Flexible and mechanical strain resistant large area SERS active substrates

Singh, J. P.; Chu, Hsiaoyun; Abell, Justin; Tripp, Ralph A.; Zhao, Yiping

doi:10.1039/c2nr00020b

Cited by 113 publications

(86 citation statements)

References 38 publications

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“…49,50 The detection of the analytes strongly depends on the interaction between the molecule and the Raman active area of the surface. However, it is still a big challenge to produce large area, sensitive, and reproducible SERS substrates.…”

Section: Pc Nanostructures As a Surface-enhanced Raman Scattering (Sementioning

confidence: 99%

Soft biomimetic tapered nanostructures for large-area antireflective surfaces and SERS sensing

et al. 2013

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We report a facile fabrication method for the fabrication of functional large area nanostructured polymer films using a drop casting technique. Reusable and tapered silicon molds were utilized in the production of functional polymers providing rapid fabrication of the paraboloid nanostructures at the desired structural heights without the requirement of any complex production conditions, such as high temperature or pressure. The fabricated polymer films demonstrate promising qualities in terms of antireflective, hydrophobic and surface enhanced Raman spectroscopy (SERS) features. We achieved up to 92% transmission from the single-side nanostructured polymer films by implementing optimized nanostructure parameters which were determined using a finite difference time domain (FDTD) method prior to production. Large-area nanostructured films were observed to enhance the Raman signal with an enhancement factor of 4.9 Â 10 6 compared to bare film, making them potentially suitable as freestanding SERS substrates. The utilized fabrication method with its demonstrated performances and reliable material properties, paves the way for further possibilities in biological, optical, and electronic applications.

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Section: Pc Nanostructures As a Surface-enhanced Raman Scattering (Sementioning

confidence: 99%

Soft biomimetic tapered nanostructures for large-area antireflective surfaces and SERS sensing

et al. 2013

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“…On the other hand, sputter deposition is a widely employed method in industry that can cover large areas presenting some advantages over wet approaches, 16 and the preparation of SERS substrates using vacuum deposition is a one-step process that can be applied on a variety of different kinds of substrates with excellent reproducibility. 17,18 However, to fully exploit its fabrication capabilities for SERS applications, it is of utmost importance to achieve a deep understanding of the growth mechanism of the deposited nanostructured film. In this sense, Grazing Incidence Small Angle X-Ray Scattering (GISAXS) 19 constitutes a very valuable technique for the morphological characterization of thin films.…”

mentioning

confidence: 99%

Silver substrates for surface enhanced Raman scattering: Correlation between nanostructure and Raman scattering enhancement

Santoro¹,

Yu²,

Schwartzkopf³

et al. 2014

Applied Physics Letters

105

131

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The fabrication of substrates for Surface Enhanced Raman Scattering (SERS) applications matching the needs for high sensitive and reproducible sensors remains a major scientific and technological issue. We correlate the morphological parameters of silver (Ag) nanostructured thin films prepared by sputter deposition on flat silicon (Si) substrates with their SERS activity. A maximum enhancement of the SERS signal has been found at the Ag percolation threshold, leading to the detection of thiophenol, a non-resonant Raman probe, at concentrations as low as 10−10M, which corresponds to enhancement factors higher than 7 orders of magnitude. To gain full control over the developed nanostructure, we employed the combination of in-situ time-resolved microfocus Grazing Incidence Small Angle X-ray Scattering with sputter deposition. This enables to achieve a deepened understanding of the different growth regimes of Ag. Thereby an improved tailoring of the thin film nanostructure for SERS applications can be realized.

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“…For this type of core-shell NPs, core size, type of metal shell, and shell thickness are the critical factors for SERS activity [114][115][116]. [50], (B) gold nanorods [91], (C) silver nanobar [92], (D) silver plasmonic nanodome array [93], (E) gold nanocluster [94], (F) gold nanoholes [67], (G) silver nanovoids [73], (H) silver nanocolumnar film [95], and (I) silver nano-pillars [96]. Reproduced with permission from Refs.…”

Section: Colloidal Structuresmentioning

confidence: 99%

“…SERS performance was tuned by changing the morphology of the array, with the largest enhancement obtained using a triangular tip [96]. Silver nanocolumnar films were deposited on a flexible PDMS and polyethylene terephylate using OAD [95], and the SERS performance changed with mechanical (tensile/bending) strain [95]. Sand paper was used as template for the deposition of silver to obtain SERS substrate to use for the detection of pesticides on difference surfaces [134].…”

Section: Flexible Structuresmentioning

confidence: 99%

“…These are mechanically flexible, low-cost, reproducible, and sensitive and can be manufactured using various advanced methods [73,95,96,[132][133][134][135][136][137][138][139][140][141] to have large areas. Their plasmonic properties can be tuned by changing shape, size, or morphology of nanostructures and also by mechanically bending, stretching, and twisting.…”

Section: Flexible Structuresmentioning

confidence: 99%

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Fundamentals and applications of SERS-based bioanalytical sensing

et al. 2017

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Abstract:Plasmonics is an emerging field that examines the interaction between light and metallic nanostructures at the metal-dielectric interface. Surface-enhanced Raman scattering (SERS) is a powerful analytical technique that uses plasmonics to obtain detailed chemical information of molecules or molecular assemblies adsorbed or attached to nanostructured metallic surfaces. For bioanalytical applications, these surfaces are engineered to optimize for high enhancement factors and molecular specificity. In this review we focus on the fabrication of SERS substrates and their use for bioanalytical applications. We review the fundamental mechanisms of SERS and parameters governing SERS enhancement. We also discuss developments in the field of novel SERS substrates. This includes the use of different materials, sizes, shapes, and architectures to achieve high sensitivity and specificity as well as tunability or flexibility. Different fundamental approaches are discussed, such as label-free and functional assays. In addition, we highlight recent relevant advances for bioanalytical SERS applied to small molecules, proteins, DNA, and biologically relevant nanoparticles. Subsequently, we discuss the importance of data analysis and signal detection schemes to achieve smaller instruments with low cost for SERS-based point-of-care technology developments. Finally, we review the main advantages and challenges of SERS-based biosensing and provide a brief outlook.

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Flexible and mechanical strain resistant large area SERS active substrates

Cited by 113 publications

References 38 publications

Soft biomimetic tapered nanostructures for large-area antireflective surfaces and SERS sensing

Soft biomimetic tapered nanostructures for large-area antireflective surfaces and SERS sensing

Silver substrates for surface enhanced Raman scattering: Correlation between nanostructure and Raman scattering enhancement

Fundamentals and applications of SERS-based bioanalytical sensing

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