3D assembly of upconverting NaYF4 nanocrystals by AFM nanoxerography: creation of anti-counterfeiting microtags - INSA Toulouse - Institut National des Sciences Appliquées de Toulouse Access content directly
Journal Articles Nanoscale Year : 2013

3D assembly of upconverting NaYF4 nanocrystals by AFM nanoxerography: creation of anti-counterfeiting microtags

Abstract

Formation of 3D close-packed assemblies of upconverting NaYF4 colloidal nanocrystals (NCs) on surfaces, by Atomic Force Microscopy (AFM) nanoxerography is presented. The surface potential of the charge patterns, the NC concentration, the polarizability of the NCs and the polarity of the dispersing solvent are identified as the key parameters controlling the assembly of NaYF4 NCs into micropatterns of the desired 3D architecture. This insight allowed us to fabricate micrometer sized Quick Response (QR) codes encoded in terms of upconversion luminescence intensity or color. Topographically hidden messages could also be readily incorporated within these microtags. This work demonstrates that AFM nanoxerography has enormous potential for generating high-security anti-counterfeiting microtags.
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Dates and versions

hal-02050613 , version 1 (27-02-2019)

Identifiers

  • HAL Id : hal-02050613 , version 1

Cite

Neralagatta Sangeetha, Pierre Moutet, Delphine Lagarde, Gregory Sallen, Bernhard Urbaszek, et al.. 3D assembly of upconverting NaYF4 nanocrystals by AFM nanoxerography: creation of anti-counterfeiting microtags. Nanoscale, 2013, 5 (20), pp.9587. ⟨hal-02050613⟩
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