Abstract Manganese ferrites (MnFe2O4) and three different weight percentage of nickel doped manganese ferrites (Ni: MnFe2O4) was prepared through a chemical co-precipitation method. The crystal structure, crystallite size, and phase of the prepared materials are determined by X-Ray Diffraction technique (XRD). The average crystallite size was calculated to be 44 nm, 42 nm, 37 nm, and 35 nm for MnFe2O4, Ni1%Mn(x-1%) Fe2O4, Ni3%Mn(x-3%)Fe2O4, and Ni5%Mn(x-5%)Fe2O4, respectively. Fourier Transforms Infrared (FTIR) spectroscopy technique is used to study the functional groups present in the prepared materials. Surface morphology and elemental compositions of the synthesized nanoparticles were examined using Scanning Electron Microscope (SEM) and Energy Dispersive X-ray spectroscopy (EDAX). The gas sensing property of the prepared materials was studied with different ppm of ammonia gas (NH3), and the respective response and recovery time was calculated.

中文翻译：

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用于氨气传感器应用的 MnFe2O4 和 Ni：MnFe2O4 纳米颗粒的制备

摘要 采用化学共沉淀法制备了锰铁氧体（MnFe2O4）和三种不同重量百分比的掺镍锰铁氧体（Ni：MnFe2O4）。所制备材料的晶体结构、微晶尺寸和相是通过 X 射线衍射技术 (XRD) 确定的。对于 MnFe2O4、Ni1%Mn(x-1%) Fe2O4、Ni3%Mn(x-3%)Fe2O4 和 Ni5%Mn( x-5%)Fe2O4。傅里叶变换红外 (FTIR) 光谱技术用于研究制备的材料中存在的官能团。使用扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDAX) 检查合成纳米粒子的表面形态和元素组成。