【摘要】 以Eu₂O₃和Fe（OH）₃为反应前驱体,以NaCl为介质,采用固相反应法合成了稀土复合氧化物EuFeO₃纳米粉体。分别用XRD和TEM对粉体的物相和形貌进行了表征,并测试了其气敏性能。结果表明:反应物料于1000℃煅烧4 h可获得纯相EuFeO₃纳米粒子;在工作温度320℃时,以该纯相纳米EuFeO₃材料为基的元件对丙酮的响应强且选择性好,其灵敏度与丙酮气体的浓度的对数之间有良好的线性关系,元件对浓度为50 ppm(10^-6)丙酮气体的灵敏度达26.2,响应-恢复时间为14 s和23 s。更多还原

【Abstract】 Rare earth compound oxides EuFeO₃ nanopowders were prepared via a solid reaction process with Eu₂O₃ and Fe（OH）₃ as precursors and Na Cl as reaction medium. The powders were characterized by XRD and TEM, and their gas-sensing characteristics were investigated. The results demonstrated that the pure EuFeO₃ could be obtained after calcined at 1000 ℃ for 4 h. At 320 ℃, the EuFeO₃ sensors exhibited high response as well as excellent selectivity towards acetone and the sensitivity had good linear relationship with the logarithm of the concentration of acetone. The sensitivity of the EuFeO₃ sensors in 50 ppm acetone was 26.2 and the response time and recovery time was 14 s and 23 s, respectively.更多还原