts were undertaken to increase the efficiency of SERS-active nanotextured substrates in terms of achieved maximal enhancement factor inside a single "hot spot" as well as number (density) of "hot spots" per individual nanostructure 6-11 .To address both issues, variety of nanotextured structures, predominantly having large surface-to-volume ratio and generating dense hot spots (tipped structures, nanostructures with inner porosity, intra-gap structures or self-assembly superstructures, etc.) were fabricated and tested as versatile SERS substrates 12-23 . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] . Several papers reported fabrication of such sponge-like structures, using dealloying of the two-component template via its dissolving in a corrosive environment 27,28 . Meanwhile, to design sensitive elements for advanced biosensors, along with desirable porosity, it is also important to control the overall size and shape of such porous templates as well as to arrange them into well-ordered arrays at specific point on a substrate with micrometer-scale lateral accuracy. Despite the latter issue can be resolved by using well-establis...

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confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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“…Nanosphere lithography (NSL) is an inexpensive, inherently parallel, high-throughput, materials-general nanofabrication technique that can be used to produce well-ordered 2D periodic arrays of nanoparticles for SERS [89,90,91,92,93,94]. Figure 8 summarizes the three kinds of ordered substrates that can be fabricated using NSL techniques [95].…”

Section: Resultsmentioning

confidence: 99%

Review of SERS Substrates for Chemical Sensing

2017

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The SERS effect was initially discovered in the 1970s. Early research focused on understanding the phenomenon and increasing enhancement to achieve single molecule detection. From the mid-1980s to early 1990s, research started to move away from obtaining a fundamental understanding of the phenomenon to the exploration of analytical applications. At the same time, significant developments occurred in the field of photonics that led to the advent of inexpensive, robust, compact, field-deployable Raman systems. The 1990s also saw rapid development in nanoscience. This convergence of technologies (photonics and nanoscience) has led to accelerated development of SERS substrates to detect a wide range of chemical and biological analytes. It would be a monumental task to discuss all the different kinds of SERS substrates that have been explored. Likewise, it would be impossible to discuss the use of SERS for both chemical and biological detection. Instead, a review of the most common metallic (Ag, Cu, and Au) SERS substrates for chemical detection only is discussed, as well as SERS substrates that are commercially available. Other issues with SERS for chemical detection have been selectivity, reversibility, and reusability of the substrates. How these issues have been addressed is also discussed in this review.

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“…This can be achieved by changing the ionic strength with the addition of salts, or by modifying the pH by adding buffers to the solution. Another way to promote hotspot formation is a mediated aggregation where some ligand cross-link the nanoparticles, forming dimers, trimers or even higher order chains [34]. …”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Detection of Glyphosate in Water Assisted by Laser-Ablated Silver Nanoparticles

Góes¹,

Müller

Fabris

2017

Sensors

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Glyphosate is one of the most widely used herbicides in the world. Its safety for both human health and aquatic biomes is a subject of wide debate. There are limits to glyphosate’s presence in bodies of water, and it is usually detected through complex analytical procedures. In this work, the presence of glyphosate is detected directly through optical interrogation of aqueous solution. For this purpose, silver nanoparticles were produced by pulsed laser ablation in liquids. Limits of detection of 0.9 mg/L and 3.2 mg/L were obtained with UV-Vis extinction and Surface Enhanced Raman spectroscopies, respectively. The sensing mechanism was evaluated in the presence of potential interferents as well as with commercial glyphosate-based herbicides.

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Plasmonic nanostructures for surface enhanced spectroscopic methods

Cited by 169 publications

References 391 publications

Fabrication of porous microrings via laser printing and ion-beam post-etching

Fabrication of porous microrings via laser printing and ion-beam post-etching

Review of SERS Substrates for Chemical Sensing

Spectroscopic Detection of Glyphosate in Water Assisted by Laser-Ablated Silver Nanoparticles

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