Study on optical energy band gap of SrBi 2 Ta 2 O 9 thin films annealed in a H 2 -contained ambient

2010 ◽  
Author(s):  
Dong-sheng Wang ◽  
Tao Yu ◽  
Di Wu ◽  
Ai-dong Li ◽  
An Hu ◽  
...  
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Energy Band ◽  
Energy Band Gap ◽  
Optical Energy ◽  
Optical Energy Band Gap

Investigation of optical energy band gap of transition metal oxide/polystyrene nanocomposite foils

2021 ◽  
Author(s):  
Monika Barala ◽  
Bulkesh Siwach ◽  
Reetu Sangwan ◽  
Kavita Yadav ◽  
Devendra Mohan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Band Gap ◽  
Energy Band ◽  
Transition Metal Oxide ◽  
Energy Band Gap ◽  
Optical Energy ◽  
Optical Energy Band Gap

The Role of Samarium Ion in Optical Properties of Magnesium Tellurite Glass Embedded with Silver Nanoparticles

2015 ◽  
Vol 1107 ◽  
pp. 460-465
Author(s):  
M.Y. Nurulhuda ◽  
M.R. Sahar
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Tellurite Glass ◽  
Urbach Energy ◽  
Energy Band Gap ◽  
Optical Energy ◽  
Optical Energy Band Gap ◽  
Absorption Studies ◽  
Uv Visible

A series of tellurite glass based on composition (89.6-x)TeO2-10MgO-xSm2O3-0.4AgCl where 0.2x1.0 have successfully been prepared by melt-quenching technique. The optical behaviour has been examined as a function of Sm2O3 content by using UV-Visible Spectroscopy in the range of 200-900 nm. The absorption studies revealed that the indirect and direct optical energy band gap is in the range of 2.81-3.11 eV and 3.16-3.45 eV, respectively. Meanwhile, Urbach energy, E is in between 0.18-0.24 eV. The increasing in samarium ion up to 0.4 mol% of Sm2O3 result in an increment of optical energy band gap, but gradually decreases beyond 0.4 mol%. All the results will be discussed with respect to Sm2O3 content.

Optical energy band gap of PAAm-GO composites

2018 ◽  
Vol 183 ◽  
pp. 212-215 ◽  
Author(s):  
Gülşen Akın Evingür ◽  
Önder Pekcan
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Energy Band Gap ◽  
Optical Energy ◽  
Optical Energy Band Gap

Temperature dependence of the optical energy band gap in CuIn3Se5 and CuGa3Se5

2003 ◽  
Vol 93 (1) ◽  
pp. 780-782 ◽  
Author(s):  
C. Rincón ◽  
S. M. Wasim ◽  
G. Marı́n ◽  
I. Molina
Keyword(s):  
Temperature Dependence ◽  
Band Gap ◽  
Energy Band ◽  
Energy Band Gap ◽  
Optical Energy ◽  
Optical Energy Band Gap

Modulation of Energy Band Gap of ZnO Thin Films Grown by Pulsed Laser Deposition

2003 ◽  
Vol 764 ◽  
Author(s):  
Sang Yeol Lee ◽  
Yuan Li ◽  
Jang-Sik Lee ◽  
J. K. Lee ◽  
M. Nastasi ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Band Gap ◽  
Energy Band ◽  
Pulsed Laser ◽  
Processing Parameters ◽  
Laser Deposition ◽  
Energy Band Gap ◽  
Sapphire Substrates ◽  
Optical Energy Band Gap

AbstractZnCdO thin films were deposited on (001) sapphire substrates by pulsed laser deposition. Modulation of the energy band gap of ZnCdO was induced by changing the processing parameters. The optical energy band gap of ZnCdO thin films, measured by photoluminescence and transmittance, changed from 3.289 eV to 3.311 eV due to the variation of annealing temperatures. The change of the optical properties was attributed to the change of the stoichiometry of ZnxCd1-xO as illustrated by Rutherford backscattering spectroscopy.

Optical Properties Of Tantalum Oxide Films Deposited On BK7 Substrates By Excimer Laser Ablation

2000 ◽  
Vol 617 ◽  
Author(s):  
S. Boughaba ◽  
M. U. Islam
Keyword(s):  
Optical Properties ◽  
Laser Ablation ◽  
Band Gap ◽  
Energy Band ◽  
Tantalum Oxide ◽  
Energy Band Gap ◽  
Optical Energy ◽  
Extinction Coefficients ◽  
Glass Substrates ◽  
Optical Energy Band Gap

AbstractThin amorphous films of tantalum oxide were grown on borosilicate crown glass substrates by KrF excimer pulsed laser ablation of a Ta2O5 target, in an oxygen environment. The deposition was performed at a temperature of 250 or 400 °C, while the oxygen pressure was set in the range 5 to 30 mTorr. The optical properties of the tantalum oxide coatings, as evaluated by reflectance/transmittance spectrophotometry, were found to be dependent on the oxygen gas pressure. At a pressure of 5 mTorr, absorbing films were obtained, with extinction coefficients above 10−2 (at λ=633 nm), along with an optical energy band-gap as low as 0.7 eV. At a pressure of 10 mTorr and above, the coatings had refractive indices up to 2.25 (at λ=633 nm), extinction coefficients below 10−4 (for λ>390 nm), and an optical energy band-gap in the range 3.9 to 4.0 eV.

scholarly journals Effect of Co3O4 doping and sintering temperature on optical energy band gap properties in Zn-Bi-Ti-O varistor ceramics

2017 ◽  
Author(s):  
Mohd Sabri Mohd Ghazali ◽  
Wan Rafizah Wan Abdullah ◽  
Azmi Zakaria ◽  
Muhamad Azman Zulkifli ◽  
Mohd Hafiz Mohd Zaid ◽  
...  
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Sintering Temperature ◽  
Energy Band Gap ◽  
Optical Energy ◽  
Optical Energy Band Gap

scholarly journals Characterization of silver polyaniline nanocomposite thin films prepared by microwave induced plasma

2019 ◽  
Vol 13 (28) ◽  
pp. 1-9
Author(s):  
Ahmad S. Wassfi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Ag Nanoparticles ◽  
Energy Band ◽  
Average Particle ◽  
Energy Band Gap ◽  
Optical Energy ◽  
Microwave Induced Plasma ◽  
Nanocomposite Thin Films

Polyaniline (PANI) and Ag/PANI nanocomposite thin films have prepared by microwave induced plasma. The Ag powder of average particle size of 50 nm, were used to prepare Ag/PANI nanocomposite thin films. The Ag/PANI nanocomposite thin films prepared by polymerization in plasma and characterized by UV-VIS, FTIR, AFM and SEM to study the effect of silver nanoparticles on the optical properties, morphology and structure of the thin films. The optical properties studies showed that the energy band gap of the Ag/PANI (5%wt silver) decreased from 3.6 to 3.2 eV, where the substrate location varied from 4.4 to 3.4 cm from the axis of the cylindrical plasma chamber. Also the optical energy gap decreased systematically from 3.3 to 3 eV with increasing Ag nanoparticles, where Ag concentration increased from 5% to 11%wt. The FTIR measurement showed a shifting in the FTIR absorption peaks with Ag concentration. AFM and SEM images indicate that there are a few clusters of Ag and there is a uniform distribution of the Ag nanoparticles in the PANI matrix. It can be concluded that Ag/PANI nanocomposite thin films with controlled optical energy band gap can be prepared by microwave induced plasma technique.

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