Journal of Raman Spectroscopy

Cover image for Vol. 42 Issue 9

September 2011

Volume 42, Issue 9

Pages 1713–1824

  1. Research Articles

    1. Top of page
    2. Research Articles
    1. Experimental parameters for the SERS of nitrate ion for label-free semi-quantitative detection of proteins and mechanism for proteins to form SERS hot sites: a SERS study (pages 1713–1721)

      Zhen Zhou, Genin Gary Huang, Tomoki Kato and Yukihiro Ozaki

      Version of Record online: 2 MAY 2011 | DOI: 10.1002/jrs.2927

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      Experimental parameters on SERS intensities of NO3 and proteins were explored by a heat-induced SERS method. Two possible mechanisms for proteins to form SERS hot sites during the sample preparations are proposed. Samples prepared by the heat-induced SERS method are so stable that they can be used as a standard and transferred to different laboratories for direct comparison.

    2. Surface-enhanced Raman scattering and DFT calculations studies of 3,3′-diethylthiatri- carbocyanine iodide (pages 1722–1727)

      Hongxing Cai, Jing Zhu, Gao Chen, Liwei Liu, Guang S. He and Xihe Zhang

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2929

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      Ordinary Raman, SERS, and theoretical Raman spectra of DTTC are given. Good agreement was obtained between the theoretical and experimental results. Vibrational modes were assigned to all bands between 500 and 3100 cm−1, and the molecule is thought to be physisorbed on the Au-NP surface by the N atom in the pyrrol with a perpendicular geometry.

    3. SERS detection of explosive agent by macrocyclic compound functionalized triangular gold nanoprisms (pages 1728–1735)

      Jing Yao Xu, Jin Wang, Ling Tao Kong, Guang Chao Zheng, Zheng Guo and Jin Huai Liu

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2932

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      Because the three sharp vertices of triangular gold nanoprisms are favorable for improving optical properties of anisotropic nanostuctures, they have been selected as SERS substrates for the detection of an explosive agent. Moreover, thiolated CD without alkyl chain was used for decorating these gold nanoprisms so as to efficiently accumulate the target molecules. Based on the hybridized SERS substrates, highly efficient sensing of DNT is achieved.

    4. SERS enhancement of gold nanospheres of defined size (pages 1736–1742)

      Virginia Joseph, Andrea Matschulat, Jörg Polte, Simone Rolf, Franziska Emmerling and Janina Kneipp

      Version of Record online: 6 APR 2011 | DOI: 10.1002/jrs.2939

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      Monodisperse citrate-stabilized gold nanoparticles of defined sizes ranging from 15 to 40 nm were used to determine the size dependence of the enhancement factor in SERS. The results are in good agreement with previous theoretical predictions.

    5. Phase-locking of two independent degenerate coherent anti-Stokes Raman scattering processes: concept, proposed all-optical implementation, and potential applications (pages 1743–1746)

      Qun Zhang

      Version of Record online: 31 MAR 2011 | DOI: 10.1002/jrs.2923

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      A novel approach toward phase-locking of two independently produced yet energetically degenerate coherent anti-Stokes Raman scattering (CARS) processes is put forward. The proposed all-optical implementation involves a modified Mach–Zehnder interferometer, which is utilized to transfer phase coherence from three totally uncorrelated laser beams into two degenerate CARS beams that are produced in two distinct Raman active samples.

    6. CARS diagnostics of fluid adsorption and condensation in small mesopores (pages 1747–1753)

      O. V. Andreeva, V. G. Arakcheev, V. N. Bagratashvili, V. B. Morozov, V. K. Popov and A. A. Valeev

      Version of Record online: 16 JUN 2011 | DOI: 10.1002/jrs.2979

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      Coherent anti-Stokes Raman scattering (CARS) spectroscopy is applied to diagnostics of phase behavior of a fluid confined in cylindrical pores with diameter of several nanometers. The specific transformations of the molecular spectra profiles observed experimentally are in a good agreement with the results of calculations performed on the basis of surface adsorption and capillary condensation. Relying on the analysis presented, CARS technique is argued to be convenient for the characterization of nanoporous host structure.

