Surface enhanced Raman scattering (SERS) by molecules adsorbed at spherical particles: errata

Kerker, Milton; Wang, Dau-Sing; Chew, H.

doi:10.1364/ao.19.004159

Cited by 484 publications

(313 citation statements)

References 33 publications

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“…However, an accurate solution of the local fields of plasmon resonant particles of arbitrary shape remains a theoretical challenge. Analytical solutions for the fields are known only for particles with a very simple shape, like that of a sphere or an ellipsoid, [27][28][29][30][31][32][33][34][35] or spherical shells and periodic cylinder gratings. [36][37][38][39][40][41][42][43][44] While electrostatic methods can provide some level of insight, 45 complete electromagnetic solvers are needed to obtain accurate results.…”

Section: Introductionmentioning

confidence: 99%

Plasmon resonances of silver nanowires with a nonregular cross section

et al. 2001

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We investigate numerically the spectrum of plasmon resonances for metallic nanowires with a nonregular cross section, in the 20-50 nm range. We first consider the resonance spectra corresponding to nanowires whose cross sections form different simplexes. The number of resonances strongly increases when the section symmetry decreases: A cylindrical wire exhibits one resonance, whereas we observe more than five distinct resonances for a triangular particle. The spectral range covered by these different resonances becomes very large, giving to the particle-specific distinct colors. At the resonance, dramatic field enhancement is observed at the vicinity of nonregular particles, where the field amplitude can reach several hundred times that of the illumination field. This near-field enhancement corresponds to surface-enhanced Raman scattering ͑SERS͒ enhancement locally in excess of 10 12 . The distance dependence of this enhancement is investigated and we show that it depends on the plasmon resonance excited in the particle, i.e., on the illumination wavelength. The average Raman enhancement for molecules distributed on the entire particle surface is also computed and discussed in the context of experiments in which large numbers of molecules are used.

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Section: Introductionmentioning

confidence: 99%

Plasmon resonances of silver nanowires with a nonregular cross section

et al. 2001

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“…Recent evidence (85) suggests that most of the enhancement may be supported by submicroscopic size particles.…”

Section: Electrochemical Methodsmentioning

confidence: 99%

Laser-induced thermal decay of pyridine and chloride. Surface-enhanced Raman scattering as a probe of silver surface-active sites

Sobocinski

Pemberton²

1988

Langmuir

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The activation parameters for the temperature-dependent irreversible loss of surface-enhanced Raman scattered (SERS) intensity from pyridine and chloride adsorbed at silver surfaces in an electrochemical environment have been determined. Laser-induced heating is used to promote a first-order surface reaction at these roughened silver electrodes and is introduced as a probe of the chemical nature of SERS-active sites. Accurate laser-induced surface temperatures must be known for these experiments and are calculated from spectroscopic data. It is found that the kinetic data follow Arrhenius behavior for both pyridine and chloride. The activation energies associated with the destruction of SERS-active sites at a surface roughened by an illuminated oxidation-reduction cycle (ORC) are 12.8 ± 3.2 and 27.7 ± 3.1 kcal/mol for pyridine at two different types of sites on the Ag surface. Similarly, values for coadsorbed chloride are found to be 11.1 ± 2.4 and 24.5 ± 3.8 kcal/mol. Experiments designed to elucidate the decay mechanism suggest that the laser-induced surface reaction involves desorption of pyridine and chloride from active sites allowing their incorporation into the Ag lattice. The observation of two activation energies in the same temperature region is interpreted in terms of SERS-active sites, which exist at a surface defect and on a terrace plane, respectively. This interpretation is based on the relative activation energies and preexponential factors. The activation parameters for pyridine and chloride desorption are also evaluated at a silver surface roughened by a nonilluminated ORC. An activation energy of 27.4 ± 1.9 kcal/mol is obtained for pyridine on these surfaces. This result suggests that a greater concentration of terrace plane SERS-active sites is present at a surface roughened by an illuminated ORC.

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“…27 derived a very useful expression for EF (equation 9): (9) in which the dominant term at the resonance frequency is 4gg o . Accordingly, the resonance condition embedded in the g fator, i.e., e 1 (w) = -2e m in equation 4, shows that the SERS enhancement will be operative only for materials which can be optically tuned in the spectral region of excitation (w o ).…”

Section: Plasmon Resonance and Sersmentioning

confidence: 99%

The coordination chemistry at gold nanoparticles

Toma¹,

Zamarion²,

Toma³

et al. 2010

J. Braz. Chem. Soc.

119

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Nas nanopartículas de ouro, as propriedades químicas e físicas são ditadas principalmente pelos átomos da superfície, os quais podem interagir com espécies doadoras-aceitadoras, ou ligantes, da mesma forma que os complexos metálicos correspondentes. Além disso, os elétrons podem entrar em ressonância com a luz incidente dando origem aos plasmons de superfície, que levam à intensificação do campo elétrico local e ao efeito SERS, proporcionando uma ampla variedade de aplicações na química, biologia e nanotecnologia. Ligantes de ponte, multifuncionais, podem ser usados para intermediar a ligação de íons metálicos aos átomos de ouro da superfície. Essa estratégia permite controlar a estabilização em solução através das cargas dos complexos metálicos, acrescentando, ao mesmo tempo, novas características químicas e maior funcionalidade às nanopartículas modificadas. Dessa forma, uma nova química de coordenação pode ser vislumbrada, combinando nanopartículas metálicas, como as de ouro, e complexos, à luz da química supramolecular e dos efeitos de ressonância plasmônica de superfície.In gold nanoparticles the surface metal atoms play a major role, determining their chemical and physical properties by interacting with donor-acceptor species or ligands in a similar way as the related metal complexes. In addition, coherent oscillations of the metal electrons in resonance with the frequency of the exciting light give rise to localized surface plasmons responsible for an enhancement of the local electric field and SERS effect, allowing a wide range of applications in chemistry, biology and nanotechnology. Multifunctional bridging ligands can be employed for simultaneously binding metal ions and surface atoms. The attractive point of this approach is the possibility of exploiting the charge controlled stabilization by the metal complexes, while imparting new characteristics and properties to the modified nanoparticles. As a matter of fact, a new, exciting field of coordination chemistry can be envisaged, combining metal nanoparticles and metal complexes, in the light of supramolecular and surface plasmon resonance effects.

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Surface enhanced Raman scattering (SERS) by molecules adsorbed at spherical particles: errata

Cited by 484 publications

References 33 publications

Plasmon resonances of silver nanowires with a nonregular cross section

Plasmon resonances of silver nanowires with a nonregular cross section

Laser-induced thermal decay of pyridine and chloride. Surface-enhanced Raman scattering as a probe of silver surface-active sites

The coordination chemistry at gold nanoparticles

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