水热法制备不同形貌TiO_2微球及其气敏性能  

Preparation and ethanol gas-sensing properties of TiO_2 microspheres with different constituents

作　　者：魏曙光[1] 陈枫[1] 黄苏萍[2] 肖奇[1] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2015年第4期631-635,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51102285)

摘　　要：采用水热法制备具有不同形貌组成单元的TiO2微球,并用XRD和FE-SEM对样品进行表征。XRD结果表明,以纳米颗粒为组成单元的样品为纯金红石相,而以纳米棒为组成单元的样品为金红石和板钛矿的混合物相;FE-SEM表明微球分别以纳米棒、纳米颗粒为组成单元。气敏测试结果表明,以纳米颗粒为组成单元的TiO2气敏元件具有最高的灵敏度,该元件在350℃下对100×10-6乙醇的灵敏度可达72.5,其响应时间为28 s,恢复时间为19 s,检测下限可达到10×10-6。TiO2 microspheres with different constituents were prepared by a simple hydrothermal process combined with post-annealing. The samples were characterized by X-ray diffraction （XRD） and Field Emission Scanning Electron Microscope （FE-SEM）. The XRD patterns reveal that TiO2 microspheres composed of nanoparticles are futile, and TiO2 microspheres composed of nanorods are rntile and brookite. The FE-SEM patterns show that TiO2 microspheres are composed of nanorods and nanoparticles, respectively. TiO2 microspheres composed of nanoparticles have the highest response with a value of 72.5, and the response and recovery time to 100×10-6ethanol are 28 s and 19 s at 350℃, respectively. The detection limit of ethanol is 10× 10-6.

关 键 词：TiO2微球 形貌 气敏 乙醇 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TQ174[自动化与计算机技术—控制科学与工程]