Journal of Raman Spectroscopy

Cover image for Vol. 46 Issue 4

Early View (Online Version of Record published before inclusion in an issue)

Impact Factor: 2.519

ISI Journal Citation Reports © Ranking: 2013: 14/44 (Spectroscopy)

Online ISSN: 1097-4555

VIEW

  1. 1 - 20
  2. 21 - 40
  3. 41 - 47
  1. Research articles

    1. New advancements in SERS dye detection using interfaced SEM and Raman spectromicroscopy (μRS)

      Sergey V. Prikhodko, Diana C. Rambaldi, Andrew King, Elizabeth Burr, Vanessa Muros and Ioanna Kakoulli

      Article first published online: 5 MAY 2015 | DOI: 10.1002/jrs.4710

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      The identification of organic compounds in complex samples using SERS can be challenging owing to the difficulty to identify proper areas on the sample for robust SERS analysis using optical systems. Scanning electron microscopy (SEM) interfaced with Raman spectromicroscopy (μRS) provides an ideal hyphenated system to overcome this challenge. In this paper we demonstrate the potential of a system interfacing SEM and μRS for single fiber, extractionless analysis in the characterization of dyes from reference collections and archaeological textiles.

  2. Short communications

    1. Raman spectroscopy of pyrite in marble from Chillagoe, Queensland

      Andrés López and Ray L. Frost

      Article first published online: 29 APR 2015 | DOI: 10.1002/jrs.4699

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      Samples of marble from Chillagoe, North Queensland have been analysed using electron microscopy with energy dispersive X-ray spectroscopy (EDS) and Raman spectroscopy. Raman spectroscopy identifies the presence of pyrite in black marble.

  3. Research articles

    1. Quantitative detection of captopril in tablet and blood plasma samples by the combination of surface-enhanced Raman spectroscopy with multiplicative effects model

      Si-Yu Long, Zeng-Ping Chen, Yao Chen and Ru-Qin Yu

      Article first published online: 29 APR 2015 | DOI: 10.1002/jrs.4698

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      With p-thiocresol as internal standard, accurate quantitative analysis of captopril in tablet and blood plasma samples was achieved by surface-enhanced Raman spectroscopy in combination with the multiplicative effects model. The recovery rates were in the range of 94.3% to 109.8%, which were comparable to the results of LC-MS/MS.

    2. Joint Raman spectroscopic and quantum chemical analysis of the vibrational features of Cs2RuO4

      M. Naji, F. Di Lemma, A. Kovács, O. Beneš, D. Manara, J.-Y. Colle, G. Pagliosa, P. Raison and R. J. M. Konings

      Article first published online: 28 APR 2015 | DOI: 10.1002/jrs.4705

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      Comparison of the experimental Raman spectrum of solid Cs2RuO4 (bottom) with the calculated ones of the models RuO42−, Cs2RuO4, and Cs4RuO42+. Ball and stick drawing of different models.

    3. Assessment of ex vivo perfused liver health by Raman spectroscopy

      Theresah N. K. Zu, Ahmad I. M. Athamneh, Eva Collakova, John Robertson, Thomas Hawken, Charles Aardema and Ryan S. Senger

      Article first published online: 28 APR 2015 | DOI: 10.1002/jrs.4688

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      Raman spectroscopy was used to monitor the health of livers being perfused ex vivo in order to extend their useful lives for transplantation. When combined with multivariate statistical analyses, the technique was able to show organ degradation over time and was capable of identifying altered degradation rates under different perfusion pressures and temperatures. Raman spectroscopy shows promise as a diagnostic tool for monitoring the health of transplantable organs in near real-time.

