Anemone-like nanostructures for non-lithographic, reproducible, large-area, and ultra-sensitive SERS substrates

Daglar, Bihter; Demirel, Gökçen Birlik; Khudiyev, Tural; Doǧan, Tamer; Tobail, Osama; Altuntaş, Sevde; Büyükserin, Fatih; Bayındır, Mehmet

doi:10.1039/c4nr03909b

Cited by 18 publications

(22 citation statements)

References 36 publications

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“…According to the results, the average intensities at 1078 and 1586 cm −1 were 15414 ± 1488 counts (%RSD = 9.66, n = 12) and 35872 ± 4361 counts (%RSD = 12.16, n = 12), respectively. This value is acceptable considering other previously reported values of 8–12.6% for centimeter scale SERS substrates9373839. Another experiment involved Raman mapping was performed to determine the uniformity within a microscopic area.…”

Section: Resultssupporting

confidence: 61%

“…Most of the NWs-based SERS substrate fabrications have been carried out using either silver nanowires or silver-coated nanowire surfaces678910. For example, a reproducible SERS-based platform capable of bacteria detection was reported using silver nanoparticles (Ag NPs)-decorated silicon nanowires6.…”

mentioning

confidence: 99%

“…For example, a reproducible SERS-based platform capable of bacteria detection was reported using silver nanoparticles (Ag NPs)-decorated silicon nanowires6. A highly sensitive and reproducible SERS substrate was also fabricated by sputtering a silver layer onto the freestanding polymer nanopillars casted from anodized aluminum oxide (AAO) template9. Even though, the use of Ag NWs in SERS applications offers great electromagnetic field enhancement especially hierarchical Ag structures, the major drawback of metallic Ag is the rapid oxidation at the surface of nanostructures.…”

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confidence: 99%

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Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate

Wiriyakun

Pankhlueab

Boonrungsiman

et al. 2016

Sci Rep

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Limitations of achieving highly sensitive and stable surface-enhanced Raman scattering (SERS) substrate greatly concern the suitable method for fabrication of large-area plasmonic nanostructures. Herein we report a simple approach using template-based synthesis to create a highly ordered two-dimensional array of gold-silver alloy nanowires, followed by the controlled dealloying process. This particular step of mild acid etching (15%v/v nitric acid for 5 min) allowed the formation of Raman hot spots on the nanowire tips while maintaining the integrity of highly active alloy composition and rigid nanowire array structure. Full consideration of SERS substrate performance was accomplished using 4-mercaptobenzoic acid (4-MBA) as a probe molecule. Exceedingly higher SERS signal (150-fold) can be achieved with respect to typical gold film substrate. Moreover, an excellent stability of SERS substrate was also determined for over 3 months storage time. In contrast to the previous studies which stability improvement was accomplished at a cost of sensitivity reduction, the simultaneous improvement of sensitivity and stability makes the controlled dealloying process an excellent choice of SERS substrate fabrication. In addition, uniformity and reproducibility studies indicated satisfactory results with the acceptable values of relative standard deviation.

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Section: Resultssupporting

confidence: 61%

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confidence: 99%

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confidence: 99%

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Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate

Wiriyakun

Pankhlueab

Boonrungsiman

et al. 2016

Sci Rep

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“…We have recently reported the nonlithographic fabrication of periodic polymer nanopillar arrays with potential applications from SERS‐based sensing to antireflective coatings . Nanoporous anodized alumina molds (AAMs) were used in simple polymer processing setups like drop casting or melt infiltration to prepare large area films composed of arrays of nanostructures.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoporous anodized alumina molds (AAMs) were used in simple polymer processing setups like drop casting or melt infiltration to prepare large area films composed of arrays of nanostructures. Ultrasensitive SERS substrates were achieved after a thin metal coating of the polymeric nanopillars, which allows the formation of arrays of periodic plasmonic particles . The tunable characteristics of the nanoporous AAMs (porosity, pore‐to‐pore distance, pore shape, etc.)…”

Section: Introductionmentioning

confidence: 99%

Fabrication of thioflavin‐T‐modified nanopillared SERS substrates for ultrasensitive beta‐amyloid peptide detection

