scholarly journals Synthesis of Polyaniline–Cerium Oxide Nanocomposite for Photodetector Application

2021 ◽  
Vol 2114 (1) ◽  
pp. 012047
Author(s):  
Maryam M. Hassen ◽  
Isam MJbrahim
Keyword(s):  
Cerium Oxide ◽  
Energy Gap ◽  
Pani Film ◽  
X Ray Diffraction ◽  
Cubic Crystal ◽  
Glass Substrates ◽  
Nano Fiber ◽  
Coating Method ◽  
Photoconductive Detectors ◽  
Crystalline Nature

Abstract In this paper nanocomposites materials of Polyaniline (PAni) nano-fiber (NFs) and Cerium oxide (CeO2) nanoparticles (NPs) were prepared by two method; hydrothermal and chemical method respectively. The spin coating method was used to prepare PAni and Pani/CeO2 on Si and glass substrates and then screened with XRD, FE-SEM, UV-Vis and as-prepared thin-film photodetectors. The X-ray diffraction pattern of all the prepared films showed the presence of crystalline nature. It was found that the PAni/CeO2 films have a cubic crystal structure.. FESEM results proved that the PAni film prepared have nanofiber like structure, while the PAni/CeO2 films proved that CeO2 NPs fully caped with PAni nanofiber. The UV-Vis spectra showed peaks of PAni 340nm, 651nm and PAni/CeO2 320nm, 620 nm and in the energy gap it is noticed that the band gap value decreases as the CeO2 ratios increases where the maximum values of energy gap of B-band and Q-band (1.65 – 2.74) eV. The maximum sensitivity values of the photoconductive detectors were observed at PAni/CeO2 (2 vol.%) nanoparticles deposited on n-Si substrate which were approximately (2696.5%, 946.15%, 1402.2%, 1613.9%3837.9%, and 2700%) for wavelengths 360, 465, 510, 595,660 and 965 nm respectively.

scholarly journals The effect of replacing iron atoms instead of zinc of the quaternary compound CZTS

2021 ◽  
Vol 2114 (1) ◽  
pp. 012033
Author(s):  
Abubaker.S. Mohammed
Keyword(s):  
Full Width Half Maximum ◽  
Energy Gap ◽  
Film Surface ◽  
X Ray Diffraction ◽  
Quaternary Compound ◽  
Force Microscopy ◽  
Atomic Force ◽  
Coating Method ◽  
Degree Of Crystallization ◽  
High Degree

Abstract In this article, the quaternary compound Cu2MSnS4 was prepared in a simple and inexpensive approach, where M is the iron (Fe) and zinc (Zn) atoms by the spin coating method on a glass substrate at room temperature (RT), as a result of replacing Zn atoms by Fe. Quaternary Cu2ZnSnS4 (CZTS) and Cu2FeSrS4 (CFTS) structural and optical properties have been studied successfully. The material has been identified by X-ray diffraction, and it was discovered that CZTS has a polycrystalline Tetragonal (kesterite) structure, whereas CFTS has a Tetragonal (stannite) structure. A reduction in the full width half maximum (FWHM) of the preferred plane implies a high degree of crystallization. The structural properties of the film surface, such as grain size and roughness, were studied by Atomic force microscopy (AFM). The results explain an increase in nanoparticle size and surface roughness when Fe is substituted by Zn in the CZTS structure. The absorption coefficient values of all designed compounds in visible regions are greater than 104/cm, and the results show that the absorbance coefficient increases with Fe add. The CZTS films showed an energy gap of 1.88 eV, and this value became 1.69 eV with substituted Fe instead of Zn.

