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Laser scribing of graphene oxide using Bessel beam for humidity sensing - EurekAlert
<p>Graphene and its derivatives show considerable promise in humidity sensing applications. Laser direct writing enables the fabrication, modification, and patterning of these derivatives, offering a crucial avenue for developing graphene-based humidity sensors. In this study, researchers addressed the challenge of laser defocusing in large-scale processing by employing a diffraction-free Bessel beam. This approach allowed for the one-step fabrication of reduced graphene oxide (rGO) electrodes tailored for humidity sensing, enhancing stability under defocusing conditions. The study demonstrated that utilizing Bessel laser direct scribing maintains stable line width, resistance, and sheet resistance of rGO electrodes within a defocusing range of ±1.00 mm. Moreover, defocusing proved effective in reducing the ablation region during fabrication. The study also evaluated the temperature and humidity responses of electrodes fabricated with typical defocusing settings, shedding light on relevant mechanisms and affirming the feasibility of these electrodes for humidity sensing applications. Furthermore, the investigation into Bessel-beam-based laser fabrication techniques serves as a valuable reference for the rapid, flexible, and stable production of graphene-based humidity sensors.</p>
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