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将TiO_2纳米管和Pd纳米团簇相复合,用金属Ag作电极,制备出一种新型Pd纳米团簇/TiO_2纳米管复合结构氢传感器,采用SEM对复合结构的微结构进行表征,分析表明Pd纳米团簇孤立地沉积在TiO_2纳米管的管口顶端,XRD对复合材料的晶型分析表明,经过500℃的退火处理,无定型的TiO_2已经转变为锐钛矿和金红石晶型,在室温下,这种复合结构的氢气传感器对不同浓度的氢气具有优异的响应性能,在8000 ppm的氢气浓度下,传感器的响应时间为3.8s,灵敏度为92.05%,利用TiO_2纳米管的表面结构和金属Pd团簇的复合结构特性,可以制备得到在室温下具有响应时间短、灵敏度高等特点的氢气传感器.
TiO 2 nanotubes and Pd nanocomposites were composited with a metal Ag electrode to prepare a new type of Pd nanoclusters / TiO 2 nanotube composite structure of hydrogen sensor, the microstructure of the composite structure was characterized by SEM, the analysis showed that Pd Nanoclusters were deposited on the tip of TiO 2 nanotubes in isolation. The crystal structure of the composites by XRD showed that the amorphous TiO_2 had been transformed into anatase and rutile crystal after annealing at 500 ℃. , The hydrogen sensor with the composite structure has excellent response performance to different concentrations of hydrogen. Under a hydrogen concentration of 8000 ppm, the response time of the sensor is 3.8 seconds and the sensitivity is 92.05%. By utilizing the surface structure of the TiO 2 nanotube and the metal Pd The complex structure of the cluster can be prepared to have a hydrogen sensor with short response time and high sensitivity at room temperature.