Metal-Organic Framework-Derived Hollow Hierarchical Co3 O4 Nanocages with Tunable Size and Morphology: Ultrasensitive and Highly Selective Detection of Methylbenzenes

ACS Applied Materials & Interfaces
Young-Moo JoJong-Heun Lee

Abstract

Nearly monodisperse hollow hierarchical Co3O4 nanocages of four different sizes (∼0.3, 1.0, 2.0, and 4.0 μm) consisting of nanosheets were prepared by controlled precipitation of zeolitic imidazolate framework-67 (ZIF-67) rhombic dodecahedra, followed by solvothermal synthesis of Co3O4 nanocages using ZIF-67 self-sacrificial templates, and subsequent heat treatment for the development of high-performance methylbenzene sensors. The sensor based on hollow hierarchical Co3O4 nanocages with the size of ∼1.0 μm exhibited not only ultrahigh responses (resistance ratios) to 5 ppm p-xylene (78.6) and toluene (43.8) but also a remarkably high selectivity to methylbenzene over the interference of ubiquitous ethanol at 225 °C. The unprecedented and high response and selectivity to methylbenzenes are attributed to the highly gas-accessible hollow hierarchical morphology with thin shells, abundant mesopores, and high surface area per unit volume as well as the high catalytic activity of Co3O4. Moreover, the size, shell thickness, mesopores, and hollow/hierarchical morphology of the nanocages, the key parameters determining the gas response and selectivity, could be well-controlled by tuning the precipitation of ZIF-67 rhombic dodecahedra an...Continue Reading

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Citations

May 6, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Zongtang LiHelin Niu
Apr 2, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Huaping WangJie Huang
Nov 12, 2019·ACS Applied Materials & Interfaces·Kechuang WanJunhe Yang
Feb 23, 2020·ACS Sensors·Hui ZhiLiang Feng

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