SERS-active linear barcodes by microfluidic-assisted patterning

PEKDEMİR S. , Ipekci H. H. , Serhatlioglu M., Elbuken C., ÖNSES M. S.

Journal of Colloid and Interface Science, vol.584, pp.11-18, 2021 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 584
  • Publication Date: 2021
  • Doi Number: 10.1016/j.jcis.2020.09.087
  • Title of Journal : Journal of Colloid and Interface Science
  • Page Numbers: pp.11-18
  • Keywords: Anti-counterfeiting, SERS, Plasmonics, Microfluidics, Colloidal nanoparticles, RAMAN-SCATTERING, POLYMER BRUSHES, NANOSTRUCTURES, NANOPARTICLES, FABRICATION, MONOLAYERS, FLOW


© 2020 Elsevier Inc.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.