Copper Cermets used as Selective Coatings for Flat Plate Solar Collectors

2008 ◽  
Vol 59 (6) ◽  
Author(s):  
Mihaela Voinea ◽  
Cristina Bogatu ◽  
Gabrielle Charlotte Chitanu ◽  
Anca Duta
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Copper Acetate ◽  
Point Of View ◽  
Solar Collectors ◽  
Ir Spectrometry ◽  
Acetate Methyl ◽  
Spray Pyrolysis Deposition ◽  
Ft Ir ◽  
Cermet Materials

The aim of the present work is to offer a practical mode to obtain thin films of Cu/CuOx cermets by two different methods: electrodeposition and spray pyrolysis deposition (SPD). The cooper precursor in both cases was copper acetate. The films morphology for the SPD samples was optimized by adding copolymers of maleic anhydride with controlled hydrophobia (vinyl acetate/methyl methacrylate) in the precursor�s solution. The samples were characterized from the point of view of: topography (AFM/STM), composition (XRD, using CuKa1), and optical properties (UV-VIS and FT-IR spectrometry). These cermet materials are extensively studied due to their applications as selective coatings for solar collectors.

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.

Preparation and Characterization of Cu-Doped Zno Sol-Gel Derived Optical Thin Films

2013 ◽  
Vol 802 ◽  
pp. 124-128 ◽  
Author(s):  
Krisana Chongsri ◽  
Siriwattana Aunpang ◽  
Wicharn Techitdheera ◽  
Wisanu Pecharapa
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Copper Acetate ◽  
Visible Region ◽  
Ambient Air ◽  
Doping Content ◽  
Acetate Dihydrate ◽  
Cu Doping ◽  
Doped Zno

In this work, we report the preparation of Cu-doped ZnOthin films by sol-gel method based on zinc acetate dihydrate (CH3COO)2Zn·2H2O, Copper acetate dihydrate Cu3(CH3COO)2·H2O) and diethanolamine (HN(CH2OH)2, DEA). The precursor solution was prepared at various Cu composition ranging from 2-20 wt%. All films were spin-coated on borosilicate substrates for several coating repetition followed by annealing process at 550 °C for 4 h in an ambient air. The structural properties of the films were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD results indicate the domination of hexagonal wurtzite structure of ZnO with noticeable alternation in the XRD peak intensity upon Cu doping content. SEM results revealed the grain size shape and surface morphologies of as-prepared samples. Crucial optical properties of as-prepared films were scrutinized from their UV-Vis transmission spectra. The films are highly transparent in the visible region with more than 90 % transparency within 380 nm to 800 nm. Their corresponding band gaps indicate significant red shift with increasing Cu doping content. Overall results suggest that Cu additive play a vital role on relevant optical properties of ZnO that can be adjusted to meet the requirement for practical optoelectronics applications.

scholarly journals Effect of High Density Polyethylene (HDPE) on Structural and Optical Properties of (PP/PMMA) Blends

2015 ◽  
Vol 60 ◽  
pp. 94-106
Author(s):  
Majeed Ali Habeeb ◽  
Ahmed Hamza Abbas
Keyword(s):  
Dielectric Constant ◽  
Optical Properties ◽  
High Density Polyethylene ◽  
Refraction Index ◽  
High Density ◽  
Band Gaps ◽  
Ir Spectrometry ◽  
Ft Ir ◽  
Pmma Blends ◽  
Dielectric Constant Increase

In the present work, Polypropylene (PP) was blended with poly methyl methacrylate (PMMA) to form (PP/PMMA) polymer blends. High Density Polyethylene (HDPE) was mixed into these blends at different weight fractions (2,4,6,8) % wt to form (PP/PMMA/HDPE) blends were prepared using an one screw extruder. results obtained from Scanning Electron Microscopy (SEM) revealed that there was a reduction in surface roughness any decrease in clusters, drilling and bends, as for Fourier Transform Infrared (FT-IR) spectrometry showed no change in the wave numbers of the functional groups. The optical properties of samples are investigated by measuring optical absorption spectra in the wavelength range from 260 to 1100 nm. this results show that Eg of the blends increases with increasing high density polyethylene contents, the indirect optical band gaps for (PP/PMMA) and (PP/PMMA/HDPE) blends were estimated to be about 2.83,2.9,2.95,3and 3.1 eV for indirect allowed transitions, whereas the indirect forbidden band gaps were determined as 2,2.1,2.15,2.2 and 2.3 eV with increase high density Polyethylene contents, respectively. The absorbance, absorption coefficient, extinction coefficient and the imaginary dielectric constant of (PP/PMMA/HDPE) decreases with increasing of HDPE percentages except the transmittance, refraction index and real part of the dielectric constant increase with increasing of high density polyethylene.

