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    Ink-jet printing of particle-free silver inks on fabrics with a superhydrophobic protection layer for fabrication of robust electrochemical sensors
    (Elsevier, 2021) Ipekci, Hasan Huseyin; Gozutok, Zehra; Celik, Nusret; Onses, M. Serdar; Uzunoglu, Aytekin
    The present work demonstrates the fabrication of novel flexible sensors by the deposition of conductive silver patterns on polyester-based fabrics. The conductive layer on the textile surface was formed by ink-jet printing of particle-free silver inks and a subsequent heat treatment. A novel approach is presented to define the working area and ensure high electrode stability by deposition of a superhydrophobic coating on the conductive patterns. The physical and chemical characterizations of the fabricated electrodes were conducted using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), and contact angle measurements. The conductivity of the printed electrodes was highly stable against repeated bending cycles. Hydrogen peroxide was used as the model analyte to evaluate the electrochemical sensing performance of the textile-based flexible sensors. The chronoamperometry results indicated a high sensitivity of 295.3 ? 0.04 ?A mM-1 cm-2 (n = 5) with the linear range of 50 ?M-70 mM. The results suggested that our novel textile-based electrode design is an excellent candidate for the construction of flexible electrochemical sensors with high conductivity and catalytic activity, high bending resilience, wide sensing window, and excellent storage stability.
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    SERS-active linear barcodes by microfluidic-assisted patterning
    (Academic Press Inc Elsevier Science, 2021) Pekdemir, Sami; Ipekci, Hasan Hueseyin; Serhatlioglu, Murat; Elbuken, Caglar; Onses, M. Serdar
    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 mu m, with a total barcode length on the order of 100 mu m. 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. (C) 2020 Elsevier Inc. All rights reserved.