Synthesis of MgO Nanoparticles via Sol-Gel Method

摘要

Ultra-pure and colloidal MgO nanopowders were synthesized with well-defined morphology at room temperature by using Magnesium acetate tetra hydrate and potassium hydroxide in a stoichiometric ratio via Sol-gel method. MgO nano powder were characterized with the help of TEM, FT-IR, UV-Visible and TGA-DTA techniques after calcination at 1000 ℃ in the presence of dry air. X-ray diffraction studies revealed that calcined powders have good crystallinity with average particle size in the range of 50 nm to 60 nm having narrow particle size distribution with cubic structure. From FTIR studies, the peaks related to the formation of asymmetric and symmetric vibration frequencies of Mg and O bond were observed, whereas UV-Vis spectroscopic observation indicates the presence of broad prominent excitonic absorption band at 250-290 nm which take place due to the scattering quantum size effect and Urpach effect. The thermal analysis supports the removal of surface impurities leads to phase transition with the formation of cubic MgO. XRD and electron microscopy were used to characterize the phase and size as well as shape of MgO nanopowder. The surface area was estimated by using BET technique. It was observed that the surface area was calculated as ～ 25.3 m~2/g and the single point total volume is P/P_0 = 0.17 cm~3/gm, indicating that the prepared powder can be used for wide applications where higher surface area is required.