Effect of Copper Concentration on the Optical Properties of Cu2Zn0.8Cd0.2SnS4 Pentrary Alloy Nanostructures

2015 ◽  
Vol 1115 ◽  
pp. 373-377 ◽  
Author(s):  
A.S. Ibraheam ◽  
Y. Al-Douri ◽  
U. Hashim
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Band Gap ◽  
Glass Substrate ◽  
Copper Concentration ◽  
Sol Gel ◽  
Gel Method ◽  
Cu Content ◽  
Alloy Nanostructures ◽  
Effect Of Copper

Cu2Zn0.2Cd0.8SnS4pentrary alloy nanostructures deposited at different molarity copper 0.3, 0. 5, 0. 7 and 0.9 M were grown by sol-gel method on glass substrate. The optical absorption indicates that the band gap of Cu2Zn0.2Cd0.8SnS4nanostructures decreases linearly from 1.80 eV (0.3M 0) to 1.60 eV (0.9M). The transmittance value is in the range 63-49% depending on the Cu content.

Effect of Copper Concentration on Characterization of Cu2Zn0.8Cd0.2SnS4 Pentrary Alloy Nanostructures

2015 ◽  
Vol 754-755 ◽  
pp. 1115-1119 ◽  
Author(s):  
A.S. Ibraheam ◽  
Y. Al-Douri ◽  
Uda Hashim
Keyword(s):  
Spin Coating ◽  
Copper Concentration ◽  
Sol Gel ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force ◽  
Average Grain Size ◽  
Alloy Nanostructures ◽  
Effect Of Copper

Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructure were prepared and deposited on glass substrates with different copper concentrations ( 0.3, 0.5, 0.7 and 0.9 mol/L ) using Sol gel – spin coating method.morphological and analytical studies were investigated by Field Emission-Scanning Electron Microscope (FE-SEM), atomic force microscopy (AFM). It is found that the average grain size of Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructure is 51.92 to 76.43 nm for the thin films prepared at 0.3, 0.5, 0.7 and 0.9 mol/L respectively .

EFFECT OF ANNEALING TEMPERATURE ON OPTICAL PROPERTIES OF TITANIUM DIOXIDE THIN FILMS PREPARED BY SOL-GEL METHOD

2012 ◽  
Vol 06 ◽  
pp. 13-18 ◽  
Author(s):  
M. T. SARODE ◽  
P. N. SHELKE ◽  
S. D. GUNJAL ◽  
Y. B. KHOLLAM ◽  
M. G. TAKWALE ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Annealing Temperature ◽  
Optical Measurement ◽  
Sol Gel ◽  
Fesem Image ◽  
Gel Method ◽  
Sol Gel Method ◽  
Crystallite Sizes

TiO 2 thin films were deposited on glass substrates by sol-gel method. Nanocrystalline TiO 2 thin films were prepared at ambient conditions and titanium tetraisopropoxide [ C 12 H 28 O 4 Ti ] was used as a Ti -precursor. The effect of annealing temperature on optical properties of nanocrystalline TiO 2 thin films was studied. The as-deposited films were dried at 100 °C for 1 hr. The films formed were further heated in temperature between 200 and 500 °C for 1 hr. The films were characterized by different techniques: XRD, UV-visible spectroscopy, FTIR spectroscopy and FESEM. The characterization studies revealed that the films are crystallized as anatase phase and nano-structured with better optical properties α = 0.89 as compared to reported data. The optical measurement showed the indirect band gap between 3.31 and 3.35 eV with corresponding crystallite sizes between 8.9 and 3.7 nm. The FESEM image of film annealed at 400 °C showed spherical nanocrystalline structure of TiO 2 particles. The crystallite sizes obtained from FESEM image are found to be between 30 and 100 nm. It is also observed that refractive index of the film increases with increasing the annealing temperature. The smaller crystallite size gives larger band gap due to quantum size effects.

Properties of TiO2 Thin Film Prepared by Sol-Gel Dip Coating

2015 ◽  
Vol 723 ◽  
pp. 528-531
Author(s):  
Jun Wang ◽  
Ling Yun Bai
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Dip Coating ◽  
Gel Method ◽  
Glass Substrates

TiO2 thin films were prepared on glass substrates by sol-gel method. The effect of withdraw speed on the thickness and optical properties of TiO2 thin films was investigated. The films were transparent in the visible wavelength. The thickness of the TiO2 films was increased from 90 nm for the withdraw speed of 1000 μm/s to 160 nm for the withdraw speed of 2000 μm/s. While, The refractive index of the TiO2 thin film decreased from 2.38 to 2.07. It may be due to the porosity of the film was increased. The optical band-gap of the films was around 3.45 eV.

Optical Properties of CuZn0.8Cd0.2SnS4 Quinternary Alloy Nanostructures

2015 ◽  
Author(s):  
A. S. Ibraheam ◽  
Y. Al-Douri ◽  
U. Hashim ◽  
Waleed K. Ahmed
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Spin Coating ◽  
Band Gap Energy ◽  
Direct Band Gap ◽  
Gap Energy ◽  
Coating Technique ◽  
Cu Content ◽  
Direct Band ◽  
Alloy Nanostructures

Cu2Zn0.8Cd0.2SnS4 quinternary alloy nanostructures were prepared with different copper (Cu) concentrations; 0.3, 0.5, 0.7 and 0.9 mol/L using the spin coating technique. The direct band gap energy of Cu2Zn0.8Cd0.2SnS4 quinternary alloy nanostructures is investigated to decrease as Cu increases. The transmittance value in the range 63–49% is depending on Cu content.

Visible range optical absorption, Urbach energy estimation and paramagnetic response in Cr-doped TiO2 nanocrystals derived by a sol–gel method

2019 ◽  
Vol 21 (24) ◽  
pp. 12991-13004 ◽  
Author(s):  
V. R. Akshay ◽  
B. Arun ◽  
Guruprasad Mandal ◽  
M. Vasundhara
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Urbach Energy ◽  
Sol Gel ◽  
Visible Range ◽  
Tio2 Nanocrystals ◽  
Energy Estimation ◽  
Gel Method ◽  
Doped Tio2 ◽  
Cr Doping

Cr doping leads to narrowing of the band gap and formation of isolated BMPs.

scholarly journals Structural and Optical Properties of ZnO Thin Films Prepared by Molecular Precursor and Sol–Gel Methods

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 132 ◽  
Author(s):  
Theopolina Amakali ◽  
Likius. S. Daniel ◽  
Veikko Uahengo ◽  
Nelson Y. Dzade ◽  
Nora H. de Leeuw
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Structural And Optical Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
Molecular Precursor

Zinc oxide (ZnO) is a versatile and inexpensive semiconductor with a wide direct band gap that has applicability in several scientific and technological fields. In this work, we report the synthesis of ZnO thin films via two simple and low-cost synthesis routes, i.e., the molecular precursor method (MPM) and the sol–gel method, which were deposited successfully on microscope glass substrates. The films were characterized for their structural and optical properties. X-ray diffraction (XRD) characterization showed that the ZnO films were highly c-axis (0 0 2) oriented, which is of interest for piezoelectric applications. The surface roughness derived from atomic force microscopy (AFM) analysis indicates that films prepared via MPM were relatively rough with an average roughness (Ra) of 2.73 nm compared to those prepared via the sol–gel method (Ra = 1.55 nm). Thin films prepared via MPM were more transparent than those prepared via the sol–gel method. The optical band gap of ZnO thin films obtained via the sol–gel method was 3.25 eV, which falls within the range found by other authors. However, there was a broadening of the optical band gap (3.75 eV) in thin films derived from MPM.

scholarly journals Effect of LI Concentration on the Structural and Optical Properties of Co1-xLixCr2O4 Chromate Nanoparticles Prepared By Sol-Gel Method

2021 ◽  
Author(s):  
Muhammad Saeed ◽  
Malika Rani ◽  
Kiran Batool ◽  
Hafiza Batool ◽  
Aisha Younus ◽  
...  
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Sol Gel ◽  
Parent Compound ◽  
Complexing Agent ◽  
Lithium Nitrate ◽  
Structural And Optical Properties ◽  
Sem Images ◽  
Gel Method ◽  
Sol Gel Method

CoCr2O4 and doped lithium Co1-xLixCr2O4 chromate powder and nanoparticles were prepared by modified by sol-gel method. The morphological and structural properties of nano chromates were investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and Photoluminescence (PL). Nanoparticles of doped lithium were synthesized by adding appropriate amount of cobalt nitrate, chromium nitrate, lithium nitrate and 1,2 Ethanediol as a complexing agent. The sample were heated at 105 ˚C for ten hours in oven to obtain dry gel. Calcination temperature for these samples was 700˚C for 3 hours in a furnace. The particle size of parent compound ranges from 4.4 nm to 11 nm, determined by SEM. The tendency of particles to form the aggregates with the increased annealing temperature was observed. The SEM and optical characterization of this compound has shown the sol gel derived material may be successfully used as an effective doped lithium cobalt ceramic pigment with controlled variation in structural and optical properties. SEM images showed that spherical like doped particle have diameter 33nm. From PL spectra Nano structure shows band gap 2.5ev and when we doped Lithium in it band gap decreases and become 1.19ev, which is associated to band gap transition.

Electronic structure and optical properties of spinel structure Zn1-xNixAl2O4 nanopowders synthesized by sol-gel method

2021 ◽  
pp. 138582
Author(s):  
Qiang Lu ◽  
Zhiqiang Wei ◽  
Xiaojuan Wu ◽  
Shangpan Huang ◽  
Meijie Ding ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Spinel Structure ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method
Sign in / Sign up

Export Citation Format

Share Document