[Le rôle des clusters d'argent en photographie]
Le principe de la photographie argentique est basée sur la photosensibilité de petits cristaux d'halogénure d'argent. La lumière génère des clusters de quelques atomes d'argent sur les cristaux. L'ensemble constitue l'image latente invisible d'intensité extrêmement faible. Le développement consiste à convertir chimiquement en particules d'argent métallique les cristaux contenant un cluster de nucléarité supercritique d'atomes d'argent photoinduits et à transformer catalytiquement l'image latente en une image visible. Le dopage des cristaux par un capteur sélectif anti-oxydant permet d'empêcher la perte des électrons, qui sinon se recombineraient rapidement avec les trous, et d'atteindre le rendement quantique intégral en atomes formés par photon absorbé.
The principle of silver photography is based on the photosensitivity of minute silver halide crystals. The light generates clusters of a few silver atoms on the crystals. Their ensemble constitutes the latent image of extremely weak intensity and invisible. The development consists of converting chemically into metal particles the crystals containing a cluster with a supercritical number of photoinduced silver atoms and of transforming catalytically the latent image into a visible picture. Crystal doping by a selective anti-oxidant scavenger permits one to avoid the loss of electrons, which otherwise recombine rapidly with holes, and to reach the integral quantum yield of atoms produced per photon absorbed.
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Jacqueline Belloni 1
@article{CRPHYS_2002__3_3_381_0,
author = {Jacqueline Belloni},
title = {The role of silver clusters in photography},
journal = {Comptes Rendus. Physique},
pages = {381--390},
publisher = {Elsevier},
volume = {3},
number = {3},
year = {2002},
doi = {10.1016/S1631-0705(02)01321-X},
language = {en},
}
Jacqueline Belloni. The role of silver clusters in photography. Comptes Rendus. Physique, Volume 3 (2002) no. 3, pp. 381-390. doi : 10.1016/S1631-0705(02)01321-X. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/S1631-0705(02)01321-X/
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