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[Display omitted] • Cu 2 O NPs are synthesized on nanofibers via a surfactant-free gas-phase reduction. • Uniform loading of Cu 2 O NPs on nanofibers solves the problem of aggregation. • PVB-Cu 2 O@TA with a 3D structure has excellent and stable photothermal properties. • The composite coating can remain at 57 °C after five switches and heal within 100 s. • Combined self-healing effect is acted by healing agent release and scratch closure. The increasing attention to metal corrosion has stimulated the demand for intelligent self-healing coatings that respond rapidly to environmental changes in corrosive media to protect metal substrates. This study fabricates highly loaded yet well dispersed polyvinyl butyral-cuprous oxide @ tannic acid (PVB-Cu 2 O@TA) multifunctional nanofibers. TA as the core, PVB as the shell, and cuprous oxide nanoparticles uniformly growing on three-dimensional (3D) nanofibers cooperatively exhibit excellent self-healing performance. Near-infrared (NIR) -induced photothermal self-healing coatings are prepared by embedding PVB-Cu 2 O@TA nanofibers into the acrylic resin. When NIR irradiates the composite coating composed of PVB-Cu 2 O@TA, the photothermal effect generated by the plasmonic Cu 2 O NPs effectively heats the coating and heals the cracks within 100 s, enabling multiple cycle-healing properties. In addition, TA as a healing agent loaded in core–shell nanofibers effectively heals the scratches and inhibits the corrosion behavior of carbon steel. The combination of extrinsic and intrinsic healing mechanisms makes the coating own a more vital healing ability, thus providing preferable protective performance. More importantly, 3D-network-structured nanofibers could improve the mechanical properties of the composite coating. PVB-Cu 2 O@TA nanofibers have excellent synergistic repeated self-healing and good mechanical properties, which have significant application prospects in the field of marine and aviation corrosion protection. [ABSTRACT FROM AUTHOR]

A strategy to improve the number of self-healing cycles of traditional coatings was proposed, in which photothermal nanomaterials were integrated into the self-healing coating to effectively adjust the photothermal response temperature of the coating. Herein, an interface adjustable photothermal heterojunction composed of Bi 2 MoO 6 and hydrothermal carbonation carbon (HTCC) was designed and integrated into polydimethylsiloxane (PDMS) to improve the photothermal self-healing efficiency of the coating. It is found that, by adjusting the interface combination degree, the heterojunction has a broader range of visible light absorption, more photogenerated electron hole pairs, a minor interfacial transfer resistance, and a longer lifetime of photogenerated electron hole pair, causing more photogenerated electrons and holes to have more chances to cross the heterojunction interface and release more heat. The photothermal tests indicate that the temperature of the PDMS-Bi 2 MoO 6 @HTCC-0.05 coating quickly reached about 75 °C and exhibited an excellent self-healing performance. The electrochemical tests demonstrate the multiple cycles self-healing performance of the PDMS-Bi 2 MoO 6 @HTCC-0.05 coating. In addition, the molecular dynamics calculation results also verified that the PDMS exhibited a higher level of self-healing performance after integrating Bi 2 MoO 6 @HTCC-0.05 nanosheets. The concept of adjustable photothermal response temperature coating will enrich the realization of multiple self-healing cycles. [Display omitted] • Interfacial controllable Bi 2 MoO 6 @HTCC were synthesized. • The photothermal response temperature can be controlled by interface. • The photocatalyst was successfully integrated into PDMS coatings. • The composite coating has cyclic photothermal self-healing performance. • The composite coating has superior corrosion protection. [ABSTRACT FROM AUTHOR]