scholarly journals Effect of Annealing Temperature in Improvement the Optical Properties of TiO2 Doped Fe2O3 to Use in Thin Film

2019 ◽  
pp. 1-12
Author(s):  
Abubakr Mahmoud Hamid ◽  
Hassan Wardi Hassan ◽  
Fatima Ahmed Osman
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Refractive Index ◽  
Optical Properties ◽  
Iron Oxide ◽  
Titanium Oxide ◽  
Extinction Coefficient ◽  
Tio2 Thin Film ◽  
Annealing Temperature ◽  
Spray Pyrolysis Deposition

Solar energy is already has being widely successfully used in residential and industrial setting for thermal and electrical application such as space technology, communication, etc. I. Aims: The aim of this study the effect of the annealing temperature in improvement optical properties of titanium oxide nanostructure doped iron oxide for use in thin film. Study Design: The spray pyrolysis deposition method used for preparation the nanostructure material. Place and Duration of Study: This study was conducted in department of physics and department of materials sciences, Al-Neelain University, between January 2016 and January 2019.  Methodology: Thin films of Titanium Oxide (TiO2) doped Iron Oxide (Fe2O3) have been prepared by chemical spray pyrolysis deposition technique. A laboratory designed glass atomizer was used for spraying the aqueous solution. Which has an output nozzle about 1 mm. then film were deposited on preheated cleaned glass substrates at temperature of 400°C. we used different concentration to study optical parameters. A 1.5 g TiO2 powder of anatase structure doped with 1.5 g of Fe2O3 was mixed with 2 ml of ethanol and stirred using a magnetic stirrer for 30 minutes to form TiO2 paste to obtain the starting solution for deposition and spray time was 10 s and spray interval 2 min was kept constant. The carrier gas (filtered compressed air) was maintained at a pressure of 105 Nm-2, and distance between nozzle and substrate was about 30 cm ± 1 cm. Thickness of sample was measured using the weighting method and was found to be around 400nm. Optical transmittance and absorbance were record in wavelength range of (200-1100) nm using UV-Visible spectrophotometer (Shimadzu Company Japan). Results: The results obtained showed that the optical band gap decreased from 5.6eV before annealing to (3.9, 3.26, 3.24 and 3.27 eV) after annealing temperature at(450° – 500°) for TiO2:Fe2O3 thin films, this result refer to the broadening of  secondary levels that product by TiO2: doping to the Fe2O2thin films. Also the results showed the variation of refractive index with wavelength for different concentration after annealing temperature at (450° – 500°) of TiO2: Fe2O3 films from this figure, it is clear that n decrease with low concentration and increase with high concentration after annealing temperature that mean the density is decreased of this films. In addition the extinction coefficient of TiO2:Fe2O3 thin films recorded before annealing and with different concentration (1.1, 1.2, 1,5 and 1,6) and in the range of (300 – 1200) nm and at annealing temperature from (450° – 500°). It observed from that the extinction coefficient, decrease sharply with the increase of wavelength for all prepared films and all the sample after annealing is interference between them accept the sample before annealing is far from the other sample. Conclusion: The TiO2 thin film shows better result after annealing; By exposing temperature during annealing process degree at (450o- 500o) is found to be the best temperature for annealing TiO2 thin film. The study concluded that an annealing temperature Contributes to the improvement of optical properties related to increasing the efficiency of the solar cell, especially the refractive index, energy gap, extinction coefficient.

scholarly journals Spray Pyrolysis Deposition and Effect of Annealing Temperature on Optical Properties of Cu:NiO Film

2015 ◽  
Vol 47 ◽  
pp. 178-184 ◽  
Author(s):  
Khalid Haneen Abass
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spray Pyrolysis ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Spray Pyrolysis Method ◽  
Spectral Transmittance ◽  
Pyrolysis Method ◽  
Spray Pyrolysis Deposition ◽  
Uv Visible

