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Robust sandwich micro-structure coating

Time:2020-02-27 15:40:57  From:  Author:

 Conductive fabrics have gained numerous attention for the promising applications in artificial skins, wearable electronic devices and bionic soft robots due to their excellent flexibility and portability. Surface modification, including chemical and physical methods, has been widely employed as the effective approaches to introduce functional materials such as transition metals, carbon materials and conductive polymers onto fabrics to prepare conductive fabrics. Silver, as a member of transition metals, is the most commonly modifier with the highest electrical conductivity (6.3×107 S/m) and excellent antibacterial properties (inhibiting the metabolism and reproduction of more than 650 kinds of bacteria). At present, most researches paid their attention on how to deposit silver nanomaterials with various nano-structure (i.e. particles, wires, plates) on fiber substrate. For instance, Nateghi et al. synthesized silver nanowires (AgNWs) by a polyol process and then coated AgNWs onto cotton fabrics via a “dipping and drying” to endow low resistivity (27.4 Ω/sq. after 10 times of dip coating) of cotton fabrics. Abu et al. reported a strategy to enhance electrical conductivity of cotton fabric through embedding mixture system with silver nanowires, ribbons, plates in cotton fibers, and the resulting electrical resistance of the fabric was between 2–10 Ω/sq. Kwak et al. fabricated high-conductive fabric successfully by in-situ coating cotton with AgNPs by simple thermal at low temperature of 130 °C, and the obtained fabric shows excellent conductivity with electric resistance as low as 3.92 Ω. It is noteworthy that, most of these works chose cotton fibers as substrates owing to the intrinsic good hydrophilicity of the cellulose substrate. However, changing into hydrophobic fabrics as the substrate, it will be a big challenge to deposit silver nanomaterials stably. Furthermore, silver, as inorganic substance, possesses low surface activity resulting in the difficulty of AgNPs adhering to fabric substrate. Hence, for the surface modification of functional fabric (especially for hydrophobic fabrics), wear-resistant performance is definitely a crucial criterion to assess the durable of functional fabric wear resistance. To our knowledge, wear-resistance of silver modified fabric was rarely carried out in previous works.

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