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单斜相TiO2的制备及气敏性能

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Abstract:

采用简单水热法,制备出单斜相TiO2气敏材料,即TiO2(B)。利用丝网印刷法制备出气敏元件。借助于X射线衍射、扫描电子显微镜和透射电子显微镜分析材料的组织结构和形貌,研究了气敏元件在200~300℃对低体积分数H2的气敏性能。结果表明经过180℃、18h的水热反应,并在400℃烧结4h能制备出较为均匀的TiO2(B)纳米纤维,纤维为实心结构,长度约为5μm,外径为30~50nm。在300℃,随气体体积分数增加,气敏元件的灵敏度也随之增大,当H2的体积分数从1×10-6提高到100×10-6时,TiO2(B)的灵敏度从2升高到14。TiO2(B)对H2的灵敏度优于钛酸对H2的灵敏度。当温度从200℃升高到300℃时,TiO2(B)对体积分数为10×10-6H2的灵敏度从1升高到13。

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