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以Nd2O3或Gd2O3和FeCl3·6H2O为主要原料,以NaCl为助熔剂,利用固相反应法制备了NdFeO3和GdFeO3纳米晶。用XRD、TEM分别对产品进行了物相和形貌表征,将获得的纯相样品制成烧结型气敏元件,研究了其对丙酮、甲醛、乙醛、乙醇和乙酸的敏感性能。结果表明:纯相纳米NdFeO3和GdFeO3的制备条件分别为900℃煅烧2h与1000℃煅烧4h;其气敏性能测试结果显示,基于NdFeO3材料的元件对被试气体在310℃时均有较强的响应,其中对1000ppm(10-6)酒精灵敏度高达187,基于GdFeO3材料的元件对1000ppm的丙酮、乙酸和甲醛最佳工作温度为260℃,其中对1000ppm甲醛灵敏度达67.1,且该元件在315℃时对1000ppm酒精和乙醛有较强的响应,其中对酒精的灵敏度达90.8。
The NdFeO3 and GdFeO3 nanocrystals were prepared by solid-state reaction using Nd2O3 or Gd2O3 and FeCl3 · 6H2O as the main raw materials and NaCl as the flux. The phase and morphology of the product were characterized by XRD and TEM. The pure phase samples were made into sintered gas sensors, and their sensitivity to acetone, formaldehyde, acetaldehyde, ethanol and acetic acid were studied. The results show that the preparation conditions of pure phase NdFeO3 and GdFeO3 are calcined at 900 ℃ for 2h and calcined at 1000 ℃ for 4h, respectively. The gas sensitivity test results show that the components based on NdFeO3 have better Response with up to 187 ppm for 1000 ppm (10-6) alcohol and up to 1000 ppm based on GdFeO3 for acetone, acetic acid and formaldehyde at 260 ° C with a sensitivity of 67.1 to 1000 ppm formaldehyde at 315 ° C When 1000ppm alcohol and acetaldehyde have a strong response, of which the sensitivity of alcohol up to 90.8.