Abstract
In the paper, mesoporous SnO 2 nanopowders were synthesized via a simple and mild SnCl 4 hydrolysis process using cationic surfactant (cetyltrime thylammonium bromide, CTAB: CH 3(CH 2) 15N +(CH 3) 3Br −) as structure directing agent and ammonia as an alkali source at room temperature, combined with a subsequent calcination process. The products were characterized by X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and nitrogen adsorption–desorption experiment. A gas sensor was fabricated from the as-prepared mesoporous SnO 2 nanopowders and used to test the response to different concentrations of ethanol, methanol, hexane, NH 3, H 2 and CO at different operating temperatures. The results showed that the mesoporous SnO 2 sensor exhibited high sensitivity, good selectivity and quick response–recovery characteristics to ethanol, implying the potential application of the sensor for detecting ethanol.
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