Volume 95 Issue 44 | p. 10 | Concentrates
Issue Date: November 6, 2017

Making invisible inks more invisible

Simple process converts MOF in invisible ink to luminescent nanocrystals, providing reversible invisibility
Department: Science & Technology
News Channels: Materials SCENE, Organic SCENE
Keywords: Nanomaterials, invisible ink, encryption, MOF, nanocrystal

Invisible inks based on “smart” fluorescent materials have been shining brightly (if only you could see them) in the data-encryption/decryption arena lately. Researchers have debuted various organic dyes, nanocrystals, and other materials to help keep confidential information secure and to develop anticounterfeiting strategies. But some of the materials are costly or difficult to prepare, and many of these inks remain somewhat visible when illuminated with ambient or ultraviolet light. Liang Li and coworkers at Shanghai . . .

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