Journal of Raman Spectroscopy

Cover image for Vol. 42 Issue 8

August 2011

Volume 42, Issue 8

Pages 1601–1711

  1. Research Articles

    1. Top of page
    2. Research Articles
    3. Errata
    1. About the SDS inclusion in PDMS/TEOS ORMOSIL: a vibrational spectroscopy and confocal Raman scattering study (pages 1601–1605)

      A. R. Paschoal, A. P. Ayala, R. C. F. Pinto, C. W. A. Paschoal, A. A. Tanaka, J. S. Boaventura Filho and N. M. José

      Version of Record online: 6 APR 2011 | DOI: 10.1002/jrs.2908

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      The organically modified silicates (ORMOSILs) are attractive materials due to their vast applicability and easy synthesis. The doping of these materials with sodium dodecyl sulfate (SDS) is interesting in the search for good protonic conductors. The inclusion of different concentrations of SDS in the ORMOSIL membranes is investigated in the present work using Raman and infrared spectroscopy, confocal Raman microscopy and confocal imaging microscopy. The spectroscopic measurements allowed us to assign the vibrational modes to the chemical groups of the structures of SDS and ORMOSIL. Furthermore, these measurements show that these materials are composites, as no interactions are observed between the SDS and the ORMOSIL matrix. The confocal Raman and confocal imaging techniques are useful to study qualitatively the SDS insertion in ORMOSIL. We observed that the SDS sizes are very irregular.

    2. Drop-coating deposition Raman spectroscopy of liposomes (pages 1606–1610)

      Eva Kočišová and Marek Procházka

      Version of Record online: 28 MAR 2011 | DOI: 10.1002/jrs.2915

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      Drop-coating deposition Raman (DCDR) spectroscopy was tested as a potential technique for studying liposomes (phosphatidylcholine and asolectin) at very low sample concentrations. Our results suggest that DCDR spectroscopy can be used for studying lipids in situ, and that the sensitivity of this technique is at least two orders of magnitude higher than that of conventional Raman microscopy.

    3. Raman G-mode of single-wall carbon nanotube bundles under pressure (pages 1611–1613)

      Ahmad J. Ghandour, David J. Dunstan and Andrei Sapelkin

      Version of Record online: 23 FEB 2011 | DOI: 10.1002/jrs.2905

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      The results from high-pressure Raman experiments on carbon nanotubes are not always as expected. The behaviour of the G-mode under pressure is an example of this diversity. In this study, we show that tubes that are resonant—which is altered under pressure—are crucial for understanding the outcome of high-pressure experiments.

    4. Charge-dependent adsorption of rhodamine 6G on gold nanoparticle surfaces: fluorescence and Raman study (pages 1614–1619)

      Erdene-Ochir Ganbold, Jin-Ho Park, Uuriintuya Dembereldorj, Kwang-Su Ock and Sang-Woo Joo

      Version of Record online: 23 FEB 2011 | DOI: 10.1002/jrs.2907

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      Different adsorption behaviors of rhodamine 6G depending on the surface charges of gold nanoparticles (Au NPs) suggest that the detection of Au concentrations may be possible for the negatively charged Au NPs using fluorescence and Raman measurements.

    5. Softening behavior of acoustic phonon mode in ZnO nanoparticles: the effect of impurities and particle size variation with temperature (pages 1620–1625)

      Harish Kumar Yadav, K. Sreenivas, R. S. Katiyar and Vinay Gupta

      Version of Record online: 23 FEB 2011 | DOI: 10.1002/jrs.2901

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      Decay dynamics of the acoustic modes in ZnO nanoparticles has been investigated. The anharmonic decay process was found to be responsible for the softening of the acoustic mode only at lower temperatures (T < 500 K), whereas at higher temperatures (>600 K) growth of nanoparticles due to the coalescence sintering process becomes prominent and governs the peak shift toward the Rayleigh line. The precursors induce an anomalous softening in the decay dynamics, revealing the damping of the phonon mode at specific temperatures.

