Optimization of SERS-active substrates for near-field Raman spectroscopy

Grand, Johan; Kostcheev, Sergeï; Bijeon, Jean-Louis; Chapelle, Marc Lamy de la; Adam, Pierre‐Michel; Rumyantseva, Anna; Lérondel, Gilles; Royer, Pascal

doi:10.1016/s0379-6779(03)00276-5

Cited by 76 publications

(58 citation statements)

References 9 publications

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“…Gold nanorod structures have been produced using both EBL [100,198,199] and FIB techniques. [100,200,201] Figure 12, taken from the work of Billot et al, [198] shows scanning electron microscopy (SEM) images of arrays of gold nanorods fabricated to study the effect of nanorod length on the surface-enhanced plasmon resonances originating from these structures.…”

Section: Lithographic Methodsmentioning

confidence: 99%

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

2009

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Noble metal nanoparticles are capable of confining resonant photons in such a manner as to induce coherent surface plasmon oscillation of their conduction band electrons, a phenomenon leading to two important properties. Firstly, the confinement of the photon to the nanoparticle's dimensions leads to a large increase in its electromagnetic field and consequently great enhancement of all the nanoparticle's radiative properties, such as absorption and scattering. Moreover, by confining the photon's wavelength to the nanoparticle's small dimensions, there exists enhanced imaging resolving powers, which extend well below the diffraction limit, a property of considerable importance in potential device applications. Secondly, the strongly absorbed light by the nanoparticles is followed by a rapid dephasing of the coherent electron motion in tandem with an equally rapid energy transfer to the lattice, a process integral to the technologically relevant photothermal properties of plasmonic nanoparticles. Of all the possible nanoparticle shapes, gold nanorods are especially intriguing as they offer strong plasmonic fields while exhibiting excellent tunability and biocompatibility. We begin this review of gold nanorods by summarizing their radiative and nonradiative properties. Their various synthetic methods are then outlined with an emphasis on the seed-mediated chemical growth. In particular, we describe nanorod spontaneous self-assembly, chemically driven assembly, and polymer-based alignment. The final section details current studies aimed at applications in the biological and biomedical fields.

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Section: Lithographic Methodsmentioning

confidence: 99%

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

2009

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“…[10,11] Studies were conducted with different probe molecules, among them rhodamine B, [12] crystal violet (CV), [13] glycine, [14] and trans-1,2-bis (4-pyridyl)ethylene. [15] The dependence of the electromagnetic contribution to SERS enhancement on nanoparticle size has been investigated in many theoretical studies. [16 -21] Experiments on nanoparticle arrays made from particles of different sizes have been reported.…”

Section: Introductionmentioning

confidence: 99%

SERS enhancement of gold nanospheres of defined size

Joseph

Matschulat

Polte

et al. 2011

J Raman Spectroscopy

150

137

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Monodisperse, citrate-stabilized gold nanoparticles of sizes ranging from 15 to 40 nm were synthesized and characterized by small angle X-ray scattering and UV-vis experiments. Identical surface properties of nanoparticles of different sizes to avoid variation in the chemical surface-enhanced Raman scattering (SERS) enhancement, as well as selection of experimental conditions so that no aggregation took place, enabled the investigation of enhancement of individual nanospheres. Enhancement factors (EFs) for SERS were determined using the dye crystal violet (CV). EFs for individual gold nanospheres ranged from 10 2 to 10 3 , in agreement with theoretical predictions. An increase of the EFs of individual spheres with size can be correlated to changes in the extinction spectra of nanoparticle solutions. This confirms that the increase in enhancement with increasing size results from an increase in electromagnetic enhancement. Beyond this dependence of EFs of isolated gold spheres on their size, EFs were shown to vary with analyte concentration as a result of analyte-induced aggregation. This has implications for the application of nanoparticle solutions as SERS substrates in quantitative analytical tasks.

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“…Truly ellipsoidal nanoparticles are nanoparticles having no revolution axis and can be designed through EBL. Previous studies have shown that by varying the two in plane axes of the nanoparticle and keeping the height constant, both shape and volume effects shift the LSP resonance [10,17,18]. However, the influence of the third axis, the nanoparticle's height, was not assessed.…”

Section: Introductionmentioning

confidence: 99%

Optical Extinction Spectroscopy of Oblate, Prolate and Ellipsoid Shaped Gold Nanoparticles: Experiments and Theory

et al. 2006

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Localized Surface Plasmons (LSP) on metallic nanoparticles of different shapes are investigated by extinction spectroscopy. Experimental results are compared to simulations by a Finite-Difference TimeDomain (FDTD) method. Three different shapes of nanoparticles are compared, oblates, prolates and ellipsoids, in terms of spectral tunability of the LSP resonance (LSPR). It is found that the complete geometry of the nanoparticle must be given to truly define the LSP resonance and that ellipsoids offer the widest spectral tunability.

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Optimization of SERS-active substrates for near-field Raman spectroscopy

Cited by 76 publications

References 9 publications

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

SERS enhancement of gold nanospheres of defined size

Optical Extinction Spectroscopy of Oblate, Prolate and Ellipsoid Shaped Gold Nanoparticles: Experiments and Theory

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