scholarly journals Effect of sample thickness on the structural and optical properties of Polyvinyl Chloride/Zinc Oxide Nanocomposite Films for photocatalysis application

2021 ◽  
Author(s):  
aimane guedri ◽  
Mourad ZAABAT ◽  
Boubekeur BOUDINE ◽  
Abdelkader HAFDALLAH
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Polyvinyl Chloride ◽  
Spin Coating ◽  
Visible Region ◽  
Nanocomposite Films ◽  
Structural Defects ◽  
X Ray Diffraction ◽  
Lower Efficiency ◽  
X Ray

Abstract Considered Technique spin coating of the most important techniques used to prepare thin films because it is easy to use and inexpensive since it is closely dependent on the number of layers deposited. This work aims to study the effect of samples thickness for nanocomposites of polyvinyl chloride doped with zinc oxide nanoparticles on the structural, optical properties, and photocatalytic activities. Nanocomposite films of polyvinyl chloride (PVC) - zinc oxide (ZnO) with a different number of the deposited layers (15, 20, 25, and 30 layers) were synthesized by a sol-gel method (spin coating) using tetrahydrofuran as a solvent, and investigated by various techniques. X-ray diffraction measurements indicated in the case of 15, 20, and 25 layers do not clearly show the presence of diffraction peaks. On the other hand, in the case of 30 layers, the presence of several peaks is observed, which testify to the presence of ZnO crystallites of wurtzite structure in PVC films. The size of the crystallites is almost equal to 32 nm depending on the working conditions. Raman and infrared spectra confirmed the result of X-ray diffraction on the incorporation of ZnO crystallites in the films produced by showing peaks corresponding to the modes of vibration of the crystal lattice of the ZnO doping semiconductor. Optical transmittance spectra have shown that The layers obtained have an optical transmission varying from 75 to 86% in the visible region of the spectrum. The values of the band gap energies, determined from the transmission spectra for the films deposited on glass, vary between 3.45 and 3.94 eV. The Photoluminescence spectra of ZnO/PVC nanocomposites studied revealed a strong ultraviolet and green luminescence, attributed to structural defects in the zinc oxide. The photocatalytic reaction has been shown using MB in the UV irradiation action of films stacked in an MB solution. The result showed that the 30-layer (PVC / ZnO) sample gave an efficiency to remove MB of 79% at 60 min, Similar to other samples which gave a lower efficiency.

scholarly journals The influence of the Samples thickness on the structural and optical properties of Polyvinyl Chloride/Zinc Oxide Nanocomposite Films: Application in catalytic degradation of methylene blue dye.

2021 ◽  
Author(s):  
Aimane GUEDRI ◽  
Mourad ZAABAT ◽  
Boubekeur BOUDINE ◽  
Abdelkader HAFDALLAH
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Polyvinyl Chloride ◽  
Spin Coating ◽  
Visible Region ◽  
Nanocomposite Films ◽  
Structural Defects ◽  
Blue Dye ◽  
X Ray Diffraction ◽  
X Ray

Abstract Considered Technique spin coating of the most important techniques used to prepare thin films because it is easy to use and inexpensive since it is closely dependent on the number of layers deposited. This work aims to study the effect of samples thickness for nanocomposites of polyvinyl chloride doped with zinc oxide nanoparticles on the structural, optical properties, and photocatalytic activities. Nanocomposite films of polyvinyl chloride (PVC) - zinc oxide (ZnO) with a different number of the deposited layers (15, 20, 25, and 30 layers) were synthesized by a sol-gel method (spin coating) using tetrahydrofuran as a solvent, and investigated by various techniques. X-ray diffraction measurements indicated in the case of 15, 20, and 25 layers do not clearly show the presence of diffraction peaks. On the other hand, in the case of 30 layers, the presence of several peaks is observed, which testify to the presence of ZnO crystallites of wurtzite structure in PVC films. The size of the crystallites is almost equal to 32 nm depending on the working conditions. Raman and infrared spectra confirmed the result of X-ray diffraction on the incorporation of ZnO crystallites in the films produced by showing peaks corresponding to the modes of vibration of the crystal lattice of the ZnO doping semiconductor. Optical transmittance spectra have shown that The layers obtained have an optical transmission varying from 75 to 86% in the visible region of the spectrum. The values of the band gap energies, determined from the transmission spectra for the films deposited on glass, vary between 3.45 and 3.94 eV. The Photoluminescence spectra of ZnO/PVC nanocomposites studied revealed a strong ultraviolet and green luminescence, attributed to structural defects in the zinc oxide. The photocatalytic reaction has been shown using MB in the UV irradiation action of films stacked in an MB solution. The result showed that the 30-layer (PVC / ZnO) sample gave an efficiency to remove MB of 79% at 60 min, Similar to other samples which gave a lower efficiency.

