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Analytical and Bioanalytical Chemistry

, Volume 402, Issue 4, pp 1443–1450 | Cite as

Multivariate classification of pigments and inks using combined Raman spectroscopy and LIBS

  • Marek Hoehse
  • Andrea Paul
  • Igor Gornushkin
  • Ulrich Panne
Original Paper

Abstract

The authenticity of objects and artifacts is often the focus of forensic analytic chemistry. In document fraud cases, the most important objective is to determine the origin of a particular ink. Here, we introduce a new approach which utilizes the combination of two analytical methods, namely Raman spectroscopy and laser-induced breakdown spectroscopy (LIBS). The methods provide complementary information on both molecular and elemental composition of samples. The potential of this hyphenation of spectroscopic methods is demonstrated for ten blue and black ink samples on white paper. LIBS and Raman spectra from different inks were fused into a single data matrix, and the number of different groups of inks was determined through multivariate analysis, i.e., principal component analysis, soft independent modelling of class analogy, partial least-squares discriminant analysis, and support vector machine. In all cases, the results obtained with the combined LIBS and Raman spectra were found to be superior to those obtained with the individual Raman or LIBS data sets.

Figure

Combination of Raman spectroscopy and LIBS for improved classification of inks: score plot from PCA and experimental set-up

Keywords

Pigments Raman LIBS Chemometrics 

Notes

Acknowledgments

We gratefully acknowledge funding of this research by the Bundesministerium für Wirtschaft und Technologie BMWi MNPQ grant 21/06 and the financial support from Deutsche Forschungsgemeinschaft DFG-NSF grant GO 1848/1-1 and NI 185/38-1 (USA; Germany). The authors sincerely thank Dr. Ursula Hendriks and Dr. Gerlinda Thulke from Landeskriminalamt LKA Berlin for providing the test samples and helpful discussions. Finally, A.P. would like to acknowledge and thank Prof. W. Kessler and Dr. F. Westad for all the fruitful conversations.

Supplementary material

216_2011_5287_MOESM1_ESM.pdf (545 kb)
ESM 1 (PDF 545 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Marek Hoehse
    • 1
  • Andrea Paul
    • 1
  • Igor Gornushkin
    • 1
  • Ulrich Panne
    • 1
    • 2
  1. 1.BAM Federal Institute for Materials Research and TestingBerlinGermany
  2. 2.Institut für Chemie, Humboldt-Universität zu BerlinBerlinGermany

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