Heterostructures of hollow Co3O4 nanocages wrapped in NiO cilia for conductometric NO2 sensing at room temperature
SENSORS AND ACTUATORS B-CHEMICAL(2024)
摘要
Metal organic frameworks (MOFs) have drawn the spotlight in the field of gas sensing due to their miraculous geometrical and electronic structures, as well as simple and controllable self -assembly processes. Here, NiO@Co3O4 heterostructures to be synthesized using heating reflux method by vertically wrapping ultra -thin NiO cilia on the surface of hollow ZIF-67 nanocages and applying this as a template for thermal annealing. The unique hollow structure and rich mesoporous structure provide space for gas diffusion and carrier migration. The prepared NiO@Co3O4-350 sensor achieves a high response of 47.4 and exceedingly short response/recovery time (1.3 and 9.6 s) at room temperature, with a minimum detection limit of only 10 ppb and good selectivity, repeatability and long-term stability for NO2 gas. This work highlights the significance of morphology and structure for improving gas sensing performance, which sheds a thought -provoking light on the design and preparation of composite oxide sensors.
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关键词
MOF,NiO cilia,Hollow Co 3 O 4 nanocage,Heterostructure,NO 2 gas sensing
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