Size selection of colloidal gold aggregates by filtration: effect on surface-enhanced Raman scattering intensities

Freeman, Ronit; Bright, Robin; Hommer, Michael B.; Natan, Michael J.

doi:10.1002/(sici)1097-4555(199908)30:8<733::aid-jrs433>3.0.co;2-e

Cited by 41 publications

(12 citation statements)

References 51 publications

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“…A rule of thumb is always that the smaller the enhancement, the better the reproducibility of the signal. 31 Substrates that sustain high enhancements (∼10 9 ) capable to see single molecules are typically the least reproducible. Part of this issue can be solved by working with low magnification objectives and long integration times to increase sampling range in space and time, respectively (this has the additional benefit of reducing photobleaching issues).…”

Section: Principles Of the Methodsmentioning

confidence: 97%

Quantifying Resonant Raman Cross Sections with SERS

Meyer

Etchegoin

2010

J. Phys. Chem. A

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We propose a method based on surface-enhanced Raman scattering (SERS) to estimate the resonance Raman cross sections of dyes. The latter are notoriously difficult (or impossible) to obtain by normal (spontaneous) constant wave Raman spectroscopy when the fluorescence quantum yield of the molecules is good and the overwhelming effect of fluorescence masks the Raman spectrum. We propose here to use the fluorescence quenching occurring in SERS conditions to overcome simply this problem. The principles of the method are described and its limitations discussed in detail. The method is demonstrated by estimating the resonance Raman differential cross sections for Rhodamine 6G for seven different excitation wavelengths across the visible range.

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Section: Principles Of the Methodsmentioning

confidence: 97%

Quantifying Resonant Raman Cross Sections with SERS

Meyer

Etchegoin

2010

J. Phys. Chem. A

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“…Filtration procedures have also been used to select different sized metal nanoparticles. Freeman et al 25 have examined the effect of filtering nanoparticle solutions on the observed SERS intensity. The nanoparticle solutions were drawn through filters with pore sizes between 1.0 and 0.1 µm.…”

Section: Clustered Nanoparticles In the Solid Phasementioning

confidence: 99%

Nanostructures and nanostructured substrates for surface—enhanced Raman scattering (SERS)

Brown

Milton

2008

J Raman Spectroscopy

221

201

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We review the performance of various nanoscaled structures needed to support the propagation of the surface plasmons responsible for surface-enhanced Raman scattering (SERS), and assess the potential for the optimisation of the compromise between enhancement and reproducibility that they provide, and hence their utility for relevant applications. We divide these nanostructures into those comprising structured arrays of discrete nanoparticles in two or three dimensions, and those comprising structured or regularly patterned surfaces in two or three dimensions. The most promising in terms of this compromise are those that involve the tethering of functionalised metal nanoparticles to surfaces. They are not only reproducible, but the functionalisation provides a measure of selectivity to relevant target analytes that the majority of SERS applications require.

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“…This observation is consistent with the size dependence of the SERS effect reported for gold nanoparticles of different sizes. [39][40][41][42][43] Figure 12 shows a representative set of SERS spectra comparing samples of the assembled nanoparticles in solution and on a gold film surface. For the surface samples, the spectra were taken after the samples were dried.…”

Section: Surface-enhanced Raman Scattering Surface-enhancedmentioning

confidence: 99%

Assembly of Gold Nanoparticles Mediated by Multifunctional Fullerenes

et al. 2007

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The understanding of the interparticle interactions of nanocomposite structures assembled using molecularly capped metal nanoparticles and macromolecular mediators as building blocks is essential for exploring the fine-tunable interparticle spatial and macromolecular properties. This paper reports the results of an investigation of the chemically tunable multifunctional interactions between fullerenes (1-(4-methyl)-piperazinyl fullerene, MPF) and gold nanoparticles. The interparticle spatial properties are defined by the macromolecular and multifunctional electrostatic interactions between the negatively charged nanoparticles and the positively charged fullerenes. In addition to characterization of the morphological properties, the surface plasmon resonance band, dynamic light scattering, and surface-enhanced Raman scattering (SERS) properties of the MPF-mediated assembly and disassembly processes have been determined. The change of the optical properties depends on the pH and electrolyte concentrations. The detection of the Raman-active vibration modes (Ag(2) and Hg(8)) of C60 and the determination of their particle size dependence have demonstrated that the adsorption of MPF on the nanoparticle surface in the MPF-Au nm assembly is responsible for the SERS effect. These findings provide new insights into the delineation between the interparticle interactions and the nanostructural properties for potential applications of the nanocomposite materials in spectroscopic and optical sensors and in controlled releases.

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Size selection of colloidal gold aggregates by filtration: effect on surface-enhanced Raman scattering intensities

Cited by 41 publications

References 51 publications

Quantifying Resonant Raman Cross Sections with SERS

Quantifying Resonant Raman Cross Sections with SERS

Nanostructures and nanostructured substrates for surface—enhanced Raman scattering (SERS)

Assembly of Gold Nanoparticles Mediated by Multifunctional Fullerenes

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