Facile synthesis and optical characterization of graphene oxidedoped TiO2/polyvinyl alcohol nanocomposites: optical limiting applications
M.I.Mohammed;
Abstract
In this present research, PVA polymer was utilized as a host polymer to fabricate free-standing
PVA/TiO2:GOnanocomposites 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
XRDpatterns. 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:GOnanocomposites 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=3×108msec−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 40ml GO, respectively. The evaluated
Attenuation power of the fabricated free-standing PVA/TiO2:GOsamples elucidated that the optical
limiting results studies showed that it may be suitable to attenuate the laser power by utilizing the
fabricated PVA/TiO2: GOfilms.
PVA/TiO2:GOnanocomposites 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
XRDpatterns. 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:GOnanocomposites 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=3×108msec−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 40ml GO, respectively. The evaluated
Attenuation power of the fabricated free-standing PVA/TiO2:GOsamples elucidated that the optical
limiting results studies showed that it may be suitable to attenuate the laser power by utilizing the
fabricated PVA/TiO2: GOfilms.
Other data
Title | Facile synthesis and optical characterization of graphene oxidedoped TiO2/polyvinyl alcohol nanocomposites: optical limiting applications | Authors | M.I.Mohammed | Keywords | PVA/TiO2: GO;polymeric nanocomposites;optical properties;laser power attenuator | Issue Date | 2019 | Publisher | IOP publisher | Journal | Mater. Res. Express | Volume | 6 | Issue | 075054 |
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