摘要
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.
A new type Pd nanoclusters/TiO2 nanotubes composite structure hydrogen sensor was made of Pd nanoclusters, TiO2 nanotubes and Ag as the electrodes. Microstructure of the sensor was characterized by scanning electron microscope （SEM）, and it showed that the Pd nanoclusters were deposited on the top of TiO2 nanotubes in isolation. Crystalline of composite analyzing was characterized by X-ray diffraction （XRD）, and it showed that amorphous TiO2 has been converted into anatase and futile completely after annealing at 500℃. The hydrogen sensing characteristic was tested in series of hydrogen concentration at room temperature, and it revealed that the sensor has excellent response performance. The response time and sensitivity of the sensor was 3.8 s and 92.05%, respectively, at 8000 ppm hydrogen concentration. It was demonstrated that the fast response and high sensitivity hydrogen sensor can be made by using the Pd nanoclusters/TiO2 nanotubes composite structure.
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2017年第4期418-422,共5页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:61474016
61101030
61371046
61421002
61405026)资助项目
