Area-selective and precise assembly of metal organic framework particles by atomic layer deposition induction and its application for ultra-sensitive dopamine sensor

Weak interactions, non-uniformity and powdery assemblies limit the wide application of metal organic framework (MOF) in devices. Here we report a new strategy for area-selective assembly of MOF particles to prepare a thin film with the assistance of atomic layer deposition (ALD). Self-assembled hierarchically porous Fe-based MOF (PCN-333) films were formed on both flat and complex three-dimensional (3D) substrates by combining gas and liquid fabrication approaches, and can be precisely patterned with photolithography. We demonstrate that the PCN-333 film obtained possesses excellent electrochemical activity and can be applied in dopamine sensing for ultra-high sensitivity of 4637.78 µA mM−1 cm−2 with a wide linear range and a low limit of detection. Moreover, the PCN-333 film composite achieves a function of good selectivity of distinguishing dopamine and ascorbic acid. This strategy is promising to prepare MOF film-based on-chip devices with advanced functions.