Journal of Raman Spectroscopy

Cover image for Vol. 42 Issue 7

July 2011

Volume 42, Issue 7

Pages 1489–1600

  1. Research Articles

    1. Top of page
    2. Research Articles
    1. Continuous wave stimulated Raman scattering of benzene by fluorescence enhancement in hollow fused silica fiber (pages 1489–1491)

      Zhiwei Men, Guannan Qu, Wenhui Fang, Xiuping Sun, Anyang Cao, Zuowei Li, Chenglin Sun, Shuqin Gao and Guohui Lu

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2890

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      We present CW SRS of C6H6 influenced by the fluorescence dye m-cresol purple in a hollow fused silica fiber (HFSF). Because of the transmission loss of the HFSF filled with C6H6, the SRS occurs where the Stokes gain equals the transmission loss, with loss taken at the Stokes wavelength. The 992 cm−1 stimulated Stokes line has been obtained at the pump wavelength 658 nm, which cannot be obtained at 532 nm because the Stokes wavelength (562 nm) does not locate in the transmission loss. The profile of 992 cm−1 stimulated Stokes line has been changed.

    2. SERS detection of proteins on micropatterned protein-mediated sandwich substrates (pages 1492–1496)

      Weidong Ruan, Wei Ji, Xiangxin Xue, Yang Cui, Lei Chen, Tieli Zhou, Li Niu, Xiao Li, Junhu Zhang and Bing Zhao

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2892

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      Surface-enhanced Raman scattering (SERS) technique was employed as a platform to detect micropatterned protein-mediated Au/Ag sandwich substrates. The resulting spectra showed high sensitivity and good resolution. The results indicate that SERS is a powerful tool in the detection of proteins and has great potential application in protein chips.

    3. Raman, infrared, SERS and theoretical study of 3-(1-phenylpropan-2-ylamino) propanenitrile, fenproporex (pages 1497–1504)

      Guillermo Diaz Fleming, Freddy Célis, Marcelo Campos-Vallette, Alvaro E. Aliaga, Marcela Escobar and Rainer Koch

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2882

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      The use of Raman and SERS spectroscopy in combination with computational methods indicates that fenproporex is interacting with the metallic surface mainly through its nitrile group. In addition to an electromagnetic mechanism, a partial charge transfer is also considered for the SERS enhancement.

    4. Photodissociation effects on pulsed laser deposited silver oxide thin films: surface-enhanced resonance Raman scattering (pages 1505–1509)

      N. Ravi Chandra Raju and K. Jagadeesh Kumar

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2895

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      Photo-dissociation studies were performed on silver oxide thin films using Raman spectrometer at three different excitation wavelengths. Observed emission lines (1336 cm−1 and 1596 cm−1) were explained using SERRS.

    5. Micro-Raman investigation of nanosized zinc ferrite: effect of crystallite size and fluence of irradiation (pages 1510–1517)

      Jitendra Pal Singh, R. C. Srivastava, H. M. Agrawal and Ravi Kumar

      Article first published online: 17 MAR 2011 | DOI: 10.1002/jrs.2902

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      A micro-Raman study was carried out for studying the irradiation-induced effects in zinc ferrite nanoparticles of different sizes. It has been observed that pristine nanoparticles exhibit phonon confinement, while irradiated nanoparticles deviate from this effect. Furthermore, the irradiation-induced changes in the system depend on the phonon confinement length.

    6. Involvement of weak C[BOND]H···X hydrogen bonds in metal-to-semiconductor regime change in one-dimensional organic conductors (o-DMTTF)2X (X = Cl, Br, and I): combined IR and Raman studies (pages 1518–1527)

      Damian Jankowski, Roman Świetlik, Eric W. Reinheimer and Marc Fourmigué

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2889

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      The metal-to-semiconducting regime change in one-dimensional organic metals (o-DMTTF)2X (X = Cl, Br, and I) is correlated with subtle modifications of IR and Raman vibrational features, related not only to C[DOUBLE BOND]C and C[BOND]S stretching but also to C[BOND]H bending modes of methyl groups, associated with intermolecular C[BOND]H···X hydrogen bonds.