    4. Modification in structure of La and Nd co-doped epitaxial BiFeO3 thin films probed by micro Raman spectroscopy

      Anju Ahlawat, S. Satapathy, V. G. Sathe, R. J. Choudhary, M. K. Singh, Ravi Kumar, T. K. Sharma and P. K. Gupta

      Article first published online: 28 APR 2015 | DOI: 10.1002/jrs.4701

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      Raman spectroscopy has been used to study the structural phase transition in La, Nd co-doped BiFeO3 films (Bi0.8La0.1Nd0.1FeO3) grown on SrTiO3 (001) substrate. Based on the group theoretical analysis of number and symmetry of Raman lines, the polarization dependent Raman studies provide strong experimental evidence that the structure has been changed from rhombohedral to monoclinic due to doping in BiFeO3. The structural transformation in BiFeO3 might lead to the suppression of spatially non uniform structure resulting in the improvement of magnetic properties.

    5. Infrared versus light scattering techniques to monitor the gel to liquid crystal phase transition in lipid membranes

      Paola Sassi, Silvia Caponi, Maria Ricci, Assunta Morresi, Harriëtte Oldenhof, Willem F. Wolkers and Daniele Fioretto

      Article first published online: 27 APR 2015 | DOI: 10.1002/jrs.4702

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      Collective properties of lipid systems are explored by Fourier transform infrared (FTIR), Raman, and Brillouin scattering techniques. The effects of dehydration and interaction with trehalose are monitored in the temperature range of lipid phase transition. While FTIR permits a more precise evaluation of the melting temperature, Raman spectra are more suitable to simultaneously study both lipid and water contributions. Brillouin spectroscopy is also sensitive to lipid phase transitions and reveals a relaxation process in dried lipids connected to the rearrangement of acyl chains.

    6. Raman, FTIR and XRD study of Icelandic tephra minerals: implications for Mars

      Emily J. Bathgate, Helen E. Maynard-Casely, Graziella Caprarelli, Linda Xiao, Barbara Stuart, Kate T. Smith and Ross Pogson

      Article first published online: 27 APR 2015 | DOI: 10.1002/jrs.4694

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      Samples of tephra from two Icelandic volcanoes were prepared and analysed by Raman spectroscopy, XRD and FTIR spectroscopy. The results are discussed in the context of relative success of the techniques in identifying primary and secondary minerals of volcanic products. This is relevant to the future exploration of planet Mars.

    7. Quantitative analysis of the phonon confinement effect in arbitrarily shaped Si nanocrystals decorated on Si nanowires and its correlation with the photoluminescence spectrum

      Ramesh Ghosh, Arindam Pal and P. K. Giri

      Article first published online: 19 APR 2015 | DOI: 10.1002/jrs.4704

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      Quantitative analysis of the phonon confinement effect for arbitrarily shaped Si nanocrystals is reported, and size distribution of the nanocrystals is obtained from the peak shift and asymmetric broadening of the Raman spectrum. The Raman analysis is found to be fully consistent with the size distribution obtained from the transmission electron microscopy analysis and the photoluminescence spectral analysis based on the quantum confinement effect.

    8. Raman spectroscopy of CaM2+Ge2O6 (M2+ = Mg, Mn, Fe, Co, Ni, Zn) clinopyroxenes

      E. Lambruschi, I. Aliatis, L. Mantovani, M. Tribaudino, D. Bersani, G. J. Redhammer and P. P. Lottici

      Article first published online: 19 APR 2015 | DOI: 10.1002/jrs.4681

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      The Raman spectra of CaM2+Ge2O6 (M2+ = Mg, Mn, Fe, Co, Ni, Zn) clinopyroxenes are discussed for the first time in comparison with CaCoSi2O6 and CaMgSi2O6. The vibrational frequencies of germanates may be roughly obtained by a scale factor of about ~0.8 by those of the corresponding silicates because of the Ge-Si mass difference. Thanks to this ratio, we have attributed the vibrational features. Furthermore, within Ge-pyroxenes, we analyzed the relationship between Raman shift and crystallographic parameters.

