Use of a perfectly conducting sphere to excite the plasmon of a flat surface. 1. Calculation of the local field with applications to surface-enhanced spectroscopy

Aravind, P. K.; Metiu, Horia

doi:10.1021/j100223a007

Cited by 93 publications

(96 citation statements)

References 3 publications

(3 reference statements)

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“…29,30 In the case of the plasmonic nanoparticles, it has been shown that "hot spots" are naturally generated in the aggregation process, which enhances the plasmon coupling interactions. Theoretical studies 31 support the conclusion that the "hot spots" are localized in the region between two interacting nanoparticles where the electric field is strongly intensified under the influence of the longitudinal plasmon resonance, which, on the other hand, is responsible for the red shifted coupling band. The electric field in the "hot spot" region depends on the direction of the electric dipole vector of the electromagnetic radiation relative to the interparticle axis, reaching the maximum when the polarization vector is parallel to this axis ( Figure 4).…”

Section: Plasmon Resonance and Serssupporting

confidence: 48%

“…The electric field in the "hot spot" region depends on the direction of the electric dipole vector of the electromagnetic radiation relative to the interparticle axis, reaching the maximum when the polarization vector is parallel to this axis ( Figure 4). 31 Another important aspect is that the metal-adsorbate structure permits new excitations, such as the chargetransfer (CT) transitions from the Fermi level (E F ) to the lowest unnoccupied molecular orbitals of the molecule (E F →LUMO) or from the highest occupied molecular orbital to E F (HOMO→E F ). When the excitation is in resonance with the electronic transition in the metaladsorbate complex, the surface-enhanced Raman scattering can also incorporate this type of metal-molecule chargetransfer mechanism, as originally proposed by Otto et al 32 Usually, the Fermi level for metals (e.g., -4.3 eV for Ag) lies above the HOMO of most molecules (e.g., -9.26 eV for pyridine), and lower than their LUMO level.…”

Section: Plasmon Resonance and Sersmentioning

confidence: 99%

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The coordination chemistry at gold nanoparticles

Toma¹,

Zamarion²,

Toma³

et al. 2010

J. Braz. Chem. Soc.

117

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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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Section: Plasmon Resonance and Serssupporting

confidence: 48%

Section: Plasmon Resonance and Sersmentioning

confidence: 99%

The coordination chemistry at gold nanoparticles

Toma¹,

Zamarion²,

Toma³

et al. 2010

J. Braz. Chem. Soc.

117

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“…[7][8][9][10][11] Since the magnitude of EM enhancement and the resonance wavelength are controllable with the dimer geometry, metallic dimers are considered as a good candidate of well-defined hot spots. Indeed, we have already reported that the metallic nanodimer arrays, which were fabricated with an angle-resolved nanosphere lithography ͑AR-NSL͒ technique, 12 exhibited anisotropic and enormous enhancement of the SERS cross section.…”

mentioning

confidence: 99%

Hyper-Raman scattering enhanced by anisotropic dimer plasmons on artificial nanostructures

Ikeda

Takase²,

Sawai³

et al. 2007

The Journal of Chemical Physics

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Silver nanodimers with a small gap of a few nanometers aligned on glass substrates were used to enhance hyper-Raman scattering of crystal violet dye molecules. When localized surface plasmon of the dimer array was resonantly excited along the interparticle axis, hyper-Raman intensity was significantly enhanced. Moreover, the spectral appearance was slightly different between the two excitation polarizations, suggesting a possibility of two resonance contributions at one-photon and two-photon energies. Since the plasmonic property of dimer arrays can be controlled by the dimer geometry, the dimer arrays are expected to be well-defined substrates for surface-enhanced hyper-Raman spectroscopy

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“…[ [39][40][41] For the complex RhCl 3 (C 6 H 5 SCH 3 ) 3 . Three strong bands at 337cm -1 , 320cm -1 and at 293cm This decrease is due to the fact that the OCH 3 group at para position behaves as a strong electron releasing one here the resonance effect outweighs the electron -with drawing inductive effect and the -OCH 3 group has a net electron-releasing tendency to the benzene ring, and so the v(Rh-S) stretching frequency is decreased to a lower region than that of the A similar observation is made in NMR studies of some substituted phenyl methyl sulphides.…”

Section: Electronic Spectra Of Complexesmentioning

confidence: 99%

Spectroscopic Evidence for Steric Enhancement of Resonance in Rhodium (Iii) Chloride Complexes

Sreenivasarao¹

2017

WJPR

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The assignments reveal that the carboxyl substituted complexes are isolated as fac-isomers and all the remaining seven complexes are having mer-octahedral configuration. Using these sulphides as ligands hydrogen bonding between -OH of carboxylic group and chlorine. The carboxyl frequency of meta and para carboxylic groups gets increased when compared with the ligands. But in the case of higher stability of the meta and para isomers. In recording the electronic spectra the same solvent was used both for the complex and ligand. Generally the bathochromic shift is observed when there is an electron releasing group present in the benzene ring and the presence of electron withdrawing group or steric inhibition results in a hypsochromic shift.The complexes involving p-NO 2 and p-COOH substituted phenyl methyl sulphides have the absorption bands almost identical with those of ligands. When an electron donor is present in

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Use of a perfectly conducting sphere to excite the plasmon of a flat surface. 1. Calculation of the local field with applications to surface-enhanced spectroscopy

Cited by 93 publications

References 3 publications

The coordination chemistry at gold nanoparticles

The coordination chemistry at gold nanoparticles

Hyper-Raman scattering enhanced by anisotropic dimer plasmons on artificial nanostructures

Spectroscopic Evidence for Steric Enhancement of Resonance in Rhodium (Iii) Chloride Complexes

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