Bimetallic Nanocobs: Decorating Silver Nanowires with Gold Nanoparticles

Gunawidjaja, Ray; Peleshanko, Sergiy; Ko, Hyunhyub; Tsukruk, Vladimir V.

doi:10.1002/adma.200703170

Cited by 124 publications

(123 citation statements)

References 65 publications

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“…19,20,[22][23][24][25][26] The enhancement may be attributed to abundant Raman hotspots such as nanopores/nanogaps and the junctions between NWs. 8,27,28 Uniformity and stability of the developed SERS-active membrane…”

Section: Bpe (1608 CMmentioning

confidence: 99%

Large scale preparation of surface enhanced Raman spectroscopy substrates based on silver nanowires for trace chemical detection

et al. 2015

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In this paper, a facile large-scale preparation of surface enhanced Raman spectroscopy (SERS) substrates based on silver nanowires has been developed. The SERS substrates can be easily and precisely obtained by filtering bulky amounts of silver nanostructures through hydrophilic filter membranes one time. The developed membranes can be expanded to commercial wafer-style filter membranes of large size (>47 mm in diameter). The as-prepared SERS substrates presented good uniformity and good performance for the detection of crystal violet (CV) and 1,2-di(4-pyridyl)ethylene (BPE). The relative standard deviations (RSD) were less than 5.5% (n ¼ 11) and 5.2% (n ¼ 11) for CV and BPE, respectively.The logarithm of characteristic SERS intensity plotted against CV and BPE concentrations presented a linear relationship over the ranges from 1.0 Â 10 À4 to 1.0 Â 10 À8 mol L À1 and from 5.0 Â 10 À4 to 5.0 Â 10 À9 mol L À1 , respectively. In the detection of natural water samples of river water, MembraneBio-Reactor (MBR) effluent and sewage disposal plant effluent, spiked with CV and BPE, the as-prepared SERS substrates also presented good performance, suggesting that such substrates possessed great potential in a broad range of analytical applications.

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Section: Bpe (1608 CMmentioning

confidence: 99%

Large scale preparation of surface enhanced Raman spectroscopy substrates based on silver nanowires for trace chemical detection

et al. 2015

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“…1,2 This ultrasensitive analytical method has been widely applied on the life and environmental science, 3,4 which inspire a worldwide effort to explore its mechanism both theoretically and experimentally. Various substrates with rough surface were developed for SERS study, such as metallic colloids, 5,6 electrochemically roughened electrodes, 7,8 chemically deposited metal films, 9,10 chemically etched metal nanostructures, 11 and so on.…”

Section: Introductionmentioning

confidence: 99%

Assembly of Gold Nanoparticles on Electrospun Polymer Nanofiber Film for SERS Applications

Wang¹,

Sun²,

Wang³

et al. 2014

Bulletin of the Korean Chemical Society

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We report a novel approach for fabricating active surface-enhanced Raman scattering (SERS) substrate for sensitive detection. This approach is based on the assembling of gold nanoparticles (AuNPs) onto the electrospun polycaprolactone (PCL) nanofiber film. The hydrophobic surface of PCL nanofiber film was pretreated using UV-inducing graft polymerization with acrylic acid. Afterwards this PCL nanofiber film was incubated with the AuNP solution to promote the assembly of AuNPs onto the PCL nanofibers and the formation of SERS active substrate. 4-aminothiophenol (4-ATP) molecule was used as a test probe for SERS experiments, indicating that the substrate has high sensitivity to SERS response. Our method has great advantage in term of environment-friendly synthesis, large-scale, high stability and good reproducibility. This highly active SERS substrate can be employed to detect the drug molecule, 2-thiouracil.

