Synthesis of g-C 3N 4 nanosheets decorated flower-like tin oxide composites and their improved ethanol gas sensing properties

摘要

AbstractThe g-C3N4nanosheets decorated three-dimensional (3D) hierarchical flower-like SnO2nanocomposites were synthesized via a facile hydrothermal method by using the g-C3N4and SnCl2·2H2O as the precursors. The structure and morphology of the as-synthesized samples were characterized by the X-ray powder diffraction (XRD), electron microscopy (FESEM and TEM), N2sorption, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectrometer (FT-IR) techniques. It is supposed that g-C3N4nanosheets act as a template in the hydrothermal process, accelerating the preferential growth of SnO2nanocrystals and preventing the agglomeration of the SnO2nanoparticles. The gas sensing performances of the as-synthesized samples to ethanol vapor were tested, and the response of the sensor based on 3?wt.% g-C3N4decorated SnO2composite to 500?ppm ethanol vapor was 360?at 300?°C, which was much higher than that of pure flower-like SnO2based sensor. The improved ethanol gas sensing property is proposed to relate to the good conductivity of g-C3N4, high specific surface area and interactions between g-C3N4and SnO2.Graphical abstractDisplay OmittedHighlights?Flower-like SnO2/g-C3N4composite has been developed.?Flower-like SnO2were coupled by a lamellar structure 2D g-C3N4.?The as-prepared composites possess much higher response of ethanol than pure SnO2.?Flower-like SnO2/g-C3N4composite will be an ideal candidate for ethanol gas sensor application.]]>