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A kind of carbazole‐based covalent triazine framework (CTF‐Cz) has been synthesized from a carbazole derivative. The porous polymer can efficiently adsorb probe molecules due to the strong intermolecular interactions caused by the polar triazine moiety. CTF‐Cz directly serves as the surface‐enhanced Raman scattering substrate without any post proceeding techniques. The enhancement factor of CTF‐Cz...