Real-time detection of acetone vapor at low concentration plays a decisive role in early noninvasive diagnosis of diabetes. In this work, porous NiFe₂O₄ crystalline nanocubes have been scalably prepared via an as-developed cost-efficient and facile strategy, which involves a morphology-inherited annealing treatment of single-resource Prussian Blue analogue of Ni₃[Fe(CN)₆]₂·xH₂O solid nanocubes as self-sacrificial templates. The porous NiFe₂O₄ crystalline nanocubes are demonstrated to be composed of primary nano building blocks and interconnected pores. When utilized as sensing materials, the as-synthesized NiFe₂O₄ exhibited p-type gas-sensing behavior that the resistance increases in a reducing gas atmosphere. Furthermore, the as-fabricated NiFe₂O₄ sensor was sensitive and selective to acetone gas with an obvious response value of 1.9 at its low concentration (1 ppm) and low detection of limit (0.52 ppm) at a quite low working temperature (160 °C). In addition, the sensing mechanism is deeply investigated. More significantly, our prominent findings herein shed light on the fabrication of metal oxide based gas sensors in environmental and medicinal fields.

低浓度丙酮蒸气的实时检测在糖尿病的早期无创诊断中起着决定性的作用。在这项工作中，多孔的NiFe ₂ O ₄晶体纳米立方体已经通过开发的具有成本效益和简便的策略规模化制备，该策略涉及一种形态学上归纳的Ni ₃ [Fe（CN）单源普鲁士蓝类似物的退火处理。₆ ] ₂ · x H ₂ O固体纳米立方体作为自我牺牲模板。多孔NiFe ₂ O ₄晶体纳米立方体被证明是由主要的纳米结构单元和相互连接的孔组成。当用作感测材料时，合成后的NiFe ₂ O ₄表现出p型气体感测行为，即在还原性气体气氛中电阻增加。此外，组装后的NiFe ₂ O ₄传感器对丙酮气体敏感且具有选择性，在低浓度（1 ppm）时响应值为1.9，而在很低的工作温度（160）时极限的检测值较低（0.52 ppm）。 °C）。此外，对传感机制进行了深入研究。更重要的是，我们在本文中的突出发现揭示了在环境和医学领域中基于金属氧化物的气体传感器的制造。