scholarly journals Pressure dependence of refractive index of Ge near the absorption edge

2016 ◽  
Vol 65 (16) ◽  
pp. 167801
Author(s):  
Shi Wen-Jun ◽  
Yi Ying-Yan ◽  
Li Min
Keyword(s):  
Refractive Index ◽  
Absorption Edge ◽  
Pressure Dependence

scholarly journals Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1570
Author(s):  
Shujahadeen B. Aziz ◽  
Elham M. A. Dannoun ◽  
Dana A. Tahir ◽  
Sarkawt A. Hussen ◽  
Rebar T. Abdulwahid ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Absorption Edge ◽  
Ceo2 Nanoparticles ◽  
Poly Vinyl Alcohol ◽  
Optical Parameters ◽  
Single Oscillator Model ◽  
Vis Spectroscopy ◽  
The Impact ◽  
Host Polymer

In the current study, polymer nanocomposites (NCPs) based on poly (vinyl alcohol) (PVA) with altered refractive index and absorption edge were synthesized by means of a solution cast technique. The characterization techniques of UV–Vis spectroscopy and XRD were used to inspect the structural and optical properties of the prepared films. The XRD patterns of the doped samples have shown clear amendments in the structural properties of the PVA host polymer. Various optical parameters were studied to get more insights about the influence of CeO2 on optical properties of PVA. On the insertion of CeO2 nanoparticles (NPs) into the PVA matrix, the absorption edge was found to move to reduced photon energy sides. It was concluded that the CeO2 nanoparticles can be used to tune the refractive index (n) of the host polymer, and it reached up to 1.93 for 7 wt.% of CeO2 content. A detailed study of the bandgap (BG) was conducted using two approaches. The outcomes have confirmed the impact of the nanofiller on the BG reduction of the host polymer. The results of the optical BG study highlighted that it is crucial to address the ɛ” parameter during the BG analysis, and it is considered as a useful tool to specify the type of electronic transitions. Finally, the dispersion region of n is conferred in terms of the Wemple–DiDomenico single oscillator model.

scholarly journals Polymer Composites with 0.98 Transparencies and Small Optical Energy Band Gap Using a Promising Green Methodology: Structural and Optical Properties

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1648
Author(s):  
Muaffaq M. Nofal ◽  
Shujahadeen B. Aziz ◽  
Jihad M. Hadi ◽  
Wrya O. Karim ◽  
Elham M. A. Dannoun ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Polymer Composites ◽  
Amorphous Phase ◽  
Absorption Edge ◽  
Complex Form ◽  
Bandgap Energy ◽  
Optical Parameters ◽  
Visible Spectroscopy ◽  
Uv Visible

In this work, a green approach was implemented to prepare polymer composites using polyvinyl alcohol polymer and the extract of black tea leaves (polyphenols) in a complex form with Co2+ ions. A range of techniques was used to characterize the Co2+ complex and polymer composite, such as Ultraviolet–visible (UV-Visible) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The optical parameters of absorption edge, refractive index (n), dielectric properties including real and imaginary parts (εr, and εi) were also investigated. The FRIR and XRD spectra were used to examine the compatibility between the PVA polymer and Co2+-polyphenol complex. The extent of interaction was evidenced from the shifts and change in the intensity of the peaks. The relatively wide amorphous phase in PVA polymer increased upon insertion of the Co2+-polyphenol complex. The amorphous character of the Co2+ complex was emphasized with the appearance of a hump in the XRD pattern. From UV-Visible spectroscopy, the optical properties, such as absorption edge, refractive index (n), (εr), (εi), and bandgap energy (Eg) of parent PVA and composite films were specified. The Eg of PVA was lowered from 5.8 to 1.82 eV upon addition of 45 mL of Co2+-polyphenol complex. The N/m* was calculated from the optical dielectric function. Ultimately, various types of electronic transitions within the polymer composites were specified using Tauc’s method. The direct bandgap (DBG) treatment of polymer composites with a developed amorphous phase is fundamental for commercialization in optoelectronic devices.

Pressure dependence of the optical-absorption edge of diamond

1991 ◽  
Vol 44 (22) ◽  
pp. 12176-12179 ◽  
Author(s):  
A. Onodera ◽  
M. Hasegawa ◽  
K. Furuno ◽  
M. Kobayashi ◽  
Y. Nisida ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Absorption Edge ◽  
Pressure Dependence ◽  
Optical Absorption Edge

Pressure Dependence of Absorption Edge, Luminescence Peak and Raman Frequency in Wolffram's Red Salt

1985 ◽  
Vol 54 (2) ◽  
pp. 483-486 ◽  
Author(s):  
Hiroshi Tanino ◽  
Naoki Koshizuka ◽  
Koichi Kobayashi ◽  
Masahiro Yamashita ◽  
Koichiro Hoh
Keyword(s):  
Absorption Edge ◽  
Pressure Dependence ◽  
Raman Frequency ◽  
Edge Luminescence ◽  
Luminescence Peak

Pressure dependence of the refractive index in wurtzite and rocksalt indium nitride

2014 ◽  
Vol 105 (23) ◽  
pp. 232111 ◽  
Author(s):  
R. Oliva ◽  
A. Segura ◽  
J. Ibáñez ◽  
T. Yamaguchi ◽  
Y. Nanishi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Pressure Dependence ◽  
Indium Nitride

scholarly journals PRESSURE DEPENDENCE OF THE ABSORPTION EDGE OF SEMIMAGNETIC SEMICONDUCTORS Cd1-xMnxTe

1986 ◽  
Vol 35 (10) ◽  
pp. 1290
Author(s):  
Shan Wei ◽  
Shen Xue-chu ◽  
Zhao Min-guang ◽  
Zhu Hao-rong
Keyword(s):  
Absorption Edge ◽  
Pressure Dependence ◽  
Semimagnetic Semiconductors

The influence of oxygen pressure on lead oxidation kinetics

1980 ◽  
Vol 33 (3) ◽  
pp. 471 ◽  
Author(s):  
GA Hope
Keyword(s):  
Refractive Index ◽  
Pressure Dependence ◽  
Oxidation Kinetics ◽  
Oxidation Rate ◽  
Abrupt Change ◽  
Oxide Interface ◽  
Positive Dependence ◽  
Different Temperatures ◽  
Lead Films ◽  
Lead Oxidation

The dependence of the oxidation rate of lead films on the pressure of oxygen was investigated by ellipsometric and resistance techniques for oxygen pressures between 200 Pa and 100 kPa and in the temperature range 323-423 K. Measurements of the pressure dependence were obtained by studying the change in oxidation rate following an abrupt change in pressure. The results of all experiments indicated a small positive dependence, though significant variations in the values were observed both with extent of oxidation, and between experiments conducted at different temperatures. During the first few minutes of the reaction an unusual trend was noted in the observed kinetics which could be interpreted as being due to absorption of oxygen, by the metal close to the metal-oxide interface, resulting in changes to the metal conductivity and the refractive index, determined by ellipsometry, of the lead substrate.

Pressure dependence of the absorption edge of Cd1−xMnxTe

1984 ◽  
Vol 49 (7) ◽  
pp. 651-653 ◽  
Author(s):  
G. Ambrazevičius ◽  
G. Babonas ◽  
S. Marcinkevičius ◽  
V.D. Prochukhan ◽  
Yu.V. Rud
Keyword(s):  
Absorption Edge ◽  
Pressure Dependence
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