论文部分内容阅读
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℃、18 h的水热反应,并在400℃烧结4 h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30～50 nm。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10×10-6 H2的灵敏度从1升高到13。
Using simple hydrothermal method, a monoclinic TiO2 gas sensing material, namely TiO2 (B), was prepared. Gas sensing element was prepared by screen printing method. The structure and morphology of the material were analyzed by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The gas sensing properties of the gas sensor at low volume fraction H2 at 200-300 ℃ were investigated. The results showed that TiO2 (B) nanofibers could be prepared by hydrothermal reaction at 180 ℃ for 18 h and sintering at 400 ℃ for 4 h. The fibers were of solid structure with a length of 5 μm and an outer diameter of 30-50 nm. At 300 ℃, with the increase of gas volume fraction, the sensitivity of gas sensing element also increases. When the volume fraction of H2 is increased from 1 × 10-6 to 100 × 10-6, the sensitivity of TiO2 (B) increases from 2 liters High to 14. The sensitivity of TiO2 (B) to H2 is better than that of titanic acid to H2. When the temperature rises from 200 ℃ to 300 ℃, the sensitivity of TiO2 (B) to 10 × 10 -6 H 2 increases from 1 to 13.