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“…The spectrum of Au particle-on-wire systems displays a broad absorption band associated with the plasmon coupling of NW and NPs. 17 Note that the 633 nm laser for excitation of the particle-on-wire systems is near the absorption maximum and thus allows effective SERS excitation.…”

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confidence: 99%

“…It has been shown that hot spots at nanoscale gaps between a nanowire (NW) and nanoparticles (NPs) can become highly SERS-active. [17][18][19][20][21][22] We have recently reported a new biomolecule detection method that provides reproducible SERS signals by using nanoscale gaps between Au NW and NPs. 23 Here we present a multiplex DNA detection method employing multiple Au particle-on-wire systems as a SERS sensing platform.…”

mentioning

confidence: 99%

Patterned Multiplex Pathogen DNA Detection by Au Particle-on-Wire SERS Sensor

Kang

Yoo²,

Yoon³

et al. 2010

Nano Lett.

354

268

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A Au particle-on-wire system that can be used as a specific, sensitive, and multiplex DNA sensor is developed. A pattern formed by multiple Au nanowire sensors provides positional address and identification for each sensor. By using this system, multiplex sensing of target DNAs was possible in a quantitative manner with a detection limit of 10 pM. Target DNAs from reference bacteria and clinical isolates were successfully identified by this sensor system, enabling diagnostics for infectious diseases.KEYWORDS DNA, multiplex, pathogen, pattern, surface-enhanced Raman scattering M ultiplex, sensitive, and specific DNA detection is of great demand for various biological and biomedical studies including gene profiling, drug screening, and clinical diagnostics because it has a potential to provide the most information from a small sample volume at low cost.1 In this regard, simple, reliable, and highthroughput methods that allow detection of multiple DNAs in one assay have been developed by taking various sensing approaches such as the measurement of fluorescence, [1][2][3] surface plasmon resonance (SPR), 4 electric signals, 5 and mass changes.6 Among these DNA sensing methods, fluorescence-based assay is currently the most preferred technique for multiplex DNA detection.7 Surface-enhanced Raman scattering (SERS) has also been considered as an attractive method for label-free multiplex DNA detection because of its single molecule level sensitivity, 8-10 molecular specificity, 11 and insensitivity to quenching. 7,12 These distinct advantages have led to the development of a number of ingenious SERS sensing platforms. [13][14][15][16] However, achieving optimum reproducibility of SERS signals and detecting various target molecules with a very small sample volume in one assay still remain as challenging tasks for practical multiplex SERS sensors. It has been shown that hot spots at nanoscale gaps between a nanowire (NW) and nanoparticles (NPs) can become highly SERS-active. [17][18][19][20][21][22] We have recently reported a new biomolecule detection method that provides reproducible SERS signals by using nanoscale gaps between Au NW and NPs. 23Here we present a multiplex DNA detection method employing multiple Au particle-on-wire systems as a SERS sensing platform. The system operates by the self-assembly of Au NPs onto Au NW in the presence of target DNAs, providing reproducible SERS signals in proportion to the concentrations of target DNAs. Multiple pathogen DNAs could be successfully detected by employing this method, demonstrating that this multiplex SERS sensor can be used a convenient system for clinical diagnostic and biomolecular interaction studies.Raman signal can be dramatically enhanced by placing the signal carrying molecules in the interstices between the assembled nanostructures. [24][25][26][27][28][29] To fabricate a SERS-active nanostructure that can be turned on by biomolecular binding, we adopted an Au particle-on-wire structure constructed by self-assembly of Au NPs onto Au NW through DN...

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Bimetallic Nanocobs: Decorating Silver Nanowires with Gold Nanoparticles

Cited by 124 publications

References 65 publications

Large scale preparation of surface enhanced Raman spectroscopy substrates based on silver nanowires for trace chemical detection

Large scale preparation of surface enhanced Raman spectroscopy substrates based on silver nanowires for trace chemical detection

Assembly of Gold Nanoparticles on Electrospun Polymer Nanofiber Film for SERS Applications

Patterned Multiplex Pathogen DNA Detection by Au Particle-on-Wire SERS Sensor

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