【摘要】 采用热蒸发法,以CuO为催化剂在900℃合成了超长的ZnO瓶刷状纳米结构。所得样品通过X射线衍射和扫描电子显微镜进行表征,发现该毛刷结构是由大量钉状纳米棒组成。同时,对室温下ZnO瓶刷状纳米结构在相对湿度为5%~97.6%不同环境中的湿敏特性进行了研究。结果表明:该ZnO瓶刷状纳米结构的湿敏响应时间约为80s,恢复时间约为100s,具有较快的响应和恢复时间。通过场发射测试,该ZnO纳米结构的开启电场为0.84V/μm,阈值电场为1.39V/μm。这表明该纳米结构在传感器设备和平板显示器具有潜在的应用价值。更多还原

【Abstract】 Ultra-long bottlebrush-like ZnO nanostructures were synthesized via conventional thermal evaporation method at 900℃ using CuO as catalyst.The obtained samples were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).This novel structure,called nanobrush,was composed of a long central trunk and lots of secondary branches which were nail-shaped nanorods.The humidity sensing properties of products were investigated as materials in different static air of 5%~97.6% relative humidity(RH)at room temperature(26℃).The response and recovery time of nanobrush-based sensor were about 80 and 100s,respectively.The sensor based on ZnO nanobushes showed rapid response and recovery,prominent stability,and good repeatability.Field emission(FE)measurements demonstrated that the nanobushes possessed good performance with a turn-on field of 0.84V/μm and a threshold field of 1.39V/μm.ZnO nanostructure could possess a potential application in sensor devices and FE-based flat panel displays.更多还原