Structural, thermal and optical properties of nickel nanomaterial synthesized by the open-air heat treatment method

Abstract

In this present research, as a result of heat treatment in the open using a furnace at a temperature of 500 °C, the nickel-coated carbon fibers in this work were successfully created with the nanocrystalline NiO monolayer. The thermal and optical properties (PL) of these materials were investigated using their structural, morphological, compositional, X-ray diffraction (XRD), differential scanning calorimetry (DSC), ultraviolet–visible analysis (UV–Vis), and photoluminescence spectroscopy, as well as scanning electron microscopy (SEM) with the option of chemical analysis (EDS). According to the XRD model, the structure of the produced NiO nanoparticles is the face-centered cubic (fcc) phase. In addition, the DSC shows that the produced nanoparticles form a NiO phase at 360 °C with good thermal stability, and from the optical absorption spectra of the NiO nanoparticles, it is possible to infer that the band gap is 3.5 eV, which is close to the values used as references, also, the significant absorption edges at 287 nm (4.32 ev), 327 nm (3.79 ev), 346 nm (3.58 ev), 397 nm (3.12 ev), and 430 nm (2.88 ev) are seen in the photoluminescence (PL) spectrum, as well, in the violet emission band, the strongest peak has a wavelength of 397 nm and an excitation wavelength of 470 nm (2.64 eV).