Plasmonic “nano-fingers on nanowires” as SERS substrates

Sharma, Yashna; Dhawan, Anuj

doi:10.1364/ol.41.002085

Cited by 20 publications

(9 citation statements)

References 13 publications

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“…Over the last few decades, substantial efforts have been devoted to developing nanostructured SERS surfaces in order to provide the largest signal enhancement, mainly for identifying particular molecules in solution. These include island films [19][20][21], plasmonic nanowires [22], nanostars [23,24], nanobundles [25], nanocubes and nanoblocks [26], nanofingers on nanowires [27] and nanoantennas [28]. Using such surfaces, enhancement of scattering efficiency ranging from 10 6 to 10 12 has been realized, compared to the corresponding Raman signals obtained in the absence of metallic nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Gold nanoisland substrates for SERS characterization of cultured cells

Milewska¹,

Živanović²,

Merk³

et al. 2019

Biomed. Opt. Express

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We demonstrate a simple approach for fabricating cell-compatible SERS substrates, using repeated gold deposition and thermal annealing. The substrates exhibit SERS enhancement up to six orders of magnitude and high uniformity. We have carried out Raman imaging of fixed mesenchymal stromal cells cultured directly on the substrates. Results of viability assays confirm that the substrates are highly biocompatible and Raman imaging confirms that cell attachment to the substrates is sufficient to realize significant SERS enhancement of cellular components. Using the SERS substrates as an in vitro sensing platform allowed us to identify multiple characteristic molecular fingerprints of the cells, providing a promising avenue towards non-invasive chemical characterization of biological samples.

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Section: Introductionmentioning

confidence: 99%

Gold nanoisland substrates for SERS characterization of cultured cells

Milewska¹,

Živanović²,

Merk³

et al. 2019

Biomed. Opt. Express

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“…Up to now, there are successful approaches (e.g., metal colloid self-assembly, soft lithography, uniaxial stretching) and materials (e.g., biocompatible poly(ε-caprolactone) film, PMMA) for the fabrication of flexible SERS substrates [32][33][34][35][36][37]. For example, Sharma et al proposed "nano-fingers" on silicon nanowire arrays as SERS substrate, in which the silicon nanowire arrays are fabricated by using deep-ultraviolet lithography [38]. Li et al prepared superhydrophobic-superhydrophilic silicon plate for SERS trace detection by metal-assist chemical etching and selectively electrochemical deposition [39].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser Structuring for Flexible Surface-Enhanced Raman Spectroscopy Substrates

Fang

Zhang

et al. 2021

IEEE Photonics J.

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Surface-enhanced Raman spectroscopy (SERS) is an optical technique for molecule identification. However, fabrication of flexible and structured SERS substrates for performance improvement in a facile and cost-effective manner is challenging. In this work, we reported a polytetrafluoroethylene (PTFE)-based flexible SERS substrate by femtosecond laser direct writing (FsLDW) technology. The femtosecond laser-treated PTFE surface is 3D hierarchical micro-/nano-structures, and the structured PTFE-based SERS chip shows excellent performance enhancement. As a result, 10 −7 M can be detected, which shows excellent potentials in developing flexible SERS for wearable electronics.

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“…More specifically, these plasmonic substrates can be employed for surface enhanced Raman scattering (SERS), which allows the inherently weak Raman signals from trace amount of analytes to be sufficiently enhanced for efficient detection. Moreover, plasmonic nanostructures with sub-10 nm gaps lead to a very high electromagnetic (EM) enhancement of SERS signals due to the formation of highly localized electromagnetic hotspots and thus, can be employed as highly sensitive SERS-based chemical or biological sensors [6][7][8][9][10]. However, for employment as efficient SERS based sensors, these plasmonic substrates must have the capability to be fabricated controllably and reproducibly.…”

Section: Introductionmentioning

confidence: 99%

Nanoline-gap controlled self assembly of plasmonic nanoparticles inside plasmonic nanolines

Sharma¹,

Dhawan²

2019

J. Phys. Commun.

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This paper presents plasmonic substrates fabricated by a gap-controlled, template-assisted self assembly of plasmonic nanoparticles-such as spherical nanoparticles and nanorods-inside one dimensional plasmonic nanoline templates fabricated using Deep-UV lithography. This hybrid fabrication processwhich combines the bottom-up process of capillary-force self assembly with the top-down process of Deep-UV lithography-can potentially be employed for large-area fabrication (6 inch or 12 inch wafers) of plasmonic substrates with sub-10 nm gaps. These small gaps lead to a high electromagnetic enhancement which can be highly beneficial if these substrates are employed for sensing based on surface enhanced Raman scattering (SERS). We demonstrate that the templates of plasmonic nanolines act as lithographed traps and direct the capillary-force assembly of metallic nanoparticles. The gaps between the nanolines, along with the shape and dimensions of the nanoparticles, together determine the interparticle distance, packing pattern and the orientation of the assembled nanoparticles inside these nanolines. Moreover, the electromagnetic behavior of these substrates is exhaustively analyzed using Finite Difference Time Domain (FDTD) modeling. Thus, we demonstrate template-directed, capillary-force assembly of plasmonic nanoparticles inside plasmonic nanolines such that the assembly can be controlled by modulating the structural parameters of the template or the assembled nanoparticles, and can be potentially carried out on a large area.

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Plasmonic “nano-fingers on nanowires” as SERS substrates

Cited by 20 publications

References 13 publications

Gold nanoisland substrates for SERS characterization of cultured cells

Gold nanoisland substrates for SERS characterization of cultured cells

Femtosecond Laser Structuring for Flexible Surface-Enhanced Raman Spectroscopy Substrates

Nanoline-gap controlled self assembly of plasmonic nanoparticles inside plasmonic nanolines

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