Fluorescence Lifetime Phasor Analysis and Raman Spectroscopy of Pigmented Organic Binders and Coatings Used in Artworks

Year: 2022

Authors: Dal Fovo A., Mattana S., Chaban A., Balbas DQ., Lagarto JL., Striova J., Cicchi R., Fontana R.

Autors Affiliation: CNR, Natl Inst Opt CNR INO, Largo E Fermi 6, I-50125 Florence, Italy; European Lab Nonlinear Spect LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.

Abstract: Fluorescence analysis of materials used as binders and coatings in artworks is often hampered by numerous factors, leading to uncertainties in data interpretation. Fluorescence lifetime (FL) measurements enable improvement of the specificity with respect to steady-state measurements by resolving the decay dynamics of the fluorophore emissions. In this work, layers of natural resin, oil, and wax-in pure form, pigmented, in mixtures, and spread on different substrates-were analyzed using a compact, portable, fiber-based FL instrument. FL data were processed via the phasor method and integrated with Raman spectroscopy to obtain complementary chemical information on the different substances. It was observed that the tau-phase of the mixtures is affected by both the pigments and the dispersing medium, and that the presence of the metal substrate contributes to changes in the FL of mixtures. The results obtained with our portable FL system combined with Raman spectroscopy pave the way for a systematic study of a larger number of materials for future in situ applications on works of art.

Journal/Review: APPLIED SCIENCES-BASEL

Volume: 12 (1)      Pages from: 179-1  to: 179-12

More Information: This research was funded by Regione Toscana (POR FSE 2014–2020, “Giovanisì”, Intervention Program “CNR4C”, CUP B15J19001040004).
KeyWords: fluorescence lifetime; Raman spectroscopy; phasor analysis; organic binders; fluorescent pigments
DOI: 10.3390/app12010179

Citations: 8
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