Solid-State Method Synthesis of SnO?-Decorated g-C?N? Nanocomposites with Enhanced Gas-Sensing Property to Ethanol.

ABSTRACT: SnO?/graphitic carbon nitride (g-C?N?) composites were synthesized via a facile solid-state method by using SnCl?·5H?O and urea as the precursor. The structure and morphology of the as-synthesized composites were characterized by the techniques of X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), thermogravimetry-differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), and N? sorption. The results indicated that the composites possessed a two-dimensional (2-D) structure, and the SnO? nanoparticles were highly dispersed on the surface of the g-C?N? nanosheets. The gas-sensing performance of the samples to ethanol was tested, and the SnO?/g-C?N? nanocomposite-based sensor exhibited admirable properties. The response value (Ra/Rg) of the SnO?/g-C?N? nanocomposite with 10 wt % 2-D g-C?N? content-based sensor to 500 ppm of ethanol was 550 at 300 °C. However, the response value of pure SnO? was only 320. The high surface area of SnO?/g-C?N?-10 (140 m²·g-1) and the interaction between 2-D g-C?N? and SnO? could strongly affect the gas-sensing property.

SUBMITTER: Cao J 

PROVIDER: S-EPMC5553421 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature