Study of Optical properties of Poly (O- Toluidine)-MWCNT Films Prepared via the Spin Coating Method

This study aimed to investigate the structural, optical, and electrical properties of poly (O-Toluidine)-MWCNT films. The spin-coating method was used to deposit the solution on glass substrates, and different ratios of poly (O-Toluidine)- to MWCNT were used, specifically 99:1, 98:2, 97:3, 96:4 and 95:5. Characterization techniques including X-ray diffraction (XRD) and UV-Visible spectrophotometer were used to analyze the crystalline nature and optical properties of the deposited films. The XRD results revealed an amorphous structure for all the samples. The optical properties of poly (O-Toluidine)-MWCNT films varied with wavelength and doping ratio. It was observed that as the wavelength decreased in the high-energy region, absorbance increased and reflectivity decreased. Conversely, as the doping ratio increased, transmittance decreased. The absorption coefficient and extinction coefficient also varied with wavelength, both decreasing as the wavelength decreased. The refractive index exhibited a decrease as the wavelength increased. Furthermore, the optical conductivity increased with both the energy of the incident photon and the increase of MWCNT concentrations. Also, the optical energy gap values for poly (O-Toluidine) films decrease with the increasing ratio of doping concentrations.