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    Item type:Publication, Access status: without files ,
    Sustainable design of high-performance multifunctional carbon electrodes by one-step laser carbonization for supercapacitors and dopamine sensors
    (2024-04-09)
    Moon, Sanghwa
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    Senokos, Evgeny
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    Trouillet, Vanessa
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    Loeffler, Felix F.
    ;
    Strauss, Volker
    Laser carbonization is a rapid method to produce functional carbon materials for electronic devices, but many typical carbon precursors are not sustainable and/or require extensive processing for electrochemical applications. Here, a sustainable concept to fabricate laser patterned carbon (LP-C) electrodes from biomass-derived sodium lignosulfonate, an abundant waste product from the paper industry is presented. By introducing an adhesive polymer interlayer between the sodium lignosulfonate and a graphite foil current collector, stable, abrasion-resistant LP-C electrodes can be fabricated in a single laser irradiation step. The electrode properties can be systematically tuned by controlling the laser processing parameters. The optimized LP-C electrodes demonstrate a promising performance in supercapacitors and electrochemical dopamine biosensors. They exhibit high areal capacitances of 38.9 mF cm−2 in 1 M H2SO4 and high energy and power densities of 4.3 μW h cm−2 and 16 mW cm−2 in 17 M NaClO4, showing the best performance among biomass-derived LP-C materials reported so far. After 20 000 charge/discharge cycles, they retain a high capacitance of 81%. Dopamine was linearly detected in the range of 0.1 to 20 μM with an extrapolated limit of detection of 0.5 μM (S/N = 3) and high sensitivity (13.38 μA μM−1 cm−2), demonstrating better performance than previously reported biomass-derived LP-C dopamine sensors.
    Publicationtype: Journal Article
      6
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    Item type:Publication, Access status: without files ,
    Replication of Polymer-Based Peptide Microarrays by Multi-Step Transfer
    (Wiley, 2016-09-01)
    Striffler, Jakob
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    Mattes, Daniela S.
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    Schillo, Sebastian
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    Münster, Bastian
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    Palermo, Andrea
    Peptide microarrays serve as a high-throughput tool for the readout of protein–peptide interactions. We present a multi-step purification of high-complexity peptide microarrays by transfer to specialized surfaces. Only correctly synthesized peptides are transferred from the synthesis surface to various substrates where they can be immobilized by a variety of different anchor molecules. Here, we demonstrate the transfer to rigid streptavidin, epoxide, gold, and azide surfaces. The reported method reduces the cost of purified peptide array production through the reproduction of one array several times.
    Publicationtype: Journal Article
      5