Synthesis, Characterization and Optical Properties of PLA / P3HT Blends Thin Films

2021 ◽  
Vol 19 (5) ◽  
pp. 132-138
Author(s):  
Maan Abd-Alameer Salih ◽  
Q.S. Kareem ◽  
Mohammed Hadi Shinen
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Ring Opening ◽  
Energy Gap ◽  
Ring Opening Polymerization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Conductivity Increase ◽  
Ft Ir

In this exploration Poly lactic corrosive (PLA) was orchestrated the ring-opening polymerization Poly lactic corrosive (PLA) blended with poly(3-hexylthiophene) (P3HT) which prepared by solution. Blends thin films Synthesis by spin coating technique and using Tetrahydrofuran (THF) as solvent. PLA powder was 'characterized by' 'X-ray' 'diffraction', '(FT-IR)'. pure Optical properties (PLA), (PLA)/P3HT blends thin films with different percentage of P3HT (0, 1, 2, and 3) wt% were investigated using UV-VS spectroscopy The results showed that the absorption, absorption coefficient, extinction coefficient and conductivity increase with increasing the rate of deformation P3HT, The energy gap decreases with increasing deformation.

Growth and Magneto-Optical Properties of CaTbAlO4 Crystal

2011 ◽  
Vol 306-307 ◽  
pp. 1722-1727 ◽  
Author(s):  
Man Mei ◽  
Li Li Cao ◽  
Yan He ◽  
Ru Ru Zhang ◽  
Fei Yun Guo ◽  
...  
Keyword(s):  
Optical Properties ◽  
Single Crystal ◽  
Room Temperature ◽  
Near Infrared ◽  
Visible Region ◽  
Czochralski Method ◽  
Optical Devices ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectral

The calcium terbium aluminate (CaTbAlO4) single crystal was grown by Czochralski method successfully for the first time.The structure of the crystal was determined by X-ray diffraction analysis.The transmission spectrum of the crystal was measured at room temperature at the wavelength of 400-1500nm.The specific Faraday rotation of the single crystal was surveyed at room temperature at the wavelength 532nm, 633nm, and 1064nm respectively.The Verdet constants of the CaTbAlO4 crystal are calculated and the results show that the Verdet constants of CaTbAlO4 are around 110% higher than that of TGG in the visible and near-infrared spectral region.Therefore,crystal CaTbAlO4 can be promising material for the fabrication of magneto-optical devices in the visible region.

scholarly journals Preparation and Characterization of Zinc Oxide (Zno)/Polymethyl Methacrylate (PMMA) Nanocomposites

2021 ◽  
Vol 04 (04) ◽  
Author(s):  
Jayashree Bagawade ◽  
Keyword(s):  
Zinc Oxide ◽  
Methyl Methacrylate ◽  
Zinc Oxide Nanoparticles ◽  
Nanocomposite Films ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Absorption Measurements

A series of novel zinc oxide / Poly (methyl methacrylate) nanocomposite films with different ZnO contents were prepared through inclusion of pre-synthesized zinc oxide nanoparticles. The physical composition and morphology of the as-prepared nanocomposites were studied by XRD and TEM. The TEM analyses revealed that the zinc oxide nanoparticles have a particle size of ~3–5 nm. X-ray diffraction proved the presence of the amorphous PMMA in the nanocomposites. The intermolecular interactions within the polymer nanocomposites were explored by FTIR and XRD. FTIR spectra confirmed the dispersion of the zinc oxide nanoparticles in the Poly (methyl methacrylate) i.e. PMMA matrices. The UV-Vis absorption measurements of the ZnO/PMMA nanocomposites proved their potential optical properties.

