Determination of optical properties of carbon nanotubes doped with aluminum oxide nanomaterial's in different molars using Ultraviolet- visible spectroscopy, X-ray diffraction and Infrared techniques

The aim for this study is the determination of the optical properties of carbon nanotubes doped with aluminum oxide nanomaterial in different molars (0.1, 0.3, 0.5, 0.7, and 0.9, used for these optical properties: ultraviolet, X-ray diffraction, and infrared techniques. The following were the study's findings: the optical properties of the ultraviolet technique of carbon doped by aluminum oxide samples, the quick rise of the absorption by wavelengths of 235 nm corresponding the photon-energy of 5.277 eV by doped increases, also show that absorbance value increase by doped increase. The samples of carbon doped with aluminum oxide have an absorption coefficient of 0.9 molar, which is equivalent to 4.99×10 ⁴ cm ^− 1 in the UV region (235 nm), but for the 0.1 molar sample, it equals 2.41×10 ⁴ cm ^− 1 at the same wavelength, increasing while doped increased. For refractive index spectra of prepared samples by carbon doped by aluminum oxide, the maximum value is (2.134) for the 0.9 molar at wavelength 300 nm, but for the 0.1 molar samples, it equals 1.031 at the same wavelength. The amplitude of the energy gap was reduced among 3.505–3.376 eV of carbon doped with Aluminum oxide. As a result of X-ray diffraction, the crystallites with carbon doped by aluminum oxide are (hexagonal-primitive), showing that increasing the density of the sample by increasing the molar of aluminum oxide samples by a rate (0.8572 mg.cm ^− 3 /mole). Finally, it describes the relation between the rates of aluminum oxide concentration and d-spacing of carbon-doped aluminum oxide samples, the rate of decreasing the spacing between dots of the carbon doped Aluminum oxide by increasing molar concentration is 0.28085×10 ¹⁰ m/molar. Results of FT-IR the spectra of all the ferrites have been used to locate the places of the bands. The current investigation, the peak absorption of bands ν1, ν2, ν3, ν4, and ν5 are around 460 cm ^− 1 , 750 cm ^− 1 ,852 cm ^− 1 ,3626 cm ^− 1 , and 3900 cm ^− 1 , accordingly for each composition.