Synthesis of hybrid colloidal nanoparticles for a generic approach to 3D electrostatic directed assembly: Application to anti-counterfeiting

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:582

Article

Platel, Romain¹  Vaure, Louis¹  Palleau, Etienne¹  Raffy, Simon¹  Guerin, Francois¹  Lagarde, Delphine¹  Cours, Robin²  Marcelot, Cecile²  Warot-Fonrose, Benedicte²  Nayral, Celine¹  Delpech, Fabien¹  Ressier, Laurence¹ 

[1] Univ Toulouse, LPCNO, CNRS, INSA,UPS, 135 Ave Rangueil, F-31077 Toulouse, France

[2] Univ Toulouse, CNRS, CEMES, 29 Rue Jeanne Marvig, F-31055 Toulouse, France

关键词: Colloidal hybrid nanoparticle;    Nanoxerography;    Quantum dots;    3D directed assembly;    Electrostatic trapping;    Anti-counterfeiting;    QR code;   

DOI  :  10.1016/j.jcis.2020.08.098

来源: Elsevier

【 摘 要 】

Hypothesis: The capability of making 3D directed assembly of colloidal nanoparticles on surfaces, instead of 2D one, is of major interest to generate, tailor, and enhance their original functionalities. The nanoxe-rography technique, i.e. electrostatic trapping of nanoparticles on charged patterns, showed such 3D assembly potentialities but is presently restricted to polarizable nanoparticles with a diameter superior to 20 nm. Hence, it should be possible to exploit a generic approach based on hybrid systems using larger nanoparticles as cargos to anchor smaller ones. Experiments: A synthesis of hybrid nanoparticles in a raspberry-like configuration was performed using 50 nm SiO2 nanoparticles and photoluminescent 3-5 nm InP@ZnS (visible emission) or PbS (infrared emission) nanoparticles. Complete topographical and photoluminescent characterizations were carried out on hybrid nanoparticle patterns assembled by nanoxerography and systematically compared to patterns obtained from single photoluminescent nanoparticles. Findings: The synthesis approach is generic. Every hybrid nanoparticle system has led to 3D assemblies with improved photoluminescent signals compared to mono/bilayered assemblies. Straightforward applications for anti-counterfeiting are illustrated. The versatility of the proposed concept is expected to be applied to other nanoparticles to make the most of their magnetic, catalytic, optical etc. properties in a wide range of applications, sensors and devices. (C) 2020 Elsevier Inc. All rights reserved.

【 授权许可】

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