Near-infrared excited surface-enhanced Raman spectroscopy of rhodamine 6G on colloidal silver

Kneipp, Katrin; Roth, E.; Engert, C.; Kiefer, W.

doi:10.1016/0009-2614(93)89028-g

Cited by 36 publications

(28 citation statements)

References 21 publications

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“…At the concentration of 10 −6 M , SERS spectral intensity using Au nanoparticles was found to be ∼80% greater than that using the Au seeds. This result is consistent with previously reported data by Ruan et al 28 It has been empirically established that strong SERS effects are obtained when the laser excitation is within the long‐wavelength absorption band corresponding to the collective plasmon oscillations 29, 30. Because the absorption spectra of the Au nanoparticles show a single resonance at about 635 nm (Fig.…”

Section: Resultssupporting

confidence: 92%

Determination of Band Structure Parameters and the Quasi‐Particle Gap of CdSe Quantum Dots by Cyclic Voltammetry

2008

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Band structure parameters such as the conduction band edge, the valence band edge and the quasi-particle gap of diffusing CdSe quantum dots (Q-dots) of various sizes were determined using cyclic voltammetry. These parameters are strongly dependent on the size of the Q-dots. The results obtained from voltammetric measurements are compared to spectroscopic and theoretical data. The fit obtained to the reported calculations based on the semi-empirical pseudopotential method (SEPM)-especially in the strong size-confinement region, is the best reported so far, according to our knowledge. For the smallest CdSe Q-dots, the difference between the quasi-particle gap and the optical band gap gives the electron-hole Coulombic interaction energy (J(e1,h1)). Interband states seen in the photoluminescence spectra were verified with cyclic voltammetry measurements.

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Section: Resultssupporting

confidence: 92%

Determination of Band Structure Parameters and the Quasi‐Particle Gap of CdSe Quantum Dots by Cyclic Voltammetry

2008

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“…In their investigations they have made use of different SERS substrates. Colloidal silver clusters, which are widely used for SERS, were deployed with excitation in the near infrared, 4 as well as using visible light for the analysis of extremely small drug concentrations. 5 An important option is the application of silver island films 6 or electrochemically roughened silver surfaces.…”

Section: Introductionmentioning

confidence: 99%

Surface enhanced Raman scattering (SERS)—a quantitative analytical tool?

Sackmann

Materny

2006

J Raman Spectroscopy

145

113

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Raman spectroscopy is a widely used analytical tool capable of providing valuable information about the chemical structure and composition of molecules. In order to detect substances also at a very low concentration levels, Surface Enhanced Raman Scattering (SERS) was introduced. The different amplification mechanisms result in extreme sensitivity, however, a quantitative use of SERS appears to be problematic. Especially, when deploying silver sols as SERS substrates, the reproducibility of the signal intensities for a given substance concentration is questionable. Experimental results of an investigation of this problem for low concentrations of adenine are presented. Comparison with results obtained for different SERS substrates by other authors reveals clearly different dependencies. Only in a very limited concentration range reproducible and therefore quantitatively utilizable data could be obtained.

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“…The colloidal solution used in our experiments was prepared by a standard citrate reduction procedure [20]. NaCl was added in 10 22 M concentration to achieve optimum SERSenhancement factors [21]. Electron micrographs of the sol taken before the addition of the targeted compound are shown in Ref.…”

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confidence: 99%

Single Molecule Detection Using Surface-Enhanced Raman Scattering (SERS)

et al. 1997

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By exploiting the extremely large effective cross sections (10 217 10 216 cm 2 ͞molecule) available from surface-enhanced Raman scattering (SERS), we achieved the first observation of single molecule Raman scattering. Measured spectra of a single crystal violet molecule in aqueous colloidal silver solution using one second collection time and about 2 3 10 5 W͞cm 2 nonresonant near-infrared excitation show a clear "fingerprint" of its Raman features between 700 and 1700 cm 21. Spectra observed in a time sequence for an average of 0.6 dye molecule in the probed volume exhibited the expected Poisson distribution for actually measuring 0, 1, 2, or 3 molecules.

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Near-infrared excited surface-enhanced Raman spectroscopy of rhodamine 6G on colloidal silver

Cited by 36 publications

References 21 publications

Determination of Band Structure Parameters and the Quasi‐Particle Gap of CdSe Quantum Dots by Cyclic Voltammetry

Determination of Band Structure Parameters and the Quasi‐Particle Gap of CdSe Quantum Dots by Cyclic Voltammetry

Surface enhanced Raman scattering (SERS)—a quantitative analytical tool?

Single Molecule Detection Using Surface-Enhanced Raman Scattering (SERS)

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