Surface enhanced resonance Raman scattering from radial and tangential modes of semiconducting single wall carbon nanotubes

Teredesai, Pallavi V.; Sood, Anil K.; Govindaraj, A.; Rao, C. N. R.

doi:10.1016/s0169-4332(01)00425-1

Cited by 25 publications

(36 citation statements)

References 35 publications

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“…We clearly observe a liner dependence of the G band Stokes intensity on the incident photon flux density. This is in agreement with the results obtained by Terdesai et al, [7] in which this principle was tested for the case of SWNTs adsorbed on silver films.…”

Section: Linear Behavior Of G Band Stokes Intensity As Function Of Phsupporting

confidence: 93%

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Surface‐enhanced Raman scattering studies of carbon nanotubes using Ag‐core Au‐shell nanoparticles

Kumar

2009

J Raman Spectroscopy

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Surface-enhanced Raman scattering from carbon nanotube bundles adsorbed with plasmon-tunable Ag-core Au-shell nanoparticles (Ag@Au nps) was carried out for the first time. By utilizing nanoparticles whose plasmon resonance peak (541, 642 nm) closely matches the commonly used Raman excitation sources (532, 632.81 nm), we can observe a large enhancement in the Raman signatures of carbon nanotubes. We obtain greater enhancement in the Raman signal for the above case when compared to nanotubes adsorbed with conventional Ag, Au or other 'off resonant' Ag@Au nps. The power-dependent SERS experiment on single-walled nanotubes (SWNTs) with resonant Ag@Au nps reveals a linear behavior between the G-band intensity and the photon flux density, which is in agreement with the vibrational pumping model of SERS. The observed enhancement by resonance matching is pronounced for carbon nanotubes and may lead to insights into understanding nanotube-nanoparticle interaction.

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Section: Linear Behavior Of G Band Stokes Intensity As Function Of Phsupporting

confidence: 93%

“…We observe a narrowing of SERS tangential mode vibration at ∼1590 cm −1 , which is in agreement with the previous reports on SERS of SWNTs. [7,18] Next, with the same excitation wavelength (532 nm), we performed SERS on SWNTs adsorbed with cs604 and cs642 nanoparticles, whose spectra are displayed in Fig. 4.…”

Section: Sers Of Swnt Bundles With Ag@au Npsmentioning

confidence: 99%

Surface‐enhanced Raman scattering studies of carbon nanotubes using Ag‐core Au‐shell nanoparticles

Kumar

2009

J Raman Spectroscopy

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“…This observation of a non-linear dependence of the anti-Stokes intensities with power (resulting in a linear dependence in the aS/Sratio) was thought to provide strong evidence for vibrational pumping in SERS. Further measurements on carbon nanotubes [17] and a DNA-base [21] supported these initial results. The arguments against this original interpretation are summarized in the following subsection.…”

Section: A Brief Description Of Sers Pumpingmentioning

confidence: 69%

“…Optical pumping of vibrational modes was first suggested in 1996 based on the observed dependence of the anti-Stokes/Stokes (aS/S) ratio with incident laser power [13], and it was suggested that this could be a possible tool to estimate SERS cross sections. However, the interpretation of the experimental results have been the subject of considerable debate in the literature, with many authors simply denying its existence and attributing the experimental observations to either laser-heating, resonance effects, or combinations thereof [14,15,16,17]. * Electronic address: Robert.Maher@imperial.ac.uk † Electronic address: Pablo.Etchegoin@vuw.ac.nz…”

Section: Introductionmentioning

confidence: 99%

On the Experimental Estimation of Surface Enhanced Raman Scattering (SERS) Cross Sections by Vibrational Pumping

Maher¹,

Cohen²,

Ru³

et al. 2006

J. Phys. Chem. B

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We present an in-depth analysis of the experimental estimation of cross-sections in surface enhanced raman scattering (SERS) by vibrational pumping. The paper highlights the advantages and disadvantages of the technique, pinpoints the main aspects and limitations, and provides the underlying physical concepts to interpret the experimental results. Examples for several commonly used SERS probes are given, and a discussion on future possible developments is also presented. Obtaining good estimates of SERS cross-sections is, in general, an extremely hard problem and has been a longstanding ambition of the SERS community for reasons that go from the purely applied (quantification of signals) to the more fundamental (comparisons of theoretical electromagnetic enhancement factors with experiment). Any method that can produce a standard protocol for the estimation of cross-sections is, accordingly, of great interest and an effort to understand its principles and limitations is required.

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“…Understanding Stokes and anti‐Stokes Raman light scattering has remained a challenging subject in the study of SWCNTs. Much attention has been paid to the G band of an SWCNT, which under optical excitation (676.4 nm, 1.833 eV) exhibits an asymmetric line that is accompanied by an unusual anti‐Stokes Raman effect that is evaluated by a higher value for the anti‐Stokes/Stokes intensity ratio I aS / I S than provided by the Boltzmann law:

\frac{I_{a S}}{I_{S}} = ((), \frac{σ {((), a_{normalΩ})}_{a S}}{σ {((), a_{normalΩ})}_{S}}) {(\frac{ω_{l} + normalΩ}{ω_{l} - normalΩ})}^{4} exp {(\frac{h normalΩ}{k T})}^{- 1}

where ω l , Ω, h , k and T are the wavenumber of the excitation light, the wavenumber of the Raman line (cm −1 ), the Planck constant, the Boltzmann constant and the temperature, respectively. The terms σ ( α Ω ) aS and σ ( α Ω ) S denote the anti‐Stokes and Stokes cross sections, respectively, associated with the polarizability α at the Ω wavenumber.…”

Section: Resultsmentioning

confidence: 99%

Anti‐Stokes Raman spectroscopy as a method to identify the metallic and semiconducting configurations of double‐walled carbon nanotubes

Baibarac

Baltog

Matea

et al. 2014

J Raman Spectroscopy

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Although Raman spectra reveal, as a signature of double-walled carbon nanotubes (DWCNTs), two radial breathing mode (RBM) lines associated with the inner and outer tubes, the specification of their nature as metallic or semiconducting remains a topic for debate. Investigating the spectral range of the RBM lines, we present a new procedure of the indexing of the semiconducting or metallic nature of the inner and outer shell that forms the DWCNT. The procedure exploits the difference between the intensities of recorded anti-Stokes Raman spectrum and the anti-Stokes spectrum calculated by applying the Boltzmann formulae to the recorded Stokes spectrum. The results indicate that the two spectra do not coincide with what should happen in a normal Raman process, namely, that there are RBM lines of the same intensity in both spectra, as well as RBM lines of higher intensity that are observed in the calculated spectrum. This discrepancy results from the surface-enhanced Raman scattering mechanism that operates differently on metallic or semiconducting nanotubes. In this context, the analysis of the RBM spectrum can reveal pairs of lines associated with the inner/outer shell structure of DWCNT, and when the intensities between the recorded and calculated spectra coincide, the nanotube is metallic; otherwise, the nanotube is semiconducting.

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Surface enhanced resonance Raman scattering from radial and tangential modes of semiconducting single wall carbon nanotubes

Cited by 25 publications

References 35 publications

Surface‐enhanced Raman scattering studies of carbon nanotubes using Ag‐core Au‐shell nanoparticles

Surface‐enhanced Raman scattering studies of carbon nanotubes using Ag‐core Au‐shell nanoparticles

On the Experimental Estimation of Surface Enhanced Raman Scattering (SERS) Cross Sections by Vibrational Pumping

Anti‐Stokes Raman spectroscopy as a method to identify the metallic and semiconducting configurations of double‐walled carbon nanotubes

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