Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 10, Pages 8860-8868Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00733
Keywords
gas sensor; hollow hierarchical nanocages; zeolitic imidazolate framework; methylbenzene; Co3O4
Funding
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Education, Science, and Technology (MEST)) [2016R1A2A1A05005331]
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Nearly monodisperse hollow hierarchical Co3O4 nanocages of four different sizes (similar to 0.3, 1.0, 2.0, and 4.0 mu m) 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 similar to 1.0 mu m 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 degrees 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 and solvothermal reaction. This method can pave a new pathway for the design of high-performance methylbenzene sensors for monitoring the quality of indoor air.
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