Use of CdS quantum dot-functionalized cellulose nanocrystal films for anti-counterfeiting applications

Structural colors and photoluminescence have been widely used for anti-counterfeiting and security applications. We report for the first time the use of CdS quantum dot (QD)-functionalized cellulose nanocrystals (CNCs) as building blocks to fabricate nanothin films via layer-by-layer (LBL) self-asse...

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Bibliographic Details
Published in:Nanoscale 2016-07, Vol.8 (27), p.13288-13296
Main Authors: Chen, L, Lai, C, Marchewka, R, Berry, R. M, Tam, K. C
Format: Article
Language:English
Subjects:
Cellulose
Computer numerical control
Nanocrystals
Nanostructure
Polyethylene terephthalates
Quantum dots
Self assembly
Substrates
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Summary:Structural colors and photoluminescence have been widely used for anti-counterfeiting and security applications. We report for the first time the use of CdS quantum dot (QD)-functionalized cellulose nanocrystals (CNCs) as building blocks to fabricate nanothin films via layer-by-layer (LBL) self-assembly for anti-counterfeiting applications. Both negatively- and positively-charged CNC/QD nanohybrids with a high colloidal stability and a narrow particle size distribution were prepared. The controllable LBL coating process was characterized by scanning electron microscopy and ellipsometry. The rigid structure of CNCs leads to nanoporous structured films on poly(ethylene terephthalate) (PET) substrates with high transmittance (above 70%) over the entire range of visible light and also resulted in increased hydrophilicity (contact angles of ∼40 degrees). Nanothin films on PET substrates showed good flexibility and enhanced stability in both water and ethanol. The modified PET films with structural colors from thin-film interference and photoluminescence from QDs can be used in anti-counterfeiting applications. CdS quantum dot-functionalized cellulose nanocrystal thin films with structural colors from thin-film interference for colorimetric identification and photoluminescence for additional authentication in anticounterfeiting applications.
ISSN:2040-3364
2040-3372
DOI:10.1039/c6nr03039d