    6. Micro-Raman spectroscopic investigations of mineral assemblages in parallel to bedding laminae in 2.9 Ga sandstones of the Pongola Supergroup, South Africa (pages 1626–1633)

      Dina M. Bower

      Version of Record online: 28 MAR 2011 | DOI: 10.1002/jrs.2903

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      Laminated sandstones from the 2.9 Ga Pongola Supergroup, South Africa, were characterized using micro-Raman spectral imaging to elucidate the origin of the mineral components. The laminations consist of elongated muscovite grains that are intimately associated with anatase, rutile, goethite, and graphitic carbon. The spatial relationships among the components were easily visualized by mapping specific areas in the laminations using this technique.

    7. Micro-Raman investigation of tin dioxide nanostructured material based on annealing effect (pages 1634–1639)

      P. Sangeetha, V. Sasirekha and V. Ramakrishnan

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2919

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      Micro-Raman spectral studies on SnO2 nanocrystalline material were carried out to determine its Raman active vibrational modes at 633 (A1g), 475 (Eg) and 775 cm−1 (B2g). From our investigation, the observed blue shift of the A1g phonon peak is strongly related to the size effect as the crystallite size increases with the annealing temperature.

    8. Absorption and resonance Raman spectroscopy of the 1Bu state of trans-1,3,5-hexatriene including vibronic coupling (pages 1640–1652)

      M. Dehestani and E. Akbari

      Version of Record online: 31 MAR 2011 | DOI: 10.1002/jrs.2904

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      A model consisting of two electronic states coupled by two vibrational modes is applied to describe the vibronic coupling between the first excited S1(2Ag) and the second excited S2(1Bu) singlet electronic states of the trans-1,3,5-hexatriene molecule. The model is formulated by perturbation theory, which treats the intramolecular couplings in a perturbative manner with a diabatic basis so that the non-Condon corrections are included. The time-correlation function formalism has been used to calculate absorption and resonance Raman cross sections.

    9. Characterization of the products of aniline peroxydisulfate oligo/polymerization in media with different pH by resonance Raman spectroscopy at 413.1 and 1064 nm excitation wavelengths (pages 1653–1659)

      Claudio H. B. Silva, Daniela C. Ferreira, Vera R. L. Constantino and Marcia L. A. Temperini

      Version of Record online: 23 FEB 2011 | DOI: 10.1002/jrs.2898

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      Resonance Raman spectra at 413.1 nm reveal that the products of aniline peroxydisulfate reaction in media of pH above 5 are a mixture in which the major compounds are 1,4-Michael-type adducts of aniline monomers and 1,4-benzoquinone-monoimine unit and their hydrolysis products. Even in alkaline media, the formation of a minor content of PANI in the emeraldine salt form was shown by the resonance Raman technique at 1064 nm.

    10. Resonant Raman scattering in CdSxSe1−x nanocrystals: effects of phonon confinement, composition, and elastic strain (pages 1660–1669)

      E. S. Freitas Neto, S. W. da Silva, P. C. Morais, M. I. Vasilevskiy, M. A. Pereira-da-Silva and N. O. Dantas

      Version of Record online: 2 MAY 2011 | DOI: 10.1002/jrs.2918

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      Experimental resonant Raman scattering (RRS) spectra of CdSxSe1−x nanocrystal (NC) quantum dots grown in a glass matrix were described rather well by the continuous lattice dynamics model (based on concept of propagating optical phonons), including the line shape and polarization dependence of the scattering intensity. Even though the presence of a compressive strain in the NCs (introduced by the matrix) masks the expected downward shift owing to the phonons' spatial quantization, the asymmetric broadening of both Raman peaks is similar to that characteristic of NCs of pure binary materials.

