Non-resonance SERS effects of silver colloids with different shapes

Tiwari, Vidhu S.; Tovmachenko, O. G.; Darbha, Gopala Krishna; Hardy, W. B.; Singh, Jaspal; Ray, Paresh Chandra

doi:10.1016/j.cplett.2007.07.106

Cited by 183 publications

(137 citation statements)

References 34 publications

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“…Above the saturation point, the excess molecules form additional layers, resulting in lower electromagnetic and chemical contribution to the enhancement and thus a decrease in the observed SERS signal intensity. [12] We also studied the SERS activity of aggregated Au nanospheres and nanorods of complementary sizes to compare against the enhancing properties of the nanostars (Fig. 5) the sizes of 50 to 200 nm produced similar SERS signals to one another when all other parameters were kept equal.…”

Section: -Mercaptopyridinementioning

confidence: 99%

Surface‐enhanced Raman scattering spectroscopy via gold nanostars

Esentürk

Walker

2008

J Raman Spectroscopy

264

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Anisotropic metallic nanoparticles (NPs) have unique optical properties, which lend them to applications such as surfaceenhanced Raman scattering (SERS) spectroscopy. Star-shaped gold (Au) NPs were prepared in aqueous solutions by the seed-mediated growth method and tested for Raman enhancement using 2-mercaptopyridine (2-MPy) and crystal violet (CV) probing molecules. For both molecules, the SERS activity of the nanostars was notably stronger than that of the spherical Au NPs of similar size. The Raman enhancement factors (EFs) for 2-MPy on Au nanostars and nanorods are comparable and estimated as greater than 5 orders of magnitude. However, the enhancement for CV on nanostars was significantly higher than for nanorods, in particular at CV concentrations of 100 nM or lower.

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Section: -Mercaptopyridinementioning

confidence: 99%

Surface‐enhanced Raman scattering spectroscopy via gold nanostars

Esentürk

Walker

2008

J Raman Spectroscopy

264

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“…However, Ag is considered unstable, degrades in vivo and is typically synthesized with cetrimonium bromide (CTAB), which is considered cytotoxic [282][283][284]. Additionally, it has been demonstrated that the peak intensity ratios of the Raman signal change significantly when silver aggregates are used leading to inconsistent results and poor reproducibility [276,[285][286][287].…”

Section: Surface Enhanced Raman Scattering (Sers) and Electromagneticmentioning

confidence: 99%

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

2016

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By electrodeposition and galvanic replacement reaction, we developed a facile, time-saving, cost-effective, and environmentally friendly, two-step synthesis route to obtain a controllable cobalt oxide/Au hierarchically nanostructured electrode for glucose sensing. The nanomaterials were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy, meanwhile, the sensing performance was investigated by cyclic voltammetry and amperometric response. The results revealed that this novel electrode exhibited excellent electrocatalytic performance toward glucose oxidation, with a wide double-linear range from 0.2 μM to 20 mM and a low detection limit of 0.1 μM based on a signal-to-noise ratio of 3, which was mainly attributed to the ability of loading a small amount of Au with good electron conductivity on the surface of cobalt oxide nanosheets with large active surface area and synergistic electrocatalytic activity of Au and cobalt oxide toward glucose electrooxidation. This facile, sensitive, and selective glucose sensor is also proven to be suitable for the detection of glucose in human serum.

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“…The two dyes have been extensively studied in SERS experiments as they have reliable photostability [35,37,38]. R6G has a maximum adsorption of 530 nm and is off-resonance with both excitations used however MGO which has an excitation maximum at 621nm, therefore at 633 nm is in resonance with the laser.…”

Section: Surface Enhanced Raman Scatteringmentioning

confidence: 99%

Synthesis of size tunable monodispersed silver nanoparticles and the effect of size on SERS enhancement

Cassar

Graham

Larmour

et al. 2014

Vibrational Spectroscopy

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This version is available at https://strathprints.strath.ac.uk/47444/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractSpherical and monodispersed silver nanoparticles (AgNPs) are ideal for fundamental research as the contribution from size and shape can be accounted for in the experimental design. In this paper a seeded growth method is presented, whereby varying the concentration of sodium borohydride reduced silver nanoparticle seeds different sizes of stable spherical nanoparticles with a low polydispersity nanoparticles are produced using hydroquinone as a selective reducing agent. The surface-enhanced Raman scattering (SERS) enhancement factor for each nanoparticle size produced (17, 26, 50, & 65 nm) was then assessed using three different analytes, rhodamine 6G (R6G), malachite green oxalate (MGO) and thiophenol (TP). The enhancement factor gives an indication of the Raman enhancement effect by the nanoparticle. Using non-aggregated conditions and two different laser excitation wavelength (633 nm and 785 nm) it is shown that an increase in particle size results in an increased enhancement for each analyte used.

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Non-resonance SERS effects of silver colloids with different shapes

Cited by 183 publications

References 34 publications

Surface‐enhanced Raman scattering spectroscopy via gold nanostars

Surface‐enhanced Raman scattering spectroscopy via gold nanostars

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

Synthesis of size tunable monodispersed silver nanoparticles and the effect of size on SERS enhancement

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