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A multiscalar photoluminescence approach to discriminate among semiconducting historical zinc white pigments.

The Analyst (2013-04-05)
Loïc Bertrand, Matthieu Réfrégiers, Barbara Berrie, Jean-Philippe Échard, Mathieu Thoury
摘要

In order to fully characterize the zinc white artists' pigment (ZnO), much used since the mid-nineteenth century, three samples collected in the early 20th century were studied using a combination of synchrotron and macroscopic photoluminescence spectroscopy and imaging. An improved microscope setup based on synchrotron microspectroscopy and microimaging was used to study the powders dispersed onto indium foil. The synchrotron setup offered a diffraction-limited resolution of 153 nm. The PL spectra of individual grains were measured and the distribution of particles' emission spectra was mapped at the nanoscale. The results revealed that while the samples have apparent homogeneous photoluminescence behavior at the macroscale (bulk), their PL signatures are inhomogeneous below 20 μm. At the nanoscale the three powder samples have quite different PL signatures. Different sources, perhaps even different batches, of zinc white might be readily differentiated using this method.

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铟, foil, not light tested, 50x50mm, thickness 0.0025mm, temporary acrylic support, 99.8%
铟, foil, 100x100mm, thickness 0.25mm, as rolled, 99.999%
铟, foil, 50x50mm, thickness 0.5mm, as rolled, 99.999%
铟, foil, 6mm disks, thickness 0.1mm, as rolled, 100%
铟, foil, 6mm disks, thickness 0.20mm, as rolled, 100%
铟, foil, 6mm disks, thickness 0.25mm, as rolled, 100%
铟, foil, 6mm disks, thickness 0.5mm, as rolled, 100%
铟, foil, 6mm disks, thickness 0.75mm, as rolled, 100%
铟, foil, 6mm disks, thickness 1.0mm, as rolled, 100%
铟, foil, 8mm disks, thickness 0.0125mm, temporary acrylic support, 99.8%
铟, foil, 8mm disks, thickness 0.015mm, 99.8%
铟, foil, 8mm disks, thickness 0.01mm, 99.8%
铟, foil, 8mm disks, thickness 0.025mm, 99.8%
铟, foil, 8mm disks, thickness 0.02mm, 99.8%
铟, foil, 8mm disks, thickness 0.03mm, 99.8%
铟, foil, 8mm disks, thickness 0.04mm, 99.8%
铟, foil, 8mm disks, thickness 0.05mm, as rolled, 100%
铟, foil, 8mm disks, thickness 0.075mm, as rolled, 100%
铟, foil, 8mm disks, thickness 0.125mm, as rolled, 100%
铟, foil, 8mm disks, thickness 0.1mm, as rolled, 100%
铟, foil, 8mm disks, thickness 0.20mm, as rolled, 100%
铟, foil, 8mm disks, thickness 0.25mm, as rolled, 100%
铟, foil, 8mm disks, thickness 0.5mm, as rolled, 100%
铟, foil, 8mm disks, thickness 0.75mm, as rolled, 100%
铟, foil, 8mm disks, thickness 1.0mm, as rolled, 100%
铟, foil, light tested, 100x100mm, thickness 0.075mm, as rolled, 100%
铟, foil, light tested, 25x25mm, thickness 0.05mm, as rolled, 100%
铟, foil, light tested, 25x25mm, thickness 0.075mm, as rolled, 100%
铟, foil, light tested, 50x50mm, thickness 0.05mm, as rolled, 100%
铟, foil, not light tested, 100x100mm, thickness 0.006mm, temporary acrylic support, 99.8%