Direct growth of two-dimensional phthalocyanine-based COF on Cu-MOF to construct a photoelectrochemical-electrochemical dual-mode biosensing platform for high-efficiency determination of Cr(iii)

A two-dimensional phthalocyanine-based COF (CoPc-PT-COF) was in situ grown on a Cu-MOF substrate to construct a COF@MOF heterostructure as a biosensing platform.