Abstract: Hierarchical CuO nanosheets were successfully synthesized by liquid phase synthesis method with the pH near neutral(7.5) and temperature close to room temperature(30 ℃).SEM and TEM resutls showed that the as-synthesized CuO nanosheets were composed of numerous tiny nanoparticles.The growth mechanism of CuO nanosheets can be explained by SEM detection in synthesis.The spectral Analysis of UV-vis was used to estimate the band gap of the nanosheets,and the band gap was calcutaled to be about 1.94 eV.This struc...