Abstract
Highly selective and remotely communicable nitrogen dioxide(NO2)sensing may contribute to future In-ternet of Things in environmental monitoring.However,room-temperature NO2 sensing materials such as carbon materials is still less than satisfactory due to their insensitive interaction with target gas.Here,polyethylene imine functionalized three-dimensional(3D)carbon framework(PEI/C framework)has been developed for enhanced selective NO2 sensing,via combined template synthesis and subsequent dop-ing.Typically,the 3D PEI/C framework is observed porous shape with irregular coating.Beneficially,the response of C framework to NO2 increases while those of interfering gases decrease after being function-alized with PEI.Remarkably,the sensor prototypes show a 100 ppb-concentration detection limit at room temperature.Theoretically,such excellent NO2 sensing is attributed to the large specific surface ratio of porous 3D PEI/C framework,in which PEI serves as an active layer for target NO2,while a passivated one for interfering gases.Practically,such PEI/C framework sensor prototype is simulated for NO2 sensing de-vice and communicated with a smartphone,showing great potential in future intelligent environmental monitoring.
维普
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