Altuntaş

Büyükserin

2018

J Raman Spectroscopy

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Alzheimer disease (AD) is a major cause of death in the world, and despite intense efforts, there is still no cure for this neurodegenerative disorder. Therefore, early diagnosis of AD is of prime importance, and extensive studies are being conducted to improve the current early detection capabilities and to identify new potential biomarkers for this disease. Here in, we report the fabrication of a novel nanobiosensor platform for the surface‐enhanced Raman spectroscopy (SERS)‐based ultrasentisitive detection of beta‐amyloid (1–42) peptide (Aβ[1–42]), a well‐established biomarker of AD. Polymeric films having multibranched nanopillared surfaces (MNS) were first fabricated by drop‐casting polycarbonate solutions onto anodized aluminum oxide molds that possess hierarchically branched pores. After peeling from the nanoporous molds, a 20‐nm Au coating allowed these MNS substrates to sense sub‐picomolar levels of Thioflavin‐T (ThT), a SERS‐active dye, clinically used to diagnose amyloid plaque presence. Of particular interest, the ThT‐modified MNS films demonstrated a gradual ThT SERS signal suppression when incubated with increasing concentrations of Aβ(1–42), and this trend was used to obtain a limit of detection value of 0.5 pg/ml and a linear dynamic range between 0.5 pg/ml and 100 ng/ml. The developed biosensor platform has stable ThT SERS signals for extended periods and displayed promising results in artificial saliva. Ongoing studies are focused on its potential with real body fluids.

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A Motion‐ and Sound‐Activated, 3D‐Printed, Chalcogenide‐Based Triboelectric Nanogenerator

et al. 2015

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separated, there are positive and negative charges generated on coated electrodes depending on the triboelectric polarity of those dielectric materials. Therefore, a perfect design for a triboelectric nanogenerator (TENG) can be achieved by choosing the most distinct materials in terms of triboelectric polarity as well as diminishing of the feature sizes of those materials down to nanometer scale for obtaining maximum contact area. [ 20 ] A list of the triboelectric materials in accordance with their polarity is presented in Table S1, Supporting Information. Working mechanisms of TENG devices are based on two mechanical motion modes, contact and sliding mode. [ 20 ] Recent studies reveal that the sliding mode has a better voltage output. [ 13 ] However, it requires a more complicated device design. The output voltage of TENGs is enhanced above 1 kV by using different material combinations and device geometries. [ 12 ] In this study, we constructed core-shell nanostructures (polyethersulfone (PES) is in the core and As 2 Se 3 is in the shell) for building a 3D TENG device ( Figure 1 a-6,a-7). Aluminum tape was used as a substrate and contact electrode for both polyetherimide (PEI) nanopillars and As 2 Se 3 core-shell nanostructures (Figure 1 a-1,a-5). Detailed information about the fabrication of the As 2 Se 3 core-shell nanostructures and the PEI nanopillars is given in the Supporting Information (see Figure S1). The fl uorination process used in the fabrication of the PEI nanopillars and surface modifi cation of the As 2 Se 3 nanostructures is given in Figure S2 in the Supporting Information. Figure S3 in the Supporting Information illustrates the fabrication process of the nanopillars.Our device can be stimulated by both motion and acoustic waves at different frequencies. We combined fl uorinated As 2 Se 3 kilometer-long core-shell nanostructures, which are produced using an iterative fi ber-drawing technique, with PEI nanopillars, which are produced by a template-based method for the construction of the contact mode TENG in a multilayer fashion. Our device has an output of maximum 1.23 mW direct current (DC) and 0.51 W peak power and can power parallel connected 38 LEDs simultaneously. Our chalcogenide-based TENG has maximum 396 V and 1.6 mA peak-to-peak output voltage and current, respectively. In addition, a fi nite element model is developed to explain contact electrifi cation between core-shell nanostructures and nanopillars using COMSOL Multiphysics. A perfect match between analytically calculated open-circuit voltage (OCV) and OCV measurement for a single layer generator was presented.To enhance the performance of triboelectric devices, there are two important parameters that play a major role in the selection of material combinations: the surface properties and triboelectric polarity. [ 20 ] Since the surface properties can be modifi ed using various techniques, the triboelectric polarity is Scavenging waste energy is an alternative prominent solution, which may play an important role regarding the wor...

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Anemone-like nanostructures for non-lithographic, reproducible, large-area, and ultra-sensitive SERS substrates

Cited by 18 publications

References 36 publications

Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate

Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate

Fabrication of thioflavin‐T‐modified nanopillared SERS substrates for ultrasensitive beta‐amyloid peptide detection

A Motion‐ and Sound‐Activated, 3D‐Printed, Chalcogenide‐Based Triboelectric Nanogenerator

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