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  • High piezo-resistive perfor...
    Zhai, Tianliang; Verdolotti, Letizia; Kacilius, Saulius; Cerruti, Pierfrancesco; Gentile, Gennaro; Xia, Hesheng; Stanzione, Mariamelia; Buonocore, Giovanna Giuliana; Lavorgna, Marino

    Nanoscale, 2019-May-09, Letnik: 11, Številka: 18
    Journal Article

    Anisotropic aerogel-foam composites were developed by embedding a reduced graphene oxide (rGO)/chitosan aerogel directly into an open-cell polyurethane foam through an in situ bidirectional freeze-drying process. The resulting aerogel-foam composites possess both excellent compression-resilience performance and stable piezo-resistive properties due, respectively, to the excellent mechanical properties of polyurethane foams and to the presence of a chitosan-based aerogel loaded with rGO. The latter, indeed, provides outstanding electrical properties due to its conductive and parallel flat lamellar structure. It has been proven that both mechanical and piezo-resistive properties are stable even after 1000 loading/unloading cycles and a reduction of the electrical resistance of about 86% is observed upon the application of a 60% strain. The high sensitivity, long cycling life, and reliable performance over a wide strain range make this unique anisotropic aerogel-foam composite a highly promising candidate for the production of wearable sensors and healthcare monitoring devices.