Reproducible SERRS from structured gold surfaces

Mahajan, Sumeet; Baumberg, Jeremy J.; Russell, Andrea E.; Bartlett, Philip N.

doi:10.1039/b712144j

Cited by 90 publications

(98 citation statements)

References 32 publications

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“…Increasing the signal strength further can be achieved by tailoring the metallic substrate, thereby lowering the limits of detection. Of particular note, are two-dimensional arrays of closely packed metallic nanoparticles (NPs) on a substrate 18 or metallic nanocavities [19][20][21] . These benefit from multiple hot spots being generated in a uniform fashion over a larger substrate area generating high signal enhancement 22 throughout the entire substrate.…”

Section: Introductionmentioning

confidence: 99%

Self-assembled nanoparticle arrays for multiphase trace analyte detection

et al. 2012

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Nanoplasmonic structures designed for trace analyte detection by surface enhanced Raman spectroscopy typically require sophisticated nanofabrication techniques. An alternative to fabricating such arrays is to rely on self-assembly of nanoparticles at liquid-liquid or liquid-air interfaces into close-packed arrays.The density of the arrays can be fine tuned by modifying the nanoparticle functionality, pH of the solution, and salt concentration. Importantly, these arrays are robust, "self-healing", reproducible, and extremely easy to handle. Herein, we report on the use of such platforms made of Au nanoparticles for detection of (multi)analytes from the aqueous, organic, or air phases. The total interfacial area of the Au array, at the liquid-liquid interface, is approximately 25 mm 2 , making this platform ideal for small volume samples, low concentrations, and trace analytes. Importantly, the ease of assembly and rapid 2 detection makes this platform ideal for in-field sample testing of toxins such as explosives, drugs, or other hazardous chemicals.3

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Section: Introductionmentioning

confidence: 99%

Self-assembled nanoparticle arrays for multiphase trace analyte detection

et al. 2012

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“…5d) the LOD is 100 nM. The LOD of MG is 10-fold greater than that of p-ATP because the electronic transition of MG is in resonance with the frequency of the incident laser light 45 .…”

Section: Article Nature Communications | Doi: 101038/ncomms4456mentioning

confidence: 98%

Multimodal label-free detection and discrimination for small molecules using a nanoporous resonator

Park¹,

Bang

Jang³

et al. 2014

Nat Commun

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To detect chemical or biological threats, it is crucial that sensor devices can differentiate various target molecules. In general, each different sensing method has its own strengths and weaknesses due to their respective limitations. For example, although resonant sensors have high sensitivity, they are not able to discriminate target molecules. At the same time, although surface-enhanced Raman spectroscopy is a representative label-free detection method that can discriminate target molecules, its fabrication is often complex and expensive. Here we present a label-free multimodal nanoporous resonator-based system for small molecule detection and discrimination that combines the strengths of each of these sensing methods. Our approach is not only able to improve the sensitivity of the resonant sensor but it can also discriminate the target molecules. Furthermore, the fabrication process is swift (lasting o3 min) and convenient.

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“…As a result, the SERS intensity will scale as the fourth power of the local field enhancement. The role of surface plasmons in SERS is now well-accepted and this effect has been observed for species adsorbed at different plasmonic platforms, including random [194] and organized structures [195]. Nanohole arrays are interesting for SERS investigation because they allow for resonantlyenhanced local fields at the surface of the nanostructured metal film.…”

Section: Surface-enhanced Raman Scatteringmentioning

confidence: 99%

Resonant optical transmission through hole‐arrays in metal films: physics and applications

Gordon¹,

Brolo

Sinton

et al. 2010

Laser & Photonics Reviews

162

104

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Extraordinary optical transmission through an array of holes in a metal film was reported by Ebbesen and coworkers in 1998. Since that work there has been abundant research activity aimed at understanding the physics and at the development of the many applications associated with this phenomenon, hence the topic of this review. The study of hole-arrays in a metal is not new -theoretical contributions on a small-hole array date back to Lord Rayleigh's description of Wood's anomaly in 1907 and there has been considerable research on metal meshes and holearrays since 1962. Bethe's theory, adapted to treat hole-arrays, is the simplest theoretical description of the transmission resonance. Following a description of this basic theory, we present the research on the additional effects from variations in real metal properties at different wavelengths, film thickness, holeshape and lattice configuration. The many promising applications being developed using hole-arrays are examined, including polarization control, filtering, switching, nonlinear optics, surface plasmon resonance sensing, surface-enhanced fluorescence, surface-enhanced Raman scattering, absorption spectroscopy, and quantum interactions. Finally, the various approaches, developments in hole-array fabrication, and integration of hole-arrays into devices are described. (top left) Schematic of resonant transmission through nanohole array using scanning electron microscope image of as-fabricated sample. (top right) Microfluidic chip incorporating nanohole arrays. (bottom) Composite image of array of nanohole arrays used as sensors in a immunoassay-like microfluidic device, showing (left to right) schematic of microfluidic layout, microscope image of arrays in microfluidic channels, and laser transmission modified by adsorbed molecules.

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Reproducible SERRS from structured gold surfaces

Cited by 90 publications

References 32 publications

Self-assembled nanoparticle arrays for multiphase trace analyte detection

Self-assembled nanoparticle arrays for multiphase trace analyte detection

Multimodal label-free detection and discrimination for small molecules using a nanoporous resonator

Resonant optical transmission through hole‐arrays in metal films: physics and applications

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