    11. Raman spectroscopy of acetic acid monomer and dimers isolated in solid argon (pages 1670–1681)

      Adriana Olbert-Majkut, Jussi Ahokas, Jan Lundell and Mika Pettersson

      Version of Record online: 31 MAR 2011 | DOI: 10.1002/jrs.2909

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      Acetic acid monomer and its dimers were studied by Raman spectroscopy combined with the matrix isolation technique. The approach has yielded new insight on the AA monomer and different dimer structures. Density functional theory computations are used to support the experimental results.

    12. Synthesis and Raman spectroscopic investigation of a new self-assembly monolayer material 4-[N-phenyl-N-(3-methylphenyl)-amino]-benzoic acid for organic light-emitting devices (pages 1682–1689)

      M. Kurt, S. Okur, S. Demic, J. Karpagam and N. Sundaraganesan

      Version of Record online: 23 FEB 2011 | DOI: 10.1002/jrs.2910

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      We have synthesized 4-[N-phenyl-N-(3-methylphenyl)-amino]-benzoic acid (4-[PBA]) and investigated its molecular vibrations by infrared and Raman spectroscopies as well as by calculations based on the density functional theory approach. Stability of the molecule arising from hyperconjugative interactions and charge delocalization have been analyzed using natural bond orbital analysis. Selected experimental bands were assigned and characterized based on the scaled theoretical wavenumbers by their total energy distribution.

    13. Raman spectroscopic study of the magnesium carbonate mineral hydromagnesite (Mg5[(CO3)4(OH)2]· 4H2O) (pages 1690–1694)

      Ray L. Frost

      Version of Record online: 31 MAR 2011 | DOI: 10.1002/jrs.2917

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      Magnesium carbonate minerals are important for the understanding of the concept of geosequestration. A combination of Raman and infrared spectroscopy has been used to study the hydrated hydroxy carbonate mineral hydromagnesite.

    14. Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe2O4 system (pages 1695–1700)

      Y. Hou, Y. P. Yao, S. N. Dong, M. L. Teng, X. F. Sun and X. G. Li

      Version of Record online: 19 APR 2011 | DOI: 10.1002/jrs.2916

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      The phonon spectra and structural characteristics of polycrystalline LuFe2O4 system were investigated. Two step-like anomalies of the peak wavenumbers in vibrational spectra, as well as some weak anomalies of the lattice parameters, are found around the ferrimagnetic and ferroelectric transition temperatures. These results illustrate that the structural fluctuations could effectively influence the phonon modes, and a possible interplay among the structural, magnetic, and charge-ordering properties exists in this multiferroic system.

    15. A Raman spectroscopic study of the different vanadate groups in solid-state compounds—model case: mineral phases vésigniéite [BaCu3(VO4)2(OH)2] and volborthite [Cu3V2O7(OH)2·2H2O] (pages 1701–1710)

      Ray L. Frost, Sara J. Palmer, Jiří Čejka, Jiří Sejkora, Jakub Plášil, Silmarilly Bahfenne and Eloise C. Keeffe

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2906

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      Raman spectroscopy has been used to study vanadates in the solid state. Distinction is made between the vanadate (VO43−) and pyrovanadate anions (V2O74−) using Raman spectroscopy. The Raman spectra are related to the molecular structure of the minerals.

  2. Errata

    1. Top of page
    2. Research Articles
    3. Errata
    1. You have free access to this content
      Erratum: In vitro analysis of immersed human tissues by Raman microspectroscopy (page 1711)

      F. Bonnier, A. Mehmood, P. Knief, A. D. Meade, W. Hornebeck, H. Lambkin, K. Flynn, V. McDonagh, C. Healy, T. C. Lee, F. M. Lyng and H. J. Byrne

      Version of Record online: 2 AUG 2011 | DOI: 10.1002/jrs.3037

      This article corrects:

      In vitro analysis of immersed human tissues by Raman microspectroscopy

      Vol. 42, Issue 5, 888–896, Version of Record online: 4 NOV 2010