Optical Properties of CulnSi Nanocomposite Thin Film Deposited by Magnetron Co-Sputtering

2011 ◽  
Vol 403-408 ◽  
pp. 1089-1093
Author(s):  
Jian Sheng Xie ◽  
Jin Hua Li ◽  
Luan Ping
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Optical Absorption ◽  
Nanocomposite Films ◽  
Nanocomposite Thin Film ◽  
X Ray Diffraction ◽  
X Ray ◽  
Double Beam ◽  
Absorption Studies ◽  
Xrd Studies

Thin CuInSi nanocomposite films were prepared by magnetron co-sputtering. The structures of CuInSi nanocomposite films were detected by X-ray diffraction(XRD); XRD studies of the annealed films indicate the presence of CuInSi, the main crystal phase peak is at 2θ=42.400°. The transmittance (T) spectra of the films were measured by Shimadzu UV-2450 double beam spectrophotometer. The band gap has been estimated from the optical absorption studies and found to be about 1.40 eV, but changes with purity of CuInSi.

Influences of Preheating Temperature on the Structural and Optical Properties of ZnO Thin Films by So-Gel Spin Coating Technique

2014 ◽  
Vol 925 ◽  
pp. 401-405 ◽  
Author(s):  
Sharul Ashikin Kamaruddin ◽  
Mohd Zainizan Sahdan ◽  
Kah Yoong Chan ◽  
Nayan Nafarizal ◽  
Hashim Saim
Keyword(s):  
Optical Properties ◽  
Spin Coating ◽  
Sol Gel ◽  
Spin Coating Technique ◽  
Zno Films ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Coating Technique ◽  
Preheating Temperature

The Zinc Oxide (ZnO) films were fabricated on glass coated with indium tin oxide (ITO) substrate by sol-gel spin coating technique. With regard to the preheating temperatures, the effects of growth mechanism ZnO films on the optical and structural properties were investigated. In this study, the preheating temperatures were varied from 250°C, 280°C, and 300°C. The X-ray diffraction (XRD) and ultraviolet-visible (UV-Vis) spectroscopy were used to examine the structural and optical properties of the ZnO films. The XRD results revealed that, the ZnO films are highly crystalline for all samples which are dominated by (002) peak orientation. Meanwhile, observation from optical results indicated that, the variation of transmittance spectra were turn out and it is proportional to the preheating temperatures used. Overall, we realized that the properties of the ZnO films in the sol-gel spin coating technique strongly depend on the preheating temperature and need to be considered as important factor to obtain the high-quality of the ZnO films. Keywords: Sol-gel, Zinc oxide film, X-ray diffraction

scholarly journals Impact of Dy2O3 Substitution on the Physical, Structural and Optical Properties of Lithium–Aluminium–Borate Glass System

2020 ◽  
Vol 10 (22) ◽  
pp. 8183
Author(s):  
Osama Bagi Aljewaw ◽  
Muhammad Khalis Abdul Karim ◽  
Halimah Mohamed Kamari ◽  
Mohd Hafiz Mohd Zaid ◽  
Noramaliza Mohd Noor ◽  
...  
Keyword(s):  
Optical Properties ◽  
Excited States ◽  
Visible Region ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Melt Quenching ◽  
Laser Applications ◽  
X Ray ◽  
Lithium Aluminium ◽  
Prepared Glass

