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采用硬脂酸凝胶法化学工艺在较低温度下合成CdFe2 O4纳米晶材料。TG DTA热分析表明 :纳米晶CdFe2 O4在 410℃左右晶化形成 ;XRD、BET比表面吸附等技术表征结果表明 ,所合成纳米晶CdFe2 O4属立方尖晶石结构 ,平均晶粒度为15～ 2 3nm ,Cd2 + 适度过量对CdFe2 O4晶粒生长具有抑制作用。湿敏特性测试结果表明 ,纳米晶CdFe2 O4湿敏元件感湿灵敏度优于相应的常规陶瓷元件 ,Cd2 + 适度过量 (Cd2 + /Fe3 + >1/2 ) ,可达到调制纳米晶湿敏电阻值范围及减小材料湿滞的双重目的。初步探讨了过量Cd2 + 影响CdFe2 O4纳米晶材料湿敏性能的内在原因。
Stearic acid gel chemistry was used to synthesize CdFe2O4 nanocrystalline materials at lower temperature. The results of TG DTA analysis show that the nanocrystalline CdFe2 O4 is crystallized at about 410 ℃. The XRD and BET specific surface adsorption results indicate that the nanocrystalline CdFe2 O4 is a cubic spinel with an average grain size of 15 ~ 2 3nm, Cd2 + Moderate Excess CdF 2 O 4 grain growth has an inhibitory effect. The results of the test of the humidity sensitivity show that the sensitivity of the nanocrystalline CdFe2 O4 sensor is better than that of the conventional ceramic component, and the Cd2 + is moderate excess (Cd2 + / Fe3 +> 1/2) Range and reduce the material wet stagnant dual purpose. The intrinsic causes of Cd (superscript 2 +) affecting the humidity sensitivity of CdFe 2 O 4 nanocrystalline materials were preliminarily discussed.