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A novel formaldehyde sensor was fabricated by electrospinning deposition of nanofibrous polyethyleneimine (PEI)/poly(vinyl alcohol) (PVA) membranes as sensitive coatings on quartz crystal microbalance (QCM).The morphology of the porous three-dimensional PEI/PVA membranes comprising fibers with diameter of 40 nm-l.8 μm was controllable by tuning the compositions of polymers and solvents in PEI/PVA solutions.The resultant sensors showed a fast response to formaldehyde and a linear relationship upon increasing the formaldehyde concentrations due to the reversible interaction between formaldehyde molecules and amine groups of PEI.The sensor responses were reversible and reproducible towards formaldehyde in the concentration range of 10-255 ppm at room temperature.