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Probe reactivity has long been consideredto play a key role inartificial nanochannel sensors, but systematic studies of membranewettability on detection performance are currently lacking. Inspiredby biological aquaporins, we developed an effective strategy to regulatethe hydrophilic/hydrophobic balance by the controllable in situ assemblyof coordination polymers （CPs） using BDC-NH2 on anodicaluminum oxide （AAO） nanochannels to promote HCHO detection. We foundthat the hydrophobic/hydrophilic balance in CP/AAO heterosomes playssignificant roles in the effective detection of HCHO. The hydrophobicAAO barrier layer is necessary to support the confinement effect,while the hydrophilic CP surface is favorable for HCHO to access thechannels and then condense with the responsive amine to generate anew imine. The optimized CP/AAO Janus device shows excellent performancein the quantitative analysis of HCHO over a wide range from 100 pMto 1 mM by monitoring the rectified ionic current.
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