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Self-healing is an intrinsic property of living organisms.Imparted with self-healing ability,artificial materials can restore their original mechanical stability and function after damage.Recently,considerable effort has been devoted to the fabrication of various self-healing materials with the aims to reduce raw material consumption,decrease replacement and maintenance costs,and improve functional reliability.Generally,self-healing of materials can be achieved in different ways.One frequently employed approach for extrinsic self-healing materials is the release of healing agents compartmentalized in microcapsules or microvascular networks by crack propagation.Intrinsic self-healing materials achieve repair through the inherent reversibility of chemical bonds and physical interactions between the damaged interfaces,for examples,reversible covalent bonds,noncovalent bonds,and molecular diffusion.Layer-by-layer (LbL) assembly,which involves alternate deposition of species with complementary chemical interactions,is a substrate-independent method for the fabrication of various kinds of coatings with controlled properties.1 In this presentation,I will show that LbL assembly is promising for fabricating both extrinsic and intrinsic self-healing coatings.