Photothermally Responsive Inks for Inkjet-Printing Secure Information

Giuseppe Chirico, Giacomo Dacarro, Colm O'Regan, Jouko Peltonen, Jawad Sarfraz, Angelo Taglietti, Mykola Borzenkov, Piersandro Pallavicini

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


2D patterns of photothermally responsive near-infrared (NIR) absorbing gold nanostars (GNS), coated with multiple charged polymer layers, are inkjet-printed on a glass surface. The shape of the localized surface plasmon resonance (LSPR) NIR absorption bands in the printed patterns loses its peaked form due to plasmon coupling, unless GNS are enveloped in multiple coating layers, keeping the inter-GNS distance sufficiently large. In the latter case, the photothermal temperature increase (ΔT) induced by the NIR laser irradiation follows a ΔT versus irradiation wavelength (λirr) profile with the same sharply peaked shape of the LSPR bands of the liquid ink. With this result, a new paradigm for inkjet-writing secure information is introduced, as an alternative to the current methods based on direct visual inspection of printed patterns. While the printed ink patterns of GNS with different coatings are visually indistinguishable despite their different NIR absorption spectrum, their photothermal response changes dramatically with λirr. This allows either to write and read simple information using a single λirr (YES answer for ΔT > threshold) or to use multiple λirr to write and read complex information like thermal bar codes and anti-counterfeit signatures.
Original languageEnglish (US)
Pages (from-to)1800095
JournalParticle & Particle Systems Characterization
Issue number9
StatePublished - Aug 8 2018


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