Spray pyrolysis method that used to prepare Cu:NiO thin films onto glass substrate with various annealing temperature. Spectral transmittance of prepared thin films determined by UV-Visible spectrophotometer in the range of (380-900) nm. The transmittance decreased with increasing annealing temperature. While the absorption coefficient and extinction coefficient increased with increasing annealing temperature. Energy gap decreased from 2.9 eV before annealing to 2.78 eV after 500 °C annealing temperature.

scholarly journals Studies and Research on Obtaining Multifunctional Thin Films by Magnetron-Assisted PVD Process

2021 ◽  
Vol 44 (3) ◽  
pp. 22-26
Author(s):  
Simona BOICIUC
Keyword(s):  
Thin Films ◽  
Corrosion Resistance ◽  
Optical Properties ◽  
Point Of View ◽  
Discharge Power ◽  
Structure And Properties ◽  
Power Increase ◽  
Spraying Process ◽  
Deposited Films ◽  
Structural Point

The paper aims to obtain thin films of nickel and zinc through the magnetron-assisted spraying process and their characterization from a structural point of view, of electrical, optical properties and corrosion resistance. It was found that as the intensity and discharge power increase, changes occur in the structure and properties of the deposited films.

Synthesis and Electro-Optical Properties of Potassium Titanyl Phosphate thin Films by Sol-Gel Method

1997 ◽  
Vol 495 ◽  
Author(s):  
Jianping Zhang ◽  
Burtrand I. Lee ◽  
Feiling Wang ◽  
Melvin A. Leitheiser
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Optical Properties ◽  
Sol Gel ◽  
Structural Evolution ◽  
Optical Devices ◽  
Potassium Titanyl Phosphate ◽  
Sol Gel Process ◽  
Potential Applications ◽  
Ft Ir

ABSTRACTPotassium titanyl phosphate, KTiOPO4 (KTP), thin films were prepared by sol-gel process. The structural evolution of KTP thin films was investigated by means of DTA/TGA, XRD, and FT-IR. The electro-optical results show that KTP thin films have a refractive index of 1.8 and large quadratic electro-optical coefficient of R=2.50643*10−16 and have potential applications for electro-optical devices.

OPTICAL PROPERTIES OF BMN-BT FERROELECTRIC THIN FILMS PREPARED BY SPRAY PYROLYSIS DEPOSITION

2012 ◽  
Vol 26 (02) ◽  
pp. 1150009 ◽  
Author(s):  
M. GHASEMIFARD
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Spray Pyrolysis ◽  
Perovskite Phase ◽  
Band Gap Energy ◽  
Spray Pyrolysis Method ◽  
Vis Spectroscopy ◽  
Spray Pyrolysis Deposition ◽  
Aluminum Substrates

By using spray pyrolysis method, 0.65 Ba ( Mg 1/3, Nb 2/3) O 3-0.35 BaTiO 3 thin films were deposited on glass/aluminum substrates. The effect of annealing temperature on perovskite phase and crystalline structure analysis of the BMN-BT films performed on an X-ray diffraction (XRD). The optical properties of the resultant materials have been characterized as a function of substrate's temperature. The absorption coefficient (α) and extinction coefficient (k) of the films are obtained by using UV-vis spectroscopy. The band gap energy values of the films using analysis of the absorption coefficient and Tauc's formula have also been determined. For films deposited at different substrate temperatures, direct transitions occur with energies varying from 4.57 eV to 4.21 eV.

Enhancement of Solar Cell Efficiency by Using TiO2 Nanostructure Doped Fe2O3 Dye and Effect Concentration of Solvent on Optical Properties

2019 ◽  
pp. 1-14
Author(s):  
Abubakr Mahmoud Hamid ◽  
Hassan Wardi Hassan ◽  
Fatima Ahmed Osman
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Solar Cell ◽  
Spray Pyrolysis ◽  
Titanium Oxide ◽  
Deposition Method ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Spray Pyrolysis Deposition

Solar energy has the greatest potential of all the sources of renewable energy, as only a small amount of this form of energy could be used, especially when other sources (coal, oil or gas) in the country have depleted. A solar cell is a solid electrical device that converts solar energy directly to electricity. Hybrid solar cells based on inorganic and organic compounds are a promising renewable energy source. Aims: The