    7. A novel combinative Raman and SEM mapping method for the detection of exfoliation of graphite in electrodes at very positive potentials (pages 1754–1760)

      Andreas Hintennach and Petr Novák

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2930

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      The random exfoliation of graphite at very positive potentials was investigated with in situ Raman microscopy and postmortem scanning electron microscopy. A novel semiautomated computational method for the data analysis of both characterization methods was developed.

    8. Improved blind-source separation for spectra (pages 1761–1768)

      Christopher J. Rowlands and Stephen R. Elliott

      Version of Record online: 31 MAR 2011 | DOI: 10.1002/jrs.2936

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      We present a new method for the automated separation of overlapping Raman spectra, or ‘blind-source separation’. Despite the relative novelty of algorithms that are capable of performing blind-source separation, this new method both outperforms the current state-of-the-art methods under certain circumstances, and is conceptually simple to implement. We demonstrate the performance of the new method under a wide range of different simulated spectra, as well as several real-world examples.

    9. Frohlich interaction and associated resonance enhancement in nanostructured copper oxide films (pages 1769–1773)

      N. A. Mohemmed Shanid, M. Abdul Khadar and V. G. Sathe

      Version of Record online: 11 MAY 2011 | DOI: 10.1002/jrs.2945

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      Micro-Raman spectroscopic investigations of nanostructured copper oxide films were carried out by 633 and 488 nm excitations to study the resonant Raman behavior of the samples. Enhancement of forbidden Raman modes of Cu2O phase is explained with the support of bandgap energy values and Frohlich interaction.

    10. Raman scattering studies of hexagonal rare-earth RMnO3 (R = Tb, Dy, Ho, Er) thin films (pages 1774–1779)

      Nguyen Thi Minh Hien, Su-Young Oh, Xiang-Bai Chen, D. Lee, S.-Y. Jang, T. W. Noh and In-Sang Yang

      Version of Record online: 6 APR 2011 | DOI: 10.1002/jrs.2925

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      We have studied the rare-earth R dependence of the phonon and magnon scattering in hexagonal RMnO3 (R = Tb, Dy, Ho, Er) thin films using Raman scattering spectroscopy. We found, as the R ionic radius decreases from Tb to Er, the phonons shift to higher energies. Our results indicate that both the lattice constants a and c of hexagonal RMnO3 would decrease when the R ionic radius decreases, and the lattice constant c would have a weaker R dependence. The magnons also shift to higher energies when the radius of the R ion decreases, and they show faster upshift than the phonons. In addition, the Néel temperature also shows a systematic increase when the radius of the R ion decreases. The rare-earth R dependence of the magnons and the Néel temperature can be explained by the rapid increase of the spin-exchange integral when the Mn-Mn distance decreases.

    11. Micro-Raman characterization of laser-induced local thermo-oxidation of thin chromium films (pages 1780–1783)

      A. V. Baranov, K. V. Bogdanov, A. V. Fedorov, M. V. Yarchuk, A. I. Ivanov, V. P. Veiko and K. Berwick

      Version of Record online: 28 MAR 2011 | DOI: 10.1002/jrs.2920

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      Micro-Raman spectroscopy is applied to the characterization of the chemical composition and topography of protective oxide layers formed on the surface of thin chromium films by focused sub-picosecond pulsed laser radiation.

    12. Quantitative detection of adulterated olive oil by Raman spectroscopy and chemometrics (pages 1784–1788)

      Xiao-Fang Zhang, Ming-Qiang Zou, Xiao-Hua Qi, Feng Liu, Cheng Zhang and Feng Yin

      Version of Record online: 2 MAY 2011 | DOI: 10.1002/jrs.2933

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      Raman spectrometry approach was employed to detect soybean oil, sunflower seed oil and corn oil adulterated in extra virgin olive oil. Based on the Raman spectra of the extra virgin olive oil samples with different mass percentages, the external standard method was used for quantitative analysis.