Preparation and Characterization of Nanocrystalline Gadolinium Oxide Powders and Films

2020 ◽  
Vol 850 ◽  
pp. 267-272 ◽  
Author(s):  
Regina Burve ◽  
Vera Serga ◽  
Aija Krūmiņa ◽  
Raimons Poplausks
Keyword(s):  
Electron Microscopy ◽  
Single Phase ◽  
Gadolinium Oxide ◽  
X Ray Diffraction ◽  
Cubic Crystal ◽  
Glass Substrates ◽  
Oxide Powders ◽  
Transmission Electron ◽  
The Mean

Due to its magnetic, electrical, absorption, and emission properties, nanoscale gadolinium oxide is widely used in various fields. In this research, nanocrystalline Gd2O3 powders and films on glass substrates have been produced by the extraction-pyrolytic method. X-ray diffraction analysis revealed the formation of single phase Gd2O3 with cubic crystal structure and the mean crystallite size from 9 to 25 nm in all produced materials. The morphology of samples has been characterized by scanning electron microscopy and transmission electron microscopy.

IMPROVED PROPERTIES OF SnO2 THIN FILMS OBTAINED VIA SPIN COATING METHOD BY VARYING THE SOLUTION CONCENTRATION

2018 ◽  
Vol 25 (04) ◽  
pp. 1850092
Author(s):  
SOUMIA BELHAMRI ◽  
NASR-EDDINE HAMDADOU
Keyword(s):  
Spin Coating ◽  
Visible Spectrum ◽  
Optical Transmittance ◽  
Solution Concentration ◽  
X Ray Diffraction ◽  
Film Properties ◽  
Average Roughness ◽  
Arithmetic Average ◽  
Glass Substrates ◽  
Coating Method

The aim of this work is to study the solution concentration effect on the SnO2 thin film properties, which were deposited on glass substrates by spin coating technique and annealed for one hour at 500[Formula: see text]C. X-ray diffraction (XRD) spectra show that the films deposited at various solution concentrations (0.5[Formula: see text]mol/L, 0.7[Formula: see text]mol/L and 1[Formula: see text]mol/L) are polycrystalline with a tetragonal rutile type. Grains have two preferred orientations along the directions (110) and (101) corresponding to 2[Formula: see text] equal to 26.74[Formula: see text] and 34.11[Formula: see text], respectively. We have also noted that the grain size changes between 109[Formula: see text]nm and 178[Formula: see text]nm. However, the film coated at 10 deposition cycles and 0.7[Formula: see text]mol/L solution concentration has a minimum arithmetic average roughness of 0.376 nm. The optical transmittance of the films in the visible spectrum was in the range of 77–84% and the optical band gap gradually decreases with the decrease of the solution concentration from 4.11[Formula: see text]eV to 3.56[Formula: see text]eV.

Optical Characteristics of Tungsten Oxide Thin Films Prepared by Sputtering Technique

2010 ◽  
Vol 295-296 ◽  
pp. 11-17
Author(s):  
S.A. Aly
Keyword(s):  
Optical Properties ◽  
Tungsten Oxide ◽  
Energy Gap ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
Remarkable Change ◽  
X Ray ◽  
Glass Substrates ◽  
Tungsten Oxide Thin Films ◽  
Reflectance Measurements

The optical properties of tungsten oxide (WO3) films prepared by DC sputtering on unheated glass substrates with different film thicknesses have been studied. The structural characteristics of the samples were investigated using X-ray diffraction. The optical properties of the prepared films were studied by transmittance and reflectance measurements, and the integrated transmittance (TUV, TVIS, and TNIR) and absorption (AUV, AVIS, and ANIR) in UV, VIS and NIR regions. The integrated UV absorption and transmittance are varied with the film thicknesses, also, no remarkable change in VIS and NIR regions was observed. The dependence of refractive index as well as extinction coefficient on wavelength was also reported. The energy gap was calculated and is located around 3.25 eV.

scholarly journals Characteristics and optical properties of Fe3+ doped SiO2/TiO2 thin films prepared by the sol-gel dip-coating method

