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Flower-like SnO 2 /g-C 3 N 4  nanocomposites were synthesized via a facile hydrothermal method by using SnCl 4 ·5H 2 O and urea as the precursor. The structure and morphology of the as-synthesized samples were characterized by using the X-ray powder diffraction (XRD), electron microscopy (FESEM and TEM), and Fourier transform infrared spectrometer (FT-IR) techniques. SnO 2  displays the unique 3D flower-like microstructure assembled with many uniform nanorods with the lengths and diameters of about 400–600 nm and 50–100 nm, respectively. For the SnO 2 /g-C 3 N 4  composites, SnO 2  flower-like nanorods were coupled by a lamellar structure 2D g-C 3 N 4 . Gas sensing performance test results indicated that the response of the sensor based on 7 wt. % 2D g-C 3 N 4 -decorated SnO 2  composite to 500 ppm ethanol vapor was 150 at 340 °C, which was 3.5 times higher than that of the pure flower-like SnO 2  nanorods-based sensor. The gas sensing mechanism of the g-C 3 N 4 nanosheets-decorated SnO 2  flower-like nanorods was discussed in relation to the heterojunction structure between g-C 3 N 4  and SnO 2 .

Synthesis and Enhanced Ethanol Gas Sensing Properties of the g-C3N4 Nanosheets-Decorated Tin Oxide Flower-Like Nanorods Composite