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以钛酸四丁酯为钛源、Al(NO3)3为铝盐,采用静电纺丝法在600℃焙烧条件下制备出铝盐掺杂TiO2棒状纤维。利用扫描电子显微镜、透射电子显微镜和X射线衍射仪等对纤维的形貌和组成进行了表征。研究了室温下铝盐掺杂TiO2纤维对NOx的气体敏感性能,并对其气敏机理进行了分析。结果表明:铝盐掺杂TiO2纤维为一维棒状结构,直径约为200nm。在室温条件下对NOx有较好的气敏响应,响应时间最短为6s,最低检测体积分数可达9.7×10–7。锐钛矿相的存在有利于NOx的吸附–脱附。铝盐掺杂TiO2纤维大幅提高了对NOx的气敏响应灵敏度,是一种在室温条件下极具潜力的气敏材料。
Titanium tetrabutoxide as titanium source and Al (NO3) 3 as aluminum salt were prepared by electrospinning at 600 ℃ for aluminum-doped TiO2 rod fibers. The morphology and composition of the fibers were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The gas sensitivities of aluminum-doped TiO2 fibers to NOx at room temperature were investigated and the gas sensing mechanism was also analyzed. The results show that the aluminum salt doped TiO2 fiber is a one-dimensional rod-like structure with a diameter of about 200 nm. NOx has a better gas sensing response at room temperature, the shortest response time is 6s, and the minimum detection volume fraction can reach 9.7 × 10-7. The existence of anatase phase is favorable for the adsorption and desorption of NOx. Alkali-doped TiO2 fibers greatly improve the sensitivity to NOx gas sensitivity, is a gas potential under room temperature gas-sensitive materials.