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%.