Facile Synthesis of Polycrystalline NiO Nanorods Assisted by Microwave Heating

Polycrystalline NiO nanorods have been synthesized by thermal decomposition of rod‐like nickel oxide precursor achieved by microwave‐assisted method. The structure, morphology, and crystalline phase of the products are characterized by transmission electron microscopy (TEM), X‐ray diffractometry, Fourier‐transformed infrared spectroscopy, and UV‐visible absorption spectrum. TEM reveals that NiO nanorods consist of numerous NiO nanoparticles. The average size of NiO nanoparticles as a function of the calcination temperature has been investigated. The optical absorption band gap of polycrystalline NiO nanorods is 3.7 eV.