Highly sensitive formaldehyde sensors based on polyvinylamine modified polyacrylonitrile nanofibers

摘要: A novel, sensitive, selective, and reproductive formaldehyde sensor has been developed by coating polyvinylamine (PVAm) modified electrospun polyacrylonitrile (PAN) nanofibrous membranes on quartz crystal microbalance (QCM) for the first time. Benefiting from abundant primary amine groups in PVAm, large specific surface area, high porosity hierarchal structure of PAN nanofibers, strong interaction between PVAm molecule formaldehyde, as-prepared QCM sensors achieved an extremely low detection limit 500 ppb a remarkably short period time (120 s). Moreover, sensitivity fibrous based are 2.5 times higher than that flat film-based ones when upon exposure to formaldehyde. Furthermore, possess excellent reproducibility, reversibility, good selectivity virtue reversible nucleophilic addition reaction group PVAm. Hence, such promising could not only potentially allow monitoring gaseous but also pave way designing development novel sensing systems functionalized membranes.