2013 ◽  
Vol 16 (1) ◽  
pp. 92-100
Author(s):  
Chien Mau Dang ◽  
Dam Duy Le ◽  
Tam Thi Thanh Nguyen ◽  
Dung Thi My Dang
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
Water Contact ◽  
Glass Substrates ◽  
Coating Method ◽  
Dip Coating Method

In this study, we have successfully synthesized Fe3+ doped SiO2/TiO2 thin films on glass substrates using the sol-gel dip-coating method. After synthesizing, the samples were annealed at 5000C in the air for 1 hour. The characteristics and optical properties of Fe3+ doped SiO2/TiO2 films were then investigated by X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis) and Fourier transform infrared spectroscopy (FT-IR). An antifogging ability of the glass substrates coated with the fabricated film is investigated and explained by a water contact angle under visible-light. The analyzed results also show that the crystalline phase of TiO2 thin films comprised only the anatase TiO2, but the crystalline size decreased from 8.8 to 5.9 nm. We also observed that the absorption edge of Fe3+- doped SiO2/TiO2 thin films shifted towards longer wavelengths (i.e. red shifted) from 371.7nm to 409.2 nm when the Fe3+-doped concentration increased from 0 to 1 % mol.

Effects of Annealing on Properties of (Na,Mg):ZnO Thin Films Deposited by Sol-Gel Method

2014 ◽  
Vol 898 ◽  
pp. 33-36 ◽  
Author(s):  
Cai Zhen Zhang ◽  
Yong Gang Chen ◽  
Su Liu
Keyword(s):  
Annealing Temperature ◽  
Sol Gel ◽  
Zno Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
Coating Method ◽  
Method Effects ◽  
Structural Surface ◽  
Co Doped

Na/Mg co-doped (Na,Mg):ZnO films were fabricated on pyrex glass substrates by sol-gel spin-coating method. Effects of annealing on properties of the films were particularly investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmittance spectra. The internal stress of the films annealed at different temperature was calculated. Experimental and analytical results show that some NaCl freeze-out derivatives will appear on films when the annealing temperature is too low, with the increasing annealing temperature, the c-axis tensile stress is sharply decreased first, then the c-axis stress was changed into press stress and its value is increased continuously, so the structural, surface and the optical properties of the films improve first and deteriorate afterwards.

scholarly journals Effect of the Incorporation of Titanium on the Optical Properties of ZnO Thin Films: From Doping to Mixed Oxide Formation

Coatings ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 180 ◽  
Author(s):  
Miriam Yuste ◽  
Ramon Escobar-Galindo ◽  
Noelia Benito ◽  
Carlos Palacio ◽  
Oscar Martínez ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Mixed Oxides ◽  
Energy Gap ◽  
Amorphous Structure ◽  
Zno Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
Wide Range ◽  
Ti Content

ZnO films with Ti atoms incorporated (TZO) in a wide range (0–18 at.%) have been grown by reactive co-sputtering on silicon and glass substrates. The influence of the titanium incorporation in the ZnO matrix on the structural and optical characteristics of the samples has been determined by Rutherford backscattering spectroscopy (RBS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The results indicate that the samples with low Ti content (<4 at.%) exhibit a wurtzite-like structure, with the Ti4+ ions substitutionally incorporated into the ZnO structure, forming Ti-doped ZnO films. In particular, a very low concentration of Ti (<0.9 at.%) leads to a significant increase of the crystallinity of the TZO samples. Higher Ti contents give rise to a progressive amorphization of the wurtzite-like structure, so samples with high Ti content (≥18 at.%) display an amorphous structure, indicating in the XPS analysis, a predominance of Ti–O–Zn mixed oxides. The energy gap obtained from absorption spectrophotometry increases from 3.2 eV for pure ZnO films to 3.6 eV for those with the highest Ti content. Ti incorporation in the ZnO samples <0.9 at.% raises both the blue (380 nm) and green (approx. 550 nm) bands of the photoluminescence (PL) emission, thereby indicating a significant improvement of the PL efficiency of the samples.

