采用 sol-gel法,以钛酸丁酯、四氯化锡为前驱体制备了不同掺杂量的 SnO2-TiO2纳米粉末,样品经300,500,700和900℃退火后,利用浸渍提拉法,在Al2 O3陶瓷管表面制备了SnO2-TiO2厚膜。通过 XRD和SEM对制备的纳米粉末的物相、形貌进行表征,静态配气法对其气敏性能进行测试,并结合分子轨道理论探讨了气敏机理。实验结果表明,经700℃退火的4％(原子分数)掺杂的SnO2-TiO2气敏元件,对乙醇气体具有很好的选择性,在工作温度为63℃时,对乙醇气体的灵敏度可达1903,响应-恢复时间分别为1和3 s,所制备的气敏元件有望用于乙醇气体的实用化检测。
The SnO2-doped TiO2 nano-powders were prepared by the sol-gel method with precursors of stannic chloride,butyl titanate,and then with 300,500,700 and 900 ℃ annealing process.SnO2-doped TiO2 thick film was prepared by the dipping pulling method on surface of Al2 O3 ceramic tube.And the phase and morphology of the preparation powder were characterized by XRD and SEM,the gas sensitivities were tested by the method of static gas distribution,and based on theory of molecular orbital level,the gas-sensing mechanism was further discussed.The results show that the gas sensor prepared by after 700 ℃ annealing 4at% SnO2-doped TiO2 pow-der has a good selectivity to ethanol gas,when working temperature at 63 ℃,the sensitivity of ethanol gas was up to 1 903,and the response and recovery time are 1 and 3 s,respectively,and it can be used in practical detec-tion of ethanol gas.
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