[Paper] Invisible Information using Antimony Doped Tin Oxide Ink: Synthesis of Antimony Doped Tin Oxide Ink and Addition of Invisible Information in Color Design

Abstract

Invisible materials have attracted attention for anti-counterfeiting and traceability. We have focused on antimony-doped tin oxide (ATO), which can be used for the anti-counterfeiting and traceability applications. By controlling the amount of antimony doping, we have succeeded to prepare antimony tin oxide (ATO) inks with high transparency under visible light and high absorption under near-infrared light. In addition, by interpolating the color difference between the image to be given invisible information and the ATO ink, we have succeeded in imparting information on paper that is difficult to see in the visible region but readable in the near-infrared region.