SERS-active linear barcodes by microfluidic-assisted patterning

[Display omitted] Simple, low-cost, robust, and scalable fabrication of microscopic linear barcodes with high levels of complexity and multiple authentication layers is critical for emerging applications in information security and anti-counterfeiting. This manuscript presents a novel approach for f...

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Bibliographic Details
Published in:Journal of colloid and interface science 2021-02, Vol.584, p.11-18
Main Authors: Pekdemir, Sami, Ipekci, Hasan Hüseyin, Serhatlioglu, Murat, Elbuken, Caglar, Onses, M. Serdar
Format: Article
Language:English
Subjects:
Anti-counterfeiting
Colloidal nanoparticles
Microfluidics
Plasmonics
SERS
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Summary:[Display omitted] Simple, low-cost, robust, and scalable fabrication of microscopic linear barcodes with high levels of complexity and multiple authentication layers is critical for emerging applications in information security and anti-counterfeiting. This manuscript presents a novel approach for fabrication of microscopic linear barcodes that can be visualized under Raman microscopy. Microfluidic channels are used as molds to generate linear patterns of end-grafted polymers on a substrate. These patterns serve as templates for area-selective binding of colloidal gold nanoparticles resulting in plasmonic arrays. The deposition of multiple taggant molecules on the plasmonic arrays via a second microfluidic mold results in a linear barcode with unique Raman fingerprints that are enhanced by the underlying plasmonic nanoparticles. The width of the bars is as small as 10 μm, with a total barcode length on the order of 100 μm. The simultaneous use of geometric and chemical security layers provides a high level of complexity challenging the counterfeiting of the barcodes. The additive, scalable, and inexpensive nature of the presented approach can be easily adapted to different colloidal nanomaterials and applications.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2020.09.087