    7. SVD-based method for intensity normalization, background correction and solvent subtraction in Raman spectroscopy exploiting the properties of water stretching vibrations (pages 1528–1539)

      Jan Palacký, Peter Mojzeš and Jiří Bok

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2896

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      A semiautomated method combining intensity normalization with effective elimination of the solvent signal and non-Raman background is presented for Raman spectra of analytes in aqueous solutions. The method is suitable for rapid and effortless preprocessing of extensive datasets taken as a function of gradually varied physicochemical parameters. For intensity normalization, Raman OH stretching band of water is employed as the internal intensity standard. Accuracy, reliability and robustness of the method were tested under the conditions of spontaneous Raman, resonance Raman and surface-enhanced Raman scattering.

    8. Composition and authentication of virgin olive oil from French PDO regions by chemometric treatment of Raman spectra (pages 1540–1547)

      R. Korifi, Y. Le Dréau, J. Molinet, J. Artaud and N. Dupuy

      Article first published online: 28 MAR 2011 | DOI: 10.1002/jrs.2891

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      The search for the origin and the authenticity of virgin olive oils is a problem of topical interest. We report here an evaluation of the capability of confocal Raman spectroscopy combined with chemometric treatments for determining the fatty acid and triacylglycerol compositions of olive oils and for the authenticating French virgin olive oils into protected designation of origin (PDO) labels.

    9. Fourier-transform Raman analysis of milk powder: a potential method for rapid quality screening (pages 1548–1552)

      Mariana R. Almeida, Kamila de S. Oliveira, Rodrigo Stephani and Luiz Fernando C. de Oliveira

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2893

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      The novelty of this work is that this is the first investigation concerning the use of Raman spectroscopy in the evaluation of the presence of extraneous constituents in milk powder, such as whey, as well as the identification by chemometric methods of different types of milk, such as whole, low fat, and skimmed milk. These tools allow the quick analysis of milk samples without the use of reagents that are typically necessary for conventional colorimetric or HPLC methods.

    10. Identification of Raman spectra through a case-based reasoning system: application to artistic pigments (pages 1553–1561)

      M. Castanys, R. Perez-Pueyo, M. J. Soneira, E. Golobardes and A. Fornells

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2888

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      A three-phase methodology to systematically identify Raman spectra through the case-based reasoning system is presented. The system is able to resolve the identification of a spectrum by using specific knowledge of previous experiences (well-known spectra library of patterns) and finding the most similar past cases (patterns), reusing and adapting them to the new problem situation (unknown spectrum). Principal component analysis, similarity measures and fuzzy logic are used to objectively identify Raman spectra, thus offering a decision support tool.

    11. High-pressure Raman spectroscopic and other structural studies of hydrotalcites containing intercalated dicarboxylic acid anions (pages 1562–1566)

      Josh Wright, Mirela M. Barsan, Ian S. Butler, Denis F. R. Gilson, Moses O. Adebajo and Ray L. Frost

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2881

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      Dicarboxylic acid anions intercalated in layered double hydroxides (LDHs) orient perpendicular to the hydroxide layer for short chains (n≤4) and are tilted for longer chains. No pressure-induced phase transitions were observed up to 4.6 GPa and 13C-NMR spectra show that the intercalated molecules are rigid at room temperature.

    12. Phase transitions in Pb8O5(XO4)2 (X = As and V) compounds (pages 1567–1573)

      E. A. Oliveira, E. N. Silva, A. R. Paschoal, S. M. Dantas, I. Guedes, J. Mendes-Filho, G. Polla and A. P. Ayala

      Article first published online: 2 MAR 2011 | DOI: 10.1002/jrs.2886

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      Raman spectroscopy, polarized microscopy and thermal analysis were used to investigate the sequence of phase transition in the lead oxide salts Pb8O5(XO4)2 (X = As and V). A new structural phase transition was observed in Pb8O5(AsO4)2 at 500 K exhibiting a second-order character. At room temperature, the domain pattern was investigated by Raman microscopy.

