Optical properties of neodymmium and erbium doped tellurite glass coated with graphene oxide
<p>This study aimed to enhance the optical properties on neodymium oxide (Nd2O3) and</p><p>erbium oxide (Er2O3) doped tellurite-based glass coated with graphene oxide (GO). The two series of</p><p>tellurite glasses with chemical c...
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| Format: | thesis |
| Language: | eng |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://ir.upsi.edu.my/detailsg.php?det=7232 |
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| Summary: | <p>This study aimed to enhance the optical properties on neodymium oxide (Nd2O3) and</p><p>erbium oxide (Er2O3) doped tellurite-based glass coated with graphene oxide (GO). The two series of</p><p>tellurite glasses with chemical composition of {[(TeO2)0.7 (B2O3)0.3]0.7 (ZnO)0.3}1?y (Nd2O3)y and</p><p>{[(TeO2)0.7 (B2O3)0.3]0.7 (ZnO)0.3}1?y (Er2O3)y with varying</p><p>concentrations of Nd+ and Er+ ions from y=0.005, 0.01, 0.02, 0.03, 0.04, and 0.05 mol% were</p><p>prepared and coated with GO using melt-quenching and spray coating methods. The physical,</p><p>structural and optical properties of prepared glasses were characterized using densimeter, scanning</p><p>electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR),</p><p>Ellipsometer, and ultraviolet- visible (UV- Vis) spectrophotometer. The structural analysis</p><p>determined by XRD pattern proved an amorphous structure for the glass samples. The obtained results</p><p>through FT-IR analysis showed the formation of non-bridging oxygens (NBOs) in the glass network</p><p>system. The SEM images revealed the surface morphology of GO on the glass surface. The values of</p><p>the refractive index were escalated with the increasing concentration of neodymium from</p><p>2.301 to 2.332, and erbium from 2.275 to 2.299 with the existence of GO. This was due to the</p><p>presence of a high degree number of oxygen atoms consisted in GO structure. The values of optical</p><p>bandgap energy were enhanced with the increasing concentrations of neodymium from 3.315 to 3.381 eV</p><p>while for erbium from 3.392 to 3.495 eV. The increment of optical bandgap energy was due to the</p><p>high in GO optical absorptions. The electronic polarizability values of glass samples were enhanced</p><p>for neodymium from 8.815 to 8.887 while for erbium from 8.815 to 8.894 due to high surface</p><p>area and low particle density in GO. In conclusion, the synthesized GO is a good candidate for use</p><p>as a coating material on tellurite-based glass surfaces. This study may contribute to the</p><p>potential uses for high optical performance of fiber optics applications.</p><p></p> |
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