Metal

Catalysis

Adsorption

Butanol

Engineering

Nanoparticle

Metallurgy

Materials science

Gaseous diffusion

Fuel cells

Chemical engineering

Porosity

Thermodynamics

Physics

Nanotechnology

Organic chemistry

Diffusion

Template

Metal-organic framework

Porous medium

Composite material

Chemistry

n-Butanol

Ethanol

Specific surface area

Journal of Hazardous Materials

Porous metal oxides are promising materials for VOCs (volatile organic compounds) chemical sensors, because they have large specific surface areas and enough internal space for the fast gas diffusion. Recently, metal-organic framework (MOF) materials with varied shapes and sizes have been regarded as good templates for preparing porous metal oxides. Herein, four kinds of Co-MOFs were prepared by altering the ratios of Co2+ ions and 2-methylimidazole at room temperature, which exhibited well-controlled shapes. Then, corresponding porous Co3O4 assembled from nanoparticles was acquired by heating Co-MOFs, and showed a good sensing performance for n-butanol, with a response up to 21.0 toward 100 ppm n-butanol. Moreover, it is found that the shape and the size of Co3O4 assemblies can significantly influence their sensing performances. For porous Co3O4 assemblies, when the nanoparticles are small enough (˜10 nm), a porous structure with a larger proportion of the nanoparticles close to its surface tends to show a better gas-sensing performance. The findings can be used in the design of gas-sensing materials in the future.

Rational shape control of porous Co3O4 assemblies derived from MOF and their structural effects on n-butanol sensing