4.8 Article

Paper Information Recording and Security Protection Using Invisible Ink and Artificial Intelligence

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 16, Pages 19443-19449

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c01179

Keywords

carbon nanoparticles; invisible ink; paper security; encryption; high complexity; artificial intelligence

Funding

  1. Shenzhen Peacock Team Plan [KQTD20170809110344233]
  2. Bureau of Industry and Information Technology of Shenzhen through the Graphene Manufacturing Innovation Center [201901161514]

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This study introduces a paper information protection scheme that combines fluorescent invisible ink and artificial intelligence. The ink, prepared using carbon nanoparticles with high quantum yield and stability, can only be read correctly with a specially trained neural network and UV irradiation. This strategy offers new opportunities for advanced paper information encryption and explores the applications of carbon nanoparticles and artificial intelligence.
Conventional paper information protection mainly relies on stimuli-responsive functional materials that can display color or luminescence under external stimuli; however, this method is rather predictable and can be easily cracked. In this work, a paper information protection scheme combining fluorescent invisible ink and artificial intelligence was proposed. The ink was prepared by dissolving carbon nanoparticles in water, which has a high quantum yield and outstanding light stability and salt stability, thus ensuring the integrity of information in complex environments. A five-layer convolutional neural network (one of the two mainstream architectures in today's artificial intelligence fields) was specially trained based on ultraviolet light excited symbols printed by invisible ink. Using this scheme, the correct information could only be read with the specially trained neural network after ultraviolet (UV) irradiation. Without this trained neural network or UV irradiation, misleading messages will be presented. Moreover, it was possible to design unpredictable and highly complex password books to further increase information security. This smart strategy provides new opportunities for high-level paper information encryption and also proposes new ideas for the applications of carbon nanoparticles and artificial intelligence.

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