Abstract Lanthanum-doped copper-cadmium ferrite (La-CCF) nanocrystallite pallet sensors are synthesized using a sol-gel auto-combustion method and envisaged in ammonia gas sensing applications. The structure and morphology measurements of the La-CCF sensors are investigated by X-ray diffraction (XRD) pattern and scanning electron microscopy images. The single tetragonal spinel phase is confirmed from X-ray diffraction analysis. A secondary phase of LaO3 is observed when La doping level is ≥ 0.1 observed. The surface appearance of the La-CCF sensor changes from irregular polished course to irregular elevation type crystallites on La addition. The room-temperature gas sensing measurements suggest a better selectivity and sensitivity of La-CCF sensors for ammonia gas among several tested target gases. The sensing performance increases with La3+-doping level from x = 0.0 to 0.1 due to lattice defect introduced by a large sized La ion substitution.

中文翻译：

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调整La3+掺杂铜镉铁氧体纳米结构的氨气传感性能

摘要 镧掺杂的铜镉铁氧体 (La-CCF) 纳米微晶托盘传感器是使用溶胶-凝胶自燃方法合成的，并设想用于氨气传感应用。La-CCF 传感器的结构和形态测量通过 X 射线衍射 (XRD) 图案和扫描电子显微镜图像进行研究。X 射线衍射分析证实了单一的四方尖晶石相。当观察到 La 掺杂水平 ≥ 0.1 时，观察到 LaO3 的第二相。La-CCF 传感器的表面外观在添加 La 后从不规则的抛光过程变为不规则的高程型微晶。室温气体传感测量表明，La-CCF 传感器在几种测试目标气体中对氨气具有更好的选择性和灵敏度。