    9. Raman and infrared spectroscopic characterization of the arsenate-bearing mineral tangdanite– and in comparison with the discredited mineral clinotyrolite

      Ray L. Frost, Ricardo Scholz and Andrés López

      Article first published online: 15 APR 2015 | DOI: 10.1002/jrs.4691

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      The mixed anion mineral tangdanite Ca2Cu9(AsO4)4(SO4)0.5(OH)9∙9H2O has been studied using a combination of SEM, EDX, and Raman and infrared spectroscopy.

    10. Micro-Raman mapping of the polymorphs of serpentine

      J. R. Petriglieri, E. Salvioli-Mariani, L. Mantovani, M. Tribaudino, P. P. Lottici, C. Laporte-Magoni and D. Bersani

      Article first published online: 14 APR 2015 | DOI: 10.1002/jrs.4695

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      Serpentinites are rocks formed in large extent by minerals of the serpentine group: chrysotile, antigorite, lizardite, and polygonal serpentine. The identification of the main varieties of the serpentine group is of great interest for public health. Raman maps obtained in the OH region allow the discrimination of the four serpentine varieties. The identification of the different varieties of serpentine, at a micrometric scale, directly on the sample, within their textural environment, provides a new level of detail in the study of serpentinization process.

    11. Understanding the Raman spectral features of phyllosilicates

      Alian Wang, John J. Freeman and Bradley L. Jolliff

      Article first published online: 14 APR 2015 | DOI: 10.1002/jrs.4680

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      Phyllosilicates belong to one of the five major groups of silicates that have the most complex structures and chemistry. However, phyllosilicates were found at Mars surface by X-ray diffraction and Vis-Near IR spectroscopy though in situ surface exploration and orbital remote sensing. This study presents the first systematic Raman spectroscopic study on five major groups of phyllosilicates, which build a foundation for phyllosilicate characterization on Mars and other planetary bodies in our Solar System by in situ Raman spectroscopy.

    12. Study of both fingerprint and high wavenumber Raman spectroscopy of pathological nasopharyngeal tissues

      Wei Huang, Shanshan Wu, Maowen Chen, Liqing Sun, Yongzeng Li, Meizhen Huang, Shaohua Huang, Zhihong Xu, Rong Chen and Haishan Zeng

      Article first published online: 14 APR 2015 | DOI: 10.1002/jrs.4684

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      Both fingerprint (FP, 800–1800 cm−1) and high wavenumber (HW, 2700–3100 cm−1) Raman spectroscopy were utilized to evaluate the discrimination feasibility of nasopharyngeal non-cancerous and nasopharyngeal cancer (NPC) tissue. The results demonstrate that both FP and HW Raman spectroscopy have the potential for diagnosis and detection in early nasopharyngeal carcinoma, and HW Raman spectroscopy may improve the discrimination of NPC tissue compared with FP region alone, providing a promising diagnostic tool for discriminating nasopharyngeal non-cancerous from NPC tissue.

    13. Raman spectroscopy for identification and quantification analysis of essential oil varieties: a multivariate approach applied to lavender and lavandin essential oils

      Sofia Lafhal, Pierre Vanloot, Isabelle Bombarda, Robert Valls, Jacky Kister and Nathalie Dupuy

      Article first published online: 14 APR 2015 | DOI: 10.1002/jrs.4697

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      The Raman spectra of lavender and lavandin oils were very similar and were differentiated or used to build prediction models by chemometrics treatments. In this study, 104 samples were analyzed. A PLS regression model was used for quantitative analysis of the main compounds such as linalyl acetate, linalool and eucalyptol. The reference data were obtained by gas chromatography. The performance of the method was tested to discriminate the two species and the seven varieties and to predict the amount of the main compounds. The examination of regression factors allowed the identification of metabolomic markers.