    13. Origin of the Raman mode at 379 cm−1 observed in ZnO thin films grown on sapphire (pages 1574–1577)

      A. Souissi, A. Marzouki, A. Sayari, V. Sallet, A. Lusson and M. Oueslati

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2887

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      In this work, we present a detailed Raman scattering study to clarify the origin of the mode at 379 cm−1 that is observed in Raman spectra of the ZnO films grown on c-sapphire substrates and generally attributed to the A1-transverse optical (TO) mode of ZnO. The studied ZnO films were deposited by metal-organic chemical vapor deposition on c-sapphire and (0001) ZnO substrates. In z(−,−)z backscattering configuration, the A1-TO mode of ZnO is forbidden, but the 379 cm−1 peak is still observed in the as-deposited film grown on the sapphire substrate. The effects of substrate, annealing temperature and time and collection cross-section on Raman active modes have been characterized. We showed that the peak at 379 cm−1 is the E1g mode of the sapphire substrate.

    14. Raman spectroscopy of sol–gel derived titanium oxide thin films (pages 1578–1582)

      Xiaodong Wang, Jun Shen and Qiang Pan

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2899

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      UV and visible Raman spectroscopy techniques were used to study the phase transition of sol–gel derived TiO2 films. The process of phase transition of films annealed by different methods and powders are compared by their Raman spectra. The resonance Raman effect and different phase transformations are discussed.

    15. Raman scattering of MnOx[BOND]CeOx composite catalysts: structural aspects and laser-heating effects (pages 1583–1588)

      Barbara Fazio, Lorenzo Spadaro, Giuseppe Trunfio, Jacopo Negro and Francesco Arena

      Article first published online: 17 MAR 2011 | DOI: 10.1002/jrs.2897

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      A nanostructured composite MnOx[BOND]CeOx catalyst was synthesized via the redox[BOND]precipitation route in comparison to the classical co-precipitation method and characterized by XRD and micro-Raman spectroscopy measurements under different cycles of laser irradiation power (0.6 [RIGHTWARDS ARROW] 4.2 [RIGHTWARDS ARROW] 0.6 [RIGHTWARDS ARROW] 4.2 mW). The new material appears mostly as an amorphous system where MnOx and CeO2 phases are mixed at the near-molecular level. Laser heating effects on Raman spectra highlight structural modifications linked to the architecture and the oxide dispersion of the MnOx[BOND]CeOx system.

    16. Raman spectroscopic study of the minerals diadochite and destinezite Fe3+2(PO4,SO4)2(OH)· 6H2O: implications for soil science (pages 1589–1595)

      Ray L. Frost and Sara J. Palmer

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2883

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      The two minerals diadochite and destinezite of formula Fe3+2(PO4,SO4)2(OH)· 6H2O have been characterised by Raman spectroscopy. The spectra of diadochite are broad and ill defined, whereas the spectra of destinezite are intense and well defined. Bands are assigned to phosphate and sulfate stretching and bending modes.

    17. A Raman spectroscopic study of bukovskýite Fe2(AsO4)(SO4)(OH)· 7H2O, a mineral phase with a significant role in arsenic migration (pages 1596–1600)

      Jan Loun, Jiří Čejka, Jiří Sejkora, Jakub Plášil, Milan Novák, Ray L. Frost, Sara J. Palmer and Eloise C. Keeffe

      Article first published online: 23 FEB 2011 | DOI: 10.1002/jrs.2900

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      The Raman spectrum of bukovskýite [Fe3+2(OH)(SO4)(AsO4)· 7H2O] has been studied and compared with the Raman spectrum of an amorphous gel containing specifically Fe, As and S elements, which is understood as an intermediate product in the formation of bukovskýite.