EFFECTS OF EXCESSIVE REACTANTS ON THE PROPERTIES OF CADMIUM SULFIDE THIN FILMS PREPARED BY CHEMICAL BATH DEPOSITION

2008 ◽  
Vol 07 (04n05) ◽  
pp. 279-282
Author(s):  
VORRADA LORYUENYONG ◽  
NOPPANUT RUANKUL ◽  
NATTAPON SUPSO ◽  
PONGSATORN CHUNPADUNGSUK
Keyword(s):  
Cadmium Sulfide ◽  
Chemical Bath Deposition ◽  
Quantum Confinement Effect ◽  
Ammonium Hydroxide ◽  
Complexing Agent ◽  
X Ray Diffraction ◽  
Cubic Crystal ◽  
Glass Substrates ◽  
Source Materials ◽  
Cds Films

Cadmium sulfide nanoparticles were synthesized and grown on glass substrates by chemical bath deposition. The method involves the preparation of aqueous solutions containing cadmium chloride ( CdCl 2) and thiourea [ CS ( NH 2)2] as source materials for cadmium and sulfur components, respectively. Ammonium hydroxide ( NH 4 OH )–ammonium chloride ( NH 4 Cl ) solution was used as a complexing agent in this study. The hexagonal and cubic crystal structure of as-deposited CdS films, determined by X-ray diffraction (XRD), is shown. The effects of Cd : S ratio variation on the surface morphology and optical properties of CdS films are also reported. The UV-vis transmission spectrum and SEM micrographs indicated that the Cd : S ratio in the aqueous solution had an impact on the band gap as well as the crystallite size and packing density of the CdS particles due to the quantum confinement effect.

Effect of Film Thickness on Some Optical Properties of Sprayed Pyrolysis Cobalt Oxide Thin Films

2011 ◽  
Vol 316-317 ◽  
pp. 23-29
Author(s):  
S.A. Aly
Keyword(s):  
Optical Properties ◽  
Film Thickness ◽  
Cobalt Oxide ◽  
Energy Gap ◽  
Spray Pyrolysis Technique ◽  
Structural Characteristics ◽  
Wave Length ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Deposited Films

The optical properties of cobalt oxide samples prepared by spray pyrolysis technique on glass substrates with different film thicknesses have been studied. The structural characteristics of the samples were investigated using X-ray diffraction. The optical properties of the prepared films were studied by transmittance and reflectance measurements, and the integrated transmittance (TVIS, and TNIR) and absorptance (AVIS and ANIR) in VIS and NIR regions was calculated and found to be affected by film thickness. The dependence of absorption coefficient on wave length was also reported. The energy gap was calculated and two energies have been observed at 2.15 and 1.5 eV suggesting that the deposited films are semi-conducting with allowed direct transitions.

scholarly journals Structural and Optical Properties of (CdO)1-x(SnO2)x Thin Films Prepared by Pulsed Laser Deposition

2015 ◽  
Vol 59 ◽  
pp. 62-71
Author(s):  
Nahida B. Hasan ◽  
Ghusson H. Mohammed ◽  
Mohammed A. Abdul Majeed
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Energy Gap ◽  
Optical Transition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
Optical Energy Gap ◽  
Glass Substrates ◽  
Cdo Thin Films

CdO thin films have been deposited at different concentration of SnO2 (x= (0.0, 0.05, 0.1, 0.15 and 0.2)) Wt. % onto glass substrates by pulsed laser deposition technique (PLD) using Nd-YAG laser with λ=1064nm, energy=600mJ and number of shots=500. X-ray diffraction (XRD) results reveal that the deposited (CdO)1-x(SnO2)x thin films cubic structure and the grain size increase with increasing annealing temperature and increasing concentration of SnO2. The optical transition in the (CdO)1-x(SnO2)x thin films are observed to be allowed direct transition. The value of the optical energy gap decreases with increasing of annealing temperatures and increase with increasing concentration of SnO2 for all samples.

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