Microfabricated SERS-arrays with sharp-edged metallic nanostructures

Huebner, Uwe; Boucher, R.; Schneidewind, H.; Cialla, Dana; Popp, Jürgen

doi:10.1016/j.mee.2008.05.005

Cited by 55 publications

(30 citation statements)

References 7 publications

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“…[1][2][3] Typical SERS active substrates are composed of noble metals (Au, Ag, Cu, Pt) in the form of roughened surfaces, nanoparticle aggregates or arrayed elements. [4][5][6][7][8] From the application point of view, sensitivity, stability and reproducibility are key issues for SERS substrates. In order to optimize these features, the physical phenomena underlying the SERS effect should be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive Ag-coated TiO₂nanotube arrays for flexible SERS-based optofluidic devices

et al. 2015

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In this study, a novel SERS sensor has been developed for repeatable detection of organic molecules and biological assays. Vertically oriented titania nanotube (TiO 2 NT) arrays were grown by ultra-fast anodic oxidation of flexible titanium foils and then decorated with Ag nanoparticles (NPs) through d.c.sputtering deposition at room temperature. A parametric study was carried out taking into account the effect of sputtering parameters on the Ag NP arrangements on the NT surface. The structure morphology was investigated by means of scanning and transmission electron microscopy, evidencing the formation of hexagonal close-packed TiO 2 NTs coated with Ag nanoparticles showing tunable diameter and distribution. The substrates were employed in a SERS optofluidic device, consisting of a polydimethylsiloxane cover irreversibly sealed to the silver-coated TiO 2 NTs, able to detect Rhodamine molecules in ethanol over a wide range of concentrations down to 10 À14 M, taking advantage of both electromagnetic and chemical enhancements. In order to evaluate the performances of the SERS substrates in terms of biosensing, an optimized protocol for the immobilization of oligonucleotide probes on the metal-dielectric surfaces was developed for verifying the hybridization events.

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Section: Introductionmentioning

confidence: 99%

Ultrasensitive Ag-coated TiO₂nanotube arrays for flexible SERS-based optofluidic devices

et al. 2015

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“…Even though silver yields fifty times higher enhancement factors, [30] we decided to use gold due to its higher chemical and temporal stability. A detailed description of the assembly of SERS substrates by means of electron beam lithography can be found in the literature [31] and the process is only summarized here. Quartz substrates were successively coated with a titan adhesion layer of 3 nm and a 20 nm thick gold film by vacuum evaporation.…”

Section: Introductionmentioning

confidence: 99%

Probing Innovative Microfabricated Substrates for their Reproducible SERS Activity

et al. 2008

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New types of microfabricated surface-enhanced Raman spectroscopy (SERS) active substrates produced by electron beam lithography and ion beam etching are introduced. In order to achieve large enhancement factors by using the lightning rod effect, we prepare arrays consisting of sharp-edged nanostructures instead of the commonly used dots. Two experimental methods are used for fabrication: a one-stage process, leading to gold nanostar arrays and a two-stage process, leading to gold nanodiamond arrays. Our preparation process guarantees high reproducibility. The substrates contain a number of arrays for practical applications, each 200x200 microm2 in size. To test the SERS activity of these nanostar and nanodiamond arrays, a monolayer of the dye crystal violet is used. Enhancement factors are estimated to be at least 130 for the nanodiamond and 310 for the nanostar arrays.

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“…These enzymatically generated SERS substrates have been successfully applied for the detection of PCR products amplified from DNA of epizootic pathogens [26]. Furthermore, a top-down approach based on electron beam lithography and ion beam etching has been applied for the preparation of tunable plasmonic arrays [27]. The SERS characterization of such arrays of regular patterned gold nanostructures shows a reproducible Raman signal enhancement across the entire surface [28], [29].…”

Section: B Sers Bioanalyticsmentioning

confidence: 99%

Raman spectroscopy - An essential tool for biophotonics

Popp

Dietzek

Schmitt

et al. 2011

2011 International Workshop on Biophotonics

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Microfabricated SERS-arrays with sharp-edged metallic nanostructures

Cited by 55 publications

References 7 publications

Ultrasensitive Ag-coated TiO₂nanotube arrays for flexible SERS-based optofluidic devices

Ultrasensitive Ag-coated TiO₂nanotube arrays for flexible SERS-based optofluidic devices

Probing Innovative Microfabricated Substrates for their Reproducible SERS Activity

Raman spectroscopy - An essential tool for biophotonics

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Microfabricated SERS-arrays with sharp-edged metallic nanostructures

Cited by 55 publications

References 7 publications

Ultrasensitive Ag-coated TiO2nanotube arrays for flexible SERS-based optofluidic devices

Ultrasensitive Ag-coated TiO2nanotube arrays for flexible SERS-based optofluidic devices

Probing Innovative Microfabricated Substrates for their Reproducible SERS Activity

Raman spectroscopy - An essential tool for biophotonics

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Product

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Ultrasensitive Ag-coated TiO₂nanotube arrays for flexible SERS-based optofluidic devices

Ultrasensitive Ag-coated TiO₂nanotube arrays for flexible SERS-based optofluidic devices