    13. Using Raman spectroscopy as a tool for the detection of iron in glass (pages 1789–1795)

      K. Baert, W. Meulebroeck, H. Wouters, P. Cosyns, K. Nys, H. Thienpont and H. Terryn

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2935

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      Raman spectroscopy was used to identify iron-containing glasses. This nondestructive technique offers a fast method to obtain qualitative information about the presence of iron oxides in glass. The effect of the iron content in glass samples is reflected on the topology of the Raman spectra: a strong link between the ratio of the Q2/Q3 vibration units of the silica tetrahedral structure is seen. If matrix effects are taken into account, also (semi)quantitative results can be obtained from calibration lines. Different series of glasses of various origins (ancient and modern/industrial glass) have been considered.

    14. Polarization-dependent Raman spectroscopy of LiBH4 single crystals and Mg(BH4)2 powders (pages 1796–1801)

      Florian Gebert, Britta Willenberg, Michiel J. van Setten, Elisa G. Bardají, Eva Roehm, Maximilian Fichtner and Joachim Schoenes

      Version of Record online: 11 MAY 2011 | DOI: 10.1002/jrs.2934

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      Polarization dependent Raman spectroscopy is applied for the investigation of the complex hydrides Lithium- and Magnesiumborohydride. This method has led to the revision of some former assignments made from Raman measurements and serves as a substantial tool for investigating the Raman active phonons of complex hydrides.

    15. Raman investigations of Zn1−xCoxO nanocrystals: role of starting precursors on vibrational properties (pages 1802–1807)

      Richa Bhargava, Prashant K. Sharma, Sanjeev Kumar, Avinash C. Pandey and Naresh Kumar

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2924

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      The Raman spectra of pure ZnO and Co-doped ZnO show the change with starting precursor as well as with Co-concentration

    16. Analysis of the chromite inclusions found in nephrite minerals obtained from different deposits using SEM-EDS and LRS (pages 1808–1811)

      Z. W. Zhang and F. X. Gan

      Version of Record online: 2 MAY 2011 | DOI: 10.1002/jrs.2963

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      Archaeological studies benefit from the use of a range different techniques, especially those that are non-destructive. We here report on a first tentative approach to analyse the chromite inclusions found in samples of nephrite obtained from different deposits using scanning electron microscopy with energy dispersive spectrometer (SEM-EDS) and laser Raman spectroscopy (LRS). We discuss the shifts in wavenumbers of the peaks as revealed by LRS, as well as the difference in the chemical compositions as obtained using SEM-EDS.

    17. Spectroscopic investigations and computational study of sulfur trioxide–pyridine complex (pages 1812–1819)

      P. L. Anto, Ruby John Anto, Hema Tresa Varghese, C. Yohannan Panicker, Daizy Philip, Gustavo F. S. Andrade and Alexandre G. Brolo

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2928

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      IR, Raman and SERS spectra of sulfur trioxide-pyridine complex were recorded and analyzed. The vibrational wavenumbers of the title compound were computed using the HF/6-31G* basis and compared with the experimental data. The presence of strong pyridine ring vibrations in the SERS spectrum reveals the interaction between the pyridine ring and the metal surface. The molecular plane assumes a tilted orientation with respect to the silver surface.

    18. High-pressure studies of the micro-Raman spectra of iron cyanide complexes: Prussian blue (Fe4[Fe(CN)6]3), potassium ferricyanide (K3[Fe(CN)6]), and sodium nitroprusside (Na2[Fe(CN)5(NO)]·2H2O) (pages 1820–1824)

      Mirela M. Barsan, Ian S. Butler, Jessica Fitzpatrick and Denis F. R. Gilson

      Version of Record online: 1 APR 2011 | DOI: 10.1002/jrs.2931

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      The pressure dependences of the Raman features of Prussian blue, potassium ferricyanide, and sodium nitroprusside have been measured up to 5.0 GPa. The negative dν/dP values observed for the low wavenumber modes in Prussian blue may indicate negative thermal expansion properties. A pressure-induced phase transition was observed for potassium ferricyanide. Strong interactions occur between vibrations of the NC[BOND]Fe[BOND]NO group of atoms.