The effect of laser energy on the properties of carbon nanotube—iron oxide nanoparticles composite prepared via pulsed laser ablation in liquid

Abstract

A composite of Carbon Nanotubes (CNTs)-iron oxide (IO) Nanoparticles have been produced successfully by two-step pulsed laser ablation in liquid process. The vibration bond, structural, morphology, chemical composition, and optical properties were investigated using Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD), Transmission electron microscopy (TEM), energy Dispersive spectrum (EDS), UV–vis spectrophotometer and PL Spectrofluorometer. The result of FTIR spectra exhibit the presence of C≡C bond at 2150 cm−1, and another bond at 1724 cm−1 related to CNT—IO attachment. The XRD pattern observed the presence of carbon phase at 2θ ≈ 26.6° and 43°, and different phases of IO NPs at 2θ ≈ 24.14°, 35.7°, 43.88°, 63° and 76°. EDS showed the presence of C, O, and Fe element in the nanocomposites. The TEM images exhibited the synthesized carbon nanotubes with diameters about (6–7) nm and (3–4) nm spherical iron oxide Nanoparticles, which aggregated helically around the carbon nanotubes. The absorption spectrum exhibited a shoulder peak between 260 and 320 nm, which correspond to π → π* transition of the C=O band, and π → π* electronic transition in a C=C band. Also found that the absorption spectra of the CNTs can be shifted to red by increasing the concentration of IO Nanoparticles from 20% to 43%. While the PL spectra have intensity at 597 nm decreased slightly when increasing the doping ratio of iron oxide Nanoparticles from 20% to 43%.