Screen-printed nanoparticles as anti-counterfeiting tags

Abstract

Metallic nanoparticles with different physical properties have been screen printed as authentication tags on different types of paper. Gold and silver nanoparticles show unique optical signatures, including sharp emission bandwidths and long lifetimes of the printed label, even under accelerated weathering conditions. Magnetic nanoparticles show distinct physical signals that depend on the size of the nanoparticle itself. They were also screen printed on different substrates and their magnetic signals read out using a magnetic pattern recognition sensor and a vibrating sample magnetometer. The novelty of our work lies in the demonstration that the combination of nanomaterials with optical and magnetic properties on the same printed support is possible, and the resulting combined signals can be used to obtain a user-configurable label, providing a high degree of security in anti-counterfeiting applications using simple commercially-available sensors.

Aspekty nanomateriałów w zastosowaniach cywilnych i militarnych. Część 2. Wykorzystanie i obawy wynikające z ich uwalniania do środowiska przyrodniczego

“…rare earth) [132]; -niewidoczne kody kreskowe na bazie nanocząstek złota (Au) i srebra (Ag) [133]; -zbiorniki na paliwo spełniające wymogi bezpieczeństwa przygotowane na bazie nanocząstek gliny [132,134]; -nanokompozyty polimerowe -modyfikowane bentonity, jako napełniacze tworzyw sztucznych stosowanych do konstrukcji nowoczesnych opakowań [132,135]; -nanocząstki metali, jako absorbenty ditlenu (O2) w opakowaniach [136][137][138][139][140][141][142][143][144][145][146][147].…”

Novel bifunctional lanthanide‐centered nanophosphors for latent fingerprint detection and anti‐counterfeiting applications

“…Visible photoluminescent security ink is a technology based on ink glowing under UV illumination. There are many reports in this field, involving highly toxic, broadly luminescent and expensive nanomaterials such as CdS, CdSe and gold which are soluble in hazardous media . Moreover, these types of luminescent security inks are unstable .…”

“…There are many reports in this field, involving highly toxic, broadly luminescent and expensive nanomaterials such as CdS, CdSe and gold which are soluble in hazardous media. [7,8] Moreover, these types of luminescent security inks are unstable. [9] The unique optical and photoluminescent properties and low toxicity of materials based on lanthanides as activators open a new area in the anti-counterfeiting field.…”

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

“…The development of variety of materials capable of producing unbreakable security codes and markers are currently a hot topic of research . The selection of materials for development of security codes follows a stringent criterion that these should be stable for long time, easy to be synthesised with high yields at economical cost, eco‐friendly, difficult to counterfeit etc …”

“…[6] The selectiono fm aterials for developmento fs ecurity codes follows as tringentc riterion that these should be stable for long time, easy to be synthesised with high yields at economical cost, eco-friendly,d ifficult to counterfeite tc. [6][7][8][9][10] In the last decade, various kinds of luminescentm aterials like conventionalo rganic dyes, lanthanide based luminescent nanomaterials, [6][7][8][11][12][13][14][15] semiconductor quantum dots, [16][17][18][19][20][21] carbonb ased quantum dots, [22][23][24][25] plasmonic nanomaterials, [26][27][28][29][30] metal-organic-frameworks (MOFs) [31][32][33][34] etc. have been explored for security ink fabrication to serve the purposeo f anti-counterfeiting applications.A ll the abovem entioned types have some pros and cons associated with them.…”