Transformation of CuO from Cu‐ MOF Templates and Their Enhanced Sensing Performance for HCHO

In this study, porous CuO samples were prepared from Cu‐Metal‐organic frameworks (MOF) templates through thermal decomposition. Four types of porous CuO samples were prepared through different decomposition treatments at temperatures ranging from 400 to 800 °C. The prepared CuO samples were characterized by scanning electron microscopy, transmission electron microscopy, and X‐ray powder diffraction. The CuO prepared at a calcination temperature of 500 °C (CuO‐500), showed outstanding sensing performance in terms of response and response/recovery speed. The micropores in the material provided numerous active sites whereas the mesopores functioned as passages for the HCHO gas molecules. Furthermore, CuO‐500 shows an excellent selectivity to HCHO gas.