In this study, a series of Li2O-Al2O3-B2O3 glasses doped with various concentrations of Dy2O3 (where x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 mol%) were prepared by using a conventional melt-quenching technique. The structural, physical and optical properties of the glasses were examined by utilising a variety of techniques instance, X-ray diffraction (XRD), UV–Vis-NIR spectrometer, Fourier transform infrared (FTIR) and photoluminescence (PL). The XRD spectra demonstrate the amorphous phase of all glasses. Furthermore, the UV-vis-NIR spectrometers have registered optical absorption spectra a numbers of peaks which exist at 1703, 1271, 1095, 902, 841, 802, 669, 458, 393 and 352 nm congruous to the transitions from the ground of state (6H15/2) to different excited states, 6H11/2, 6F11/2 + 6H9/2, 6F9/2 + 6H7/2, 6F7/2, 6F5/2, 6F3/2, 4F9/2, 4I15/2, 4F7/2 and 6P7/2, respectively. The spectra of emission exhibit two strong emanation bands at 481 nm and 575 nm in the visible region, which correspond to the transitions 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2. All prepared glass samples doped with Dy2O3 show an increase in the emission intensity with an increase in the concentration of Dy3+. Based on the obtained results, the aforementioned glass samples may have possible applications, such as optical sensor and laser applications.

scholarly journals Enhancement of Hydrogen Productions by Accelerating Electron-Transfers of Sulfur Defects in the CuS@CuGaS2 Heterojunction Photocatalysts

Catalysts ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 41 ◽  
Author(s):  
Namgyu Son ◽  
Jun Heo ◽  
Young-Sang Youn ◽  
Youngsoo Kim ◽  
Jeong Do ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Production ◽  
Uv Light ◽  
Visible Region ◽  
Production Performance ◽  
Structural Defects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Electron Transfers

CuS and CuGaS2 heterojunction catalysts were used to improve hydrogen production performance by photo splitting of methanol aqueous solution in the visible region in this study. CuGaS2, which is a chalcogenide structure, can form structural defects to promote separation of electrons and holes and improve visible light absorbing ability. The optimum catalytic activity of CuGaS2 was investigated by varying the heterojunction ratio of CuGaS2 with CuS. Physicochemical properties of CuS, CuGaS2 and CuS@CuGaS2 nanoparticles were confirmed by X-ray diffraction, ultraviolet visible spectroscopy, high-resolution transmission electron microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. Compared with pure CuS, the hydrogen production performance of CuGaS2 doped with Ga dopant was improved by methanol photolysis, and the photoactivity of the heterogeneous CuS@CuGaS2 catalyst was increased remarkably. Moreover, the [email protected] catalyst produced 3250 μmol of hydrogen through photolysis of aqueous methanol solution under 10 h UV light irradiation. According to the intensity modulated photovoltage spectroscopy (IMVS) results, the high photoactivity of the CuS@CuGaS2 catalyst is attributed to the inhibition of recombination between electron-hole pairs, accelerating electron-transfer by acting as a trap site at the interface between CuGaS2 structural defects and the heterojunction.

Effects of Fe and Ni Co-Doping on the Optical Properties of TiO2 Thin Films

2019 ◽  
Vol 19 (01) ◽  
pp. 1850046
Author(s):  
Mahboubeh Yeganeh ◽  
Maliheh Mousavi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Oxygen Vacancies ◽  
Visible Region ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Tio2 Thin Films ◽  
X Ray ◽  
Co Doping ◽  
Uv Visible

In this work, the effects of Fe/Ni co-doping on structural and optical properties of TiO2 thin films were investigated by the X-ray diffraction, scanning electron microscope and UV-visible spectroscopy. The optical properties of transmittance, extinction coefficient, refractive index, real and imaginary parts of dielectric constant of the thin films, prepared by spray pyrolysis, revealed that the absorption in visible region increases due to the influence of Fe/Ni co-doping. The widening of the gap energies is observed as a result of doping. The increased optical gap as a consequence of doping can be explained by decreasing the size of nanoparticles, as confirmed by SEM and increasing the formation of oxygen vacancies as a result of Ni[Formula: see text] substitution to Ti[Formula: see text] and appearance of the Burstein–Moss effect.

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