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Terahertz Analysis of Phthalocyanine Pigments

  • A. D. SquiresEmail author
  • R. A. Lewis
Article
  • 61 Downloads

Abstract

In situ, non-invasive and non-destructive analysis of important artworks and cultural pieces is largely important in art conservation science. Terahertz time-domain spectroscopy and imaging delivers these requirements but lacks a materials database with fundamental understanding of salient pigments, binders and substrates. In this study, the most important synthetic pigments, the copper phthalocyanines, are investigated through terahertz time-domain spectroscopy. The terahertz spectrum reveals a series of characteristic modes in a 0.1–3-THz range across 14 pigment samples. Identification and distinction of copper phthalocyanines’ α, β and 𝜖 crystal polymorphs is demonstrated. This uniqueness within the terahertz regime is extended to two halogenated variants and a metal-free form. This invites the use of THz spectroscopy in investigation of contemporary artworks, post 1935, containing these pigments and promotes applications such as identifying fraudulent works of art.

Keywords

Terahertz THz Spectroscopy Phthalocyanine Pigment Paint Painting Art Artwork 

Notes

Acknowledgements

We would like to acknowledge Saroj Bhattacharyya and the University of New South Wales for assistance in acquiring PXRD of the pigment samples.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute for Superconducting and Electronic Materials and School of PhysicsUniversity of WollongongWollongongAustralia

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