scholarly journals Thermal, Electrical, and Optical Properties of Synthesized (1E, 2E)-(4-bromophenyl)(hydroxyimino)acetaldehyde Oxime Complexes

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Emin Karapinar ◽  
Orhan Karabulut ◽  
Nazan Karapinar
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Conductivity Measurements ◽  
Energy Band Gap ◽  
Temperature Dependent ◽  
Electrical And Optical Properties ◽  
Analysis Techniques ◽  
Temperature Dependent Conductivity ◽  
Ft Ir ◽  
Thermal Analysis Techniques

The (1E, 2E)-(4-bromophenyl)(hydroxyimino)acetaldehyde oxime complexes, [ML2], M = Co(II), Cu(II), and Ni(II), were synthesized and characterized by elemental analysis, magnetic susceptibility, FT-IR spectra, and thermal analysis techniques. The optical band gap of this ligand and its complexes were determined by UV-vis spectrophotometer in the wavelength range 300–800 nm. A decrease in the energy band gap of the [CoL2], [NiL2], and [CuL2] complexes has been observed compared with LH ligand. Temperature-dependent conductivity measurements showed that all samples behave like semiconductor. Activation energies calculated from Arrhenius plots showed that the conduction occurs via both intramolecular and the intermolecular processes.

scholarly journals Synthesis of Fluorene Based Alternating Copolymers using Direct Arylation Polymerization

2021 ◽  
Vol 33 (2) ◽  
pp. 393-398
Author(s):  
Mohd Sani Sarjadi ◽  
Yap Leong Khen ◽  
Xin Lin Wong ◽  
Zuhair Jamain ◽  
Md Lutfor Rahman
Keyword(s):  
Solar Cell ◽  
Band Gap ◽  
Active Layer ◽  
Optical Band Gap ◽  
Direct Arylation ◽  
Low Band Gap ◽  
Alternating Copolymers ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Direct Arylation Polymerization

Many researches have been done to obtain a low band gap and high Polymeric solar cell (PSCs) polymer either by creating new polymer or revising reported polymers from previous studies. In present work, two new copolymers were synthesized through direct arylation polymerization to produce poly(9,9-didodecylfluorene-alt-benzo[c][1,2,5]thiadiazole (P1) and poly(9,9-didodecylfluorene-altthieno[ 3,2-b]thiophene) (P2). The P1 and P2 are donor-accepter copolymers. P1 and P2 were compared to investigate its suitability to be applied in PSCs. The polymers obtained were characterized using FT-IR, NMR and UV-Vis spectroscopy. P1 shows two adsorption bands at λmax1 = 243 nm and λmax2 = 320 nm, whereas P2 also shows two adsorption bands at λmax1 = 243 nm and λmax2 = 427 nm. The optical band gap was calculated, P1 enabled band gap of 3.88 eV while P2 showed band gap of 2.91 eV. This work could be provided an insight to design and synthesize more efficient fluorene-based copolymers as active layer of PSCs in due course.

scholarly journals Temperature-Dependent Optical Band Gap in CsPbBr3, MAPbBr3, and FAPbBr3 Single Crystals

2020 ◽  
Vol 11 (7) ◽  
pp. 2490-2496 ◽  
Author(s):  
Giovanni Mannino ◽  
Ioannis Deretzis ◽  
Emanuele Smecca ◽  
Antonino La Magna ◽  
Alessandra Alberti ◽  
...  
Keyword(s):  
Band Gap ◽  
Single Crystals ◽  
Optical Band Gap ◽  
Temperature Dependent

Production of Nanosilica from Iron Tailing and Characterization

2011 ◽  
Vol 295-297 ◽  
pp. 282-285
Author(s):  
Feng Feng Li ◽  
Ming Xi Zhang ◽  
Yi Shen ◽  
Du Jiao ◽  
Gui Qin Hou ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
High Temperature ◽  
Silicon Dioxide ◽  
Chemical Deposition ◽  
Deposition Method ◽  
Analysis Techniques ◽  
Chemical Deposition Method ◽  
Ft Ir ◽  
Thermal Analysis Techniques ◽  
Amorphous Matter

