• 文献标题:   Facile synthesis and optical characterization of graphene oxide-doped TiO2/polyvinyl alcohol nanocomposites: optical limiting applications
  • 文献类型:   Article
  • 作  者:   NAWAR AM, MOHAMMED MI, YAHIA IS
  • 作者关键词:   pva/tio2:go, polymeric nanocomposite, optical properties laser power attenuator
  • 出版物名称:   MATERIALS RESEARCH EXPRESS
  • ISSN:   2053-1591
  • 通讯作者地址:   Suez Canal Univ
  • 被引频次:   3
  • DOI:   10.1088/2053-1591/ab180a
  • 出版年:   2019

▎ 摘  要

In this present research, PVA polymer was utilized as a host polymer to fabricate free-standing PVA/TiO2:GO nanocomposites films. The fabricated films were subjected to different structural inspections; at first the surface topography was examined by scan electron microscopy, SEM. The analyzed PVA/TiO2 doped 30 ml graphene oxide film revealed in most a smoothed surface without any microcracks or physical and/or chemical treatment (as a representative sample). Secondly, The crystal structure of the fabricated samples (PVA/TiO2:dopedGO) was analyzed through its recorded XRD patterns. At normal incidence, spectrophotometric properties such as: transmittance, Reflectance and absorbance, Abs were characterized to estimate the Optical constants such as refractive index (n) and extinction coefficient (k) for the fabricated samples. The linear and nonlinear propagation of probe normal light beam in PVA/TiO2:GO nanocomposites were inspected and elucidated in wavelength from 250 to 2500 nm. The estimated values of the oscillator energy and strength are increased with the doping ratio from 0 to 40 ml. The calculated value of the group velocity is less (c = 3 x 10(8) m sec(-1)) and decreases with increasing of the GO-doping ratio. The extracted value of static refractive index and direct energy gap was found to be decreased from 5.42 to 1.22 and from 2.12 to 1.49 as GO-doping ratio was increased from 0 to 40 ml GO, respectively. The evaluated Attenuation power of the fabricated free-standing PVA/TiO2:GO samples elucidated that the optical limiting results studies showed that it may be suitable to attenuate the laser power by utilizing the fabricated PVA/TiO2:GO films.