    14. Time-resolved femtosecond CARS of the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate

      Johannes Kiefer, Mahesh Namboodiri, Mehdi M. Kazemi and Arnulf Materny

      Article first published online: 14 APR 2015 | DOI: 10.1002/jrs.4692

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      The ultrafast vibrational dynamics of the room-temperature ionic liquid [EMIm][EtSO4] are studied using time-resolved femtosecond coherent anti-Stokes Raman scattering. Observed beating pairs of Raman modes typically correspond to either the cation or the anion. No evidence for interionic vibrational energy transfer is found despite the fact that the interactions in the ion pair are characterized by strong hydrogen bonds. The image shows a spectrally resolved transient and the corresponding excitation profile together with the Raman spectrum.

    15. Nanocarbon hybrids of graphene-based materials and ultradispersed diamond: investigating structure and hierarchical defects evolution with electron-beam irradiation

      S. Gupta, E. Heintzman and J. Jasinski

      Article first published online: 14 APR 2015 | DOI: 10.1002/jrs.4682

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      The influence of electron-beam on the structural and physical properties of graphene (Gr), reduced graphene oxide (rGO) and graphene oxide (GO) with ultradispersed diamond (UDD) forming composite ensembles are reported with a focus on hierarchical defects evolution using in situ transmission electron microscopy conjoined with selected area electron diffraction. Raman spectroscopy and mapping were used to determine lattice point defects, inter-defect distance, and distribution. UDD stabilizes defects in the order: GO > rGO ≥ Gr besides geometric influence

    16. Revealing the biotic origin of silicified Precambrian carbonaceous microstructures using Raman spectroscopic mapping, a potential method for the detection of microfossils on Mars

      Frédéric Foucher, Mohamed-Ramzi Ammar and Frances Westall

      Article first published online: 14 APR 2015 | DOI: 10.1002/jrs.4687

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      Demonstrating the biogenicity of carbonaceous matter is not possible simply using its Raman spectrum, but we show here that Raman mapping documents non-random distribution of variations in the intensity ratio R of the two main peaks of carbonaceous matter within 800-Ma-old microfossils. We conclude that these variations can be used as a proof of biogenicity. This discovery is of great interest and could help to detect potential fossilized microbial remains on Mars.

    17. SERS microRaman spectral probing of adsorbate-containing, liquid-overlayed nanosponge Ag aggregates assembled from fractal aggregates

      Veronika Sutrová, Ivana Šloufová, Martina Nevoralová and Blanka Vlčková

      Article first published online: 14 APR 2015 | DOI: 10.1002/jrs.4690

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      Adsorbate-containing, nanosponge Ag aggregates overlayed by a thin liquid layer are reported as a new type of sample for SERS microRaman spectral measurements. The aggregates were prepared by 3D assembling of fused fractal aggregates formed in Ag nanoparticle hydrosol/HCl/adsorbate systems with 2,2′-bipyridine and/or tetrakis(2-methyl-4-pyridiniumyl)porphine as the testing adsorbates. The advantages of the new sample are localization of adsorbates into hot spots, prevention of their decomposition, simple preparation, and efficient concentration of hot spots into the focus of the laser beam.

    18. Thermal lens detection of one and two-color laser excitation of benzene in cryogenic liquid solutions

      Helena Diez-y-Riega, David Camejo and Carlos E. Manzanares

      Article first published online: 6 APR 2015 | DOI: 10.1002/jrs.4685

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      The thermal lens technique using one and two-color laser excitation is applied to vibrational overtone spectroscopy of cryogenic solutions of benzene. The absorption and relaxation process in the one-color laser (W1, 1) correspond to C–H excitation (υ = 0 to υ = 6) (red arrow) and non-radiative relaxation (yellow arrow) with rate constant k1. For the two-color laser scheme, the excitation laser promotes the C–H bond from the ground state (υ = 0) to (υ = 6) vibrational overtone (red line). A second laser (W2, 2) promotes the excited molecule to an electronic excited state (green arrow). Subsequent non-radiative relaxation to the ground state (blue arrow) with rate constant k2, results in enhancement of the thermal lens signal with respect to the one-color laser excitation.

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