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掺杂合成纳米α-Fe₂O₃粉体及其气敏性能研究

Study on adulteration synthesis and gas sensitive properties of nanometer α-Fe₂O₃ powders

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【Author】 CHEN Si-shun~(1,2),CHEN Xin-hua~1,DING Ming-jie~1,NIU Xin-shu~2(1.Department of Light Engineering,Luohe Vocational and Technical College,Luohe 462002,China;2.Key Laboratory of Environmental Science and Engineering,Education Commission of Henan,College of Chemical & Environmental Science,Henan Normal University,Xinxiang 453002,China)

【机构】漯河职业技术学院轻工系；河南师范大学化学与环境科学学院河南省高等学校环境科学与工程重点学科开放实验室河南漯河462002；河南师范大学化学与环境科学学院河南省高等学校环境科学与工程重点学科开放实验室；河南新乡453002；河南漯河462002；

【摘要】采用溶胶凝胶法制备Eu2O3-Fe2O3(Eu2O3的质量分数为0~7%)纳米粉体材料,利用X射线衍射仪、透射电镜等测试手段分析了材料的微观结构,并进行了气敏性能测试。结果表明:合成的产物颗粒均匀、粒径细小。其中,质量分数为5%Eu2O3的烧结型气敏元件在145℃条件下对H2S有较高的灵敏度、较好的选择性及响应恢复特性,线性检测范围较宽,有望研制成气敏性能较为优异的H2S敏感材料。更多还原

【Abstract】 The nanocrystals of Eu-doping α-Fe₂O₃（quality fraction of Eu₂O₃ is 0⁷ %） are prepared by sol-gel method in the citric acid system.By means of XRD and TEM,microstructure is analyzed.The gas-sensing properties of sensors are also measured.Obtained results show that the grain size becomes reqular and smaller,the sensor has high sensitivity,good selectivity,response-recovery characteristic and wide linear measurment range to H₂S when quality fraction of Eu₂O₃ is 5 % and optimum working temperature is（145 ℃）.It is hopeful of developing into a new type of H₂S sensing material.更多还原