Combined photoluminescence and Raman microscopy for the identification of modern pigments: explanatory examples on cross-sections from Russian avant-garde paintings
| Autor: | Saveria Mosca, ALESSIA ARTESANI, Gianluca Valentini, Marta Ghirardello, Sara Mosca, Austin Nevin, Daniela Comelli |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Archeology
Photoluminescence Materials science lcsh:Fine Arts Painting materials Photoluminescence microscopy Pigment identification Raman microscopy Time-resolved photoluminescence lcsh:Analytical chemistry Context (language use) Conservation 01 natural sciences chemistry.chemical_compound symbols.namesake 0103 physical sciences Microscopy Spectroscopy Chrome yellow lcsh:QD71-142 010304 chemical physics business.industry 010401 analytical chemistry 0104 chemical sciences Semiconductor chemistry symbols Optoelectronics lcsh:N business Luminescence Raman spectroscopy |
| Zdroj: | Heritage Science, Vol 7, Iss 1, Pp 1-13 (2019) |
| Popis: | In conservation science, the identification of painting materials is fundamental for the study of artists’ palettes, for dating and for understanding on-going degradation phenomena. For these purposes, the study of stratigraphic micro-samples provides unique information on the complex heterogeneity of the pictorial artworks. In this context, we propose a combined-microscopy approach based on the application of time-resolved photoluminescence (TRPL) micro-imaging and micro-Raman spectroscopy. The TRPL device is based on pulsed laser excitation (excitation wavelength = 355 nm, 1 ns pulse width) and time-gated detection, and it is suitable for the detection of photoluminescent emissions with lifetime from few nanoseconds to hundreds of microseconds. In this work, the technique is beneficially applied for identifying different luminescent semiconductor and mineral pigments, on the basis of their spectral and decay kinetic emission properties. The spatial heterogeneities, detected in the micro-sample, are investigated with Raman spectroscopy (785-nm in CW mode) for a further identification of the paint composition on basis of the molecular vibrations associated with the crystal structure. The effectiveness and limits of the proposed combined method is discussed through analysis of a corpus of stratigraphic micro-samples from Russian Avant-garde modern paintings. In the selected samples, the method allows the identification of modern inorganic pigments such as cadmium-based pigments, zinc white, titanium white, chrome yellow, ultramarine and cinnabar. |
| Databáze: | OpenAIRE |
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