▎ 摘　　要

NOVELTY - Preparing layered bridging cross-linked heterostructure flexible nano-coating comprises e.g. (i) preparing organic thermoelectric nanowire dispersion liquid by: (ia) adding surfactant, organic thermoelectric monomer and dopamine into solvent A with pH of 1-5 to obtain a mixed solution A; (ib) dropwise adding oxidizing agent solution to mixed solution A to carry out a mixed reaction for 6-24 hours to obtain mixed reaction solution A; and (ic) centrifuging the mixed reaction solution A, washing the precipitate and uniformly dispersing it in solvent B for later use, to obtain an organic thermoelectric nanowire dispersion liquid; (ii) preparing viscous organic thermoelectric nanowires by: (iia) adding a viscous organic polymer solution to organic thermoelectric nanowire dispersion liquid; and (iib) adding a catalyst, adjusting the reaction temperature, and dropping a cross-linking agent solution to carry out a cross-linking reaction to obtain a mixed reaction solution B. USE - The nano-coating is useful for thin films, fabric, and polymer foam material. ADVANTAGE - The nano-coating: has sensitive, accurate and repeatable temperature sensing function, which can actively monitors the heating stage before a flame occurs, and can respond quickly to send an early warning signal when high temperature or burning occurs; has excellent flame retardancy, good adhesion and flexibility, and can be applied to various flammable substrates by casting, brushing, spraying or dipping. DETAILED DESCRIPTION - Preparing layered bridging cross-linked heterostructure flexible nano-coating comprises (i) preparing organic thermoelectric nanowire dispersion liquid by: (ia) adding surfactant, organic thermoelectric monomer and dopamine into solvent A with pH of 1-5 to obtain a mixed solution A; (ib) dropwise adding oxidizing agent solution to mixed solution A to carry out a mixed reaction for 6-24 hours to obtain mixed reaction solution A; and (ic) centrifuging the mixed reaction solution A, washing the precipitate and uniformly dispersing it in solvent B for later use, to obtain an organic thermoelectric nanowire dispersion liquid; (ii) preparing viscous organic thermoelectric nanowires by: (iia) adding a viscous organic polymer solution to organic thermoelectric nanowire dispersion liquid; (iib) adding a catalyst, adjusting the reaction temperature to 40-120°C, and dropping a cross-linking agent solution to carry out a cross-linking reaction for 4-24 hours to obtain a mixed reaction solution B; (iic) centrifuging the mixed reaction solution B, washing the precipitate and uniformly dispersing it in the solvent C for later use, to obtain a viscous organic thermoelectric nanowire dispersion liquid; and (iii) preparing nano-coating by: (iiia) dispersing the layered conductive nanomaterial in the solvent C to prepare a layered conductive nanomaterial dispersion liquid; (iiib) uniformly mixing the layered conductive nanomaterial dispersion liquid with viscous organic thermoelectric nanowire dispersion liquid obtained in step (ii), to obtain a mixed dispersion liquid; (iiic) coating the mixed dispersion liquid on the flammable substrate, and drying to obtain a layered bridging and crosslinking heterostructure flexible nano-coating. An INDEPENDENT CLAIM is also included for layered bridging cross-linked heterostructure flexible nano-coating is prepared by above mentioned method.