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US 8,895,158 B2Granted
Nanoparticle taggants for explosive precursors
AssigneeThe Johns Hopkins University
InventorsMorgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
Life of this patent
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Abstract
An article includes a substrate with a plurality of independent taggant layers that each include metal oxide nanocrystals doped with at least one Lanthanide element. Each taggant layer includes metal oxide nanocrystals doped with a different Lanthanide element than each other taggant layer.
Claims14
An article comprising:
- a substrate comprising a plurality of independent taggant layers that each include doped metal oxide nanocrystals comprising zirconium oxide nanocrystals that are doped with at least one Lanthanide element, said doped metal oxide nanocrystals comprise annealed metal oxide nanocrystals and comprise increased intensities in fluorescence;
- wherein each taggant layer includes metal oxide nanocrystals that are doped with a different Lanthanide element than each other taggant layer.
An article comprising:
- a substrate comprising a plurality of independent taggant layers that each include doped metal oxide nanocrystals comprising zirconium oxide nanocrystals that are doped with at least one Lanthanide element;
- said doped metal oxide nanocrystals comprise annealed metal oxide nanocrystals and comprise increased intensities in fluorescence,
- wherein each taggant layer includes metal oxide nanocrystals that are doped at a different molar concentration than each other taggant layer.
Dependencies are inferred from the claim text.