Nanosilica was extracted from iron tailing by the chemical deposition method, involving pickling, filters washing, alkali dissolving of pickling dregs in high temperature, precipitating silica controlled by diluted acid and so on. The product has been studied by SEM, XRD, FT-IR, and thermal analysis techniques, etc. These study shows that the nanosilica is a kind of amorphous matter consists of hydrous silicon dioxide (97.076%) with small amount of sodium and aluminum trapped inside the Si–O network. The diameter of globular silica particles is 30-50 nm.

scholarly journals Semiconducting properties of Ge-doped BaSnO3 ceramic

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Wide Band ◽  
Rate Of Change ◽  
Wide Band Gap ◽  
Electrical And Optical Properties ◽  
Optical Band Gaps ◽  
Semiconducting Properties ◽  
Semiconductor Behavior ◽  
Maximum Conductivity

The electrical and optical properties of Ge-doped BaSnO3 ceramics sintered at varioustemperatures have been investigated to determine their semiconductor behavior. The electricalconductivity of Ge-doped BaSnO3 samples increases with increase in temperature, confirmingthat the samples exhibit a semiconductor behavior. A maximum conductivity value of6.31 × 10−9 S/cm was observed for the sample sintered at 1200 °C. The optical band gaps ofthe Ge-doped BaSnO3 samples were determined by means of reflectance spectra. The variation of optical band gap with temperature was analyzed using Eg(T) = Ego + βT relation. The rate of change of the band gap β of BaSn0.99Ge0.01O3 was found to be 7.6 × 10−4 (eV/°C).A minimum optical band gap value of 2.95 eV was observed for the sample sintered at 1400 °C. It is evaluated that BaSn0.99Ge0.01O3 is a wide band gap semiconductor and its semiconducting properties change with sintering temperature.

Structure and Optical Properties of Quantum Confined Pure and Cu Doped SnO2

2020 ◽  
Vol 1159 ◽  
pp. 60-66
Author(s):  
J.R. Sheeba ◽  
Sathasivam Radhika ◽  
C.M. Padma
Keyword(s):  
Band Gap ◽  
Tin Oxide ◽  
Optical Band Gap ◽  
Green Emission ◽  
Precipitation Method ◽  
Rutile Structure ◽  
Tetragonal Rutile Structure ◽  
Ft Ir ◽  
Tin Oxide Nanoparticles ◽  
Co Precipitation

Pure and copper doped tin oxide nanoparticles were synthesized by co-precipitation method and are characterized by XRD, SEM, EDAX, UV-Visible, photoluminescence, and FT-IR analysis techniques. Tetragonal rutile structure is confirmed from XRD and the crystallite size is found to be between 3.8nm and 4.8nm. The optical band gap is observed from UV-Vis spectrum and is found to be 3.99eV and 3.93eV for tin oxide and copper doped tin oxide respectively. The optical band gap of pure and Copper doped tin oxide were blue shifted due to quantum confinement. Photoluminescence spectrum shows UV, blue and green emission peaks.

Temperature Dependent Structural Studies of K- and RB- Doped C60

1992 ◽  
Vol 270 ◽  
Author(s):  
Otto Zhou ◽  
Qing Zhu ◽  
Gavin B.M. Vaughan ◽  
John E. Fischer ◽  
Paul A. Heiney ◽  
...  
Keyword(s):  
Room Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Temperature Dependent ◽  
X Ray ◽  
Analysis Techniques ◽  
Temperature Range ◽  
Face Centered ◽  
Thermal Analysis Techniques ◽  
Bcc Phase

ABSTRACTThe temperature dependent structural evolutions of RbxC60 (x = 3, 5, 6) and K4C60 were studied using both in-house andsynchrotron x-ray powder diffraction and thermal analysis techniques over a temperature range of 10K - 673K. The superconducting face centered-cubic (fcc) Rb3C60 and the body centered-tetragonal (bct) M4C60(M = K, Rb) phases are found to be line compounds in this temperature range, while the body centered-cubic (bcc) phase forms a solid solution in which the solubility of vacant M sites increases with temperature. The orientation of the C60 molecules in the K4C60 phase was analyzed. A crystalline fcc Rb1C60 phase is stable only above room temperature.

