Synthesis of MAPbBr3‐Polymer Composite Films by Photolysis of DMF: Toward Transparent and Flexible Optical Physical Unclonable Functions (PUFs) with Hierarchical Multilevel Complexity

Physical entities with inherent randomness have been investigated as anti‐counterfeiting labels based on physical unclonable functions (PUFs). Herein, a transparent and flexible optical PUF label associated with multilevel complexity is demonstrated by taking advantage of the optical properties of h...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2023-02, Vol.35 (6), p.e2208151-n/a
Main Authors: Minh, Duong Nguyen, Nguyen, Lan Anh Thi, Nguyen, Quynh H., Vu, Thanh Van, Choi, Jinwoo, Eom, Sangwon, Kwon, S. Joon, Kang, Youngjong
Format: Article
Language:English
Subjects:
Chemical synthesis
Combinatorial analysis
Complexity
composite film
hierarchical patterning
Labels
Materials science
Metal halides
Multilevel
multilevel complexity
Nanoparticles
Optical properties
perovskite
Perovskites
Phase separation
Photolysis
Polymer films
Polymer matrix composites
Polymers
Polymethyl methacrylate
Polystyrene resins
PUF
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Summary:Physical entities with inherent randomness have been investigated as anti‐counterfeiting labels based on physical unclonable functions (PUFs). Herein, a transparent and flexible optical PUF label associated with multilevel complexity is demonstrated by taking advantage of the optical properties of hierarchical morphologies of the composite film composed of metal halide perovskite nanoparticles (MAPbBr3 NPs) and the intrinsic spinodal‐decomposition‐like phase separation of polymer blend (PMMA/PS blend). Due to the combinatorial effects of the photolysis synthesis of MAPbBr3 and the thermodynamic instability of the PMMA/PS blend, randomized patterns emerge at two‐level scales. These patterns are intrinsically non‐deterministic, and therefore, the PUF labels from the multilevel random patterns are challenging to replicate. This is mainly attributed to random spot patterns (higher‐level patterns) confined within intricate bicontinuous patterns (lower‐level patterns). Fluorescent optical PUFs with hierarchical patterns are prepared by the top‐down photolithography in combination with the bottom‐up phase separation process on MAPbBr3‐PMMA/PS composite films. The hierarchical patterns consist of random‐sized spot patterns (higher‐level patterns) confined within randomly oriented bicontinuous patterns (lower‐level patterns). To achieve such multilevel complex patterns, a synthetic method of MAPbBr3 NPs based on the photolysis of DMF is newly developed.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202208151