Fe_2O_3/MWCNTs复合材料的制备及其NO_x气敏性能  

Synthesis of Fe_2O_3/MWCNTs composites and their NO_x gas sensitivity

作　　者：李丽[1,2] 高军[3] 张国[1,2] 李卉[1,2] 刘艳伟[2] 宫丽红[3] 史克英[2] 

机构地区：[1]黑龙江大学化学化工与材料学院,黑龙江省高校高效转化的化工过程与技术重点实验室,哈尔滨150080 [2]黑龙江大学化学化工与材料学院,功能无机材料化学教育部重点实验室,哈尔滨150080 [3]哈尔滨师范大学化学系,哈尔滨150025

出　　处：《黑龙江大学自然科学学报》2014年第1期80-86,共7页Journal of Natural Science of Heilongjiang University

基　　金：黑龙江省教育厅科学技术研究(重点)项目(12511z024)

摘　　要：采用沉淀法制备了Fe2O3/MWCNTs复合材料。通过X-射线衍射分析(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等测试手段对所合成材料进行了表征。结果表明,合成的Fe2O3/MWCNTs复合材料均由碳纳米管与氧化铁颗粒组成,Fe2O3粒子尺寸较均匀,其颗粒大小约为5 nm。在室温条件下,Fe2O3/MWCNTs复合材料对NOx具有较好的气敏性能,当NOx浓度为9.7×10-7时,复合材料对NOx的灵敏度为6.13%,响应时间为38 s。分析其原因主要是合成材料中Fe2O3的主要相态是呈p型半导体特性的γ-Fe2O3,与吸附空气中氧气呈现出p型半导体特性的MWCNTs复合时产生倍增效应的结果。Fe203/Muhi-Walled Carbon Nanotubes （MWCNTs） composites were prepared by precip- itation method. The composites were characterized by X-ray diffraction analysis （XRD） , scanning elec- tronic microscope （SEM）, transmission electron microscope （TEM）. F%O3/MWCNTs composites were composed of Fe203 particles and MWCNTs. The results showed that the size of F%O3 particles was about 5 nm and the particles were evenly distributed. NOx gas sensing properties experiments showed that Fe203/MWCNTs composites had a good gas sensing performance at room temperature. When the concen- tration of NOx is 9.7 x 10 7, the sensitivity and response time of Fe203/MWCNTs composites were about 6. 13% and 38 s, respectively. This could be attributed to multiplication effect of MWCNTs and Fe203. The main phase of Fe203 is -Fe203. -Fe203 and MWCNTs both showed p-type semiconducting proper- ties when absorbed oxgen in air.

关 键 词：关键词 FE2O3 MWCNTs复合材料 NOx 气敏性能 

分 类 号：O647[理学—物理化学]