MOFs structure possesses low density, ultra-high porosities, and high specific surface areas. Attributed to these advantages, MOSs derived from MOFs are investigated in excellent applications, such as lithium-ion batteries, electrochemical sensing, supercapacitors, solar cells, and so on. Because of this interest, it is important to evaluate potential application in environmental or human exposure. The cover graphic depicts a series of ZIF-67-derived Co₃O₄ molecules with discrepant appearance that might be useful as platform materials for acetone sensing.