Temperature-dependent optical band gap of the metastable zinc-blende structure β-GaN

1994 ◽  
Vol 50 (12) ◽  
pp. 8433-8438 ◽  
Author(s):  
G. Ramírez-Flores ◽  
H. Navarro-Contreras ◽  
A. Lastras-Martínez ◽  
R. C. Powell ◽  
J. E. Greene
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Temperature Dependent ◽  
Zinc Blende ◽  
Zinc Blende Structure

scholarly journals A Novel Poly{(2,5-diyl furan) (benzylidene)}: A New Synthetic Approach and Electronic Properties

2012 ◽  
Vol 2012 ◽  
pp. 1-7
Author(s):  
Abdelkader Belmokhtar ◽  
Ahmed Yahiaoui ◽  
Aïcha Hachemaoui ◽  
Benyoucef Abdelghani ◽  
Nabahat Sahli ◽  
...  
Keyword(s):  
Band Gap ◽  
Electronic Properties ◽  
Conjugated Polymer ◽  
Optical Band Gap ◽  
Synthetic Approach ◽  
Polar Solvents ◽  
Simple Method ◽  
Sheet Silicate ◽  
Ft Ir ◽  
Silicate Clay

A new conjugated aromatic poly[(furan-2, 5-diyl)-co-(benzylidene)] has been prepared by polycondensation of benzaldehyde and furan catalyzed by Maghnite-H+. Maghnite-H+ is a montmorillonite sheet silicate clay, which exchanged with protons. These polymers can be dissolved in high polar solvents such as DMSO, DMF, THF, or CHCl3 A kind of band-gap conjugated poly[(furan-2, 5-diyl)-co-(benzylidene)] has been synthesized by a simple method and characterized by 1HNMR, 13CNMR, FT-IR, and UV-Vis. The result reveals that the band-gap of the PFB conjugated polymer has an optical band gap of 2.2 eV.

scholarly journals Effect of Samarium Nanoparticles on Optical Properties of Zinc Borotellurite Glass System

2016 ◽  
Vol 846 ◽  
pp. 63-68 ◽  
Author(s):  
Saad S. Hajer ◽  
M.K. Halimah ◽  
Azmi Zakaria ◽  
M.N. Azlan
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Fundamental Absorption Edge ◽  
Xrd Analysis ◽  
Ftir Analysis ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Bonding Parameters ◽  
Optical Energy Band Gap

The glass series of samarium nanoparticles (NPs) doped zinc borotellurite glasses were successfully fabricated by using conventional melt-quenching technique. The structural properties of the prepared glasses were investigated by X-ray diffraction (XRD) analysis and FTIR analysis. It was confirmed that the prepared glasses are amorphous in nature. The bonding parameters of the glasses were analyzed by using FTIR analysis and were found the formation of non-bridging oxygen. The density of these glasses were measured and found to be increased with increasing samarium NPs content. The optical absorption spectra of these glasses were revealed that the fundamental absorption edge shifts to higher wavelengths as the content of Sm2O3 (NPs) increases. The optical energy band gap are found to be decreased linearly with an increasing samarium NPs concentration which is due to the formation of non-bridging oxygen in the glass system.KeywordsBorotellurite glass; optical band gap, Samarium nanoparticles.

S-shaped behaviour of the temperature-dependent energy band gap in dilute nitrides

2003 ◽  
Vol 17 ◽  
pp. 242-244 ◽  
Author(s):  
S. Mazzucato ◽  
R.J. Potter ◽  
A. Erol ◽  
N. Balkan ◽  
P.R. Chalker ◽  
...  
Keyword(s):  
Band Gap ◽  
Energy Band ◽  
Dilute Nitrides ◽  
Energy Band Gap ◽  
Temperature Dependent
Sign in / Sign up

Export Citation Format

Share Document