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利用聚乙烯吡咯烷酮(PVP)作为表面活性剂,将四氯化锡(SnCl_4)溶解在甲醇溶液中,再通过溶剂热法,制备了多孔氧化锡(SnO_2)纳米球。采用X射线衍射(XRD)仪和扫描电子显微镜(SEM)对合成材料的结构和形貌进行了表征。结果表明,SnO_2纳米球为分布均匀的多孔球。同时,采用旁热式气敏元件结构对样品进行氢气(H_2)敏感性能研究,测试结果证明制作的气体传感器对氢气表现出良好的气敏特性,在最佳工作温度250℃下对体积分数10~(-4)氢气的响应可达到6,最低体积分数检测极限为5×10~(-6),并且响应时间和恢复时间分别为2 s和4 s。
Porous tin oxide (SnO 2) nanospheres were prepared by solvothermal method using polyvinylpyrrolidone (PVP) as surfactant, tin tetrachloride (SnCl_4) dissolved in methanol solution. The structure and morphology of the composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the SnO_2 nanospheres are well-distributed porous spheres. At the same time, the hydrogen (H 2) sensitivity of the sample was studied by using the structure of the side-heated gas sensor. The test results show that the gas sensor has a good gas sensing property for hydrogen gas. Under the optimal working temperature of 250 ℃, The response of ~ (-4) hydrogen can reach 6, the detection limit of the lowest volume fraction is 5 × 10 -6, and the response time and recovery time are 2 s and 4 s, respectively.