Unclonable Plasmonic Security Labels Achieved by Shadow-Mask-Lithography-Assisted Self-Assembly

Yuanhui Zheng, Cheng Jiang, Soon Hock Ng, Yong Lu, Fei Han, Udo Bach, J. Justin Gooding

Research output: Contribution to journalArticleResearchpeer-review

33 Citations (Scopus)


Researchers demonstrate a low-cost, nondestructive, unclonable anti-counterfeiting strategy that takes advantage of multifunctional fluorescein-embedded silver@silica core-shell NPs as information carriers for graphical and spectral coding. A shadow-mask-lithography-assisted self-assembly method is developed for the fabrication of the plasmonic security labels, in which the multifunctional core-shell nanoparticles (NPs) are electrostatically adsorbed onto an amino-terminated micropattern generated by shadow mask lithography. The random arrangement of discrete NPs on the micropatterns, originating from Brownian motion during the self-assembly, makes the security labels unclonable.

Original languageEnglish
Pages (from-to)2330-2336
Number of pages7
JournalAdvanced Materials
Issue number12
Publication statusPublished - 23 Mar 2016


  • core-shell nanoparticles
  • dark-field and fluorescence microscopy
  • security labels
  • self-assembly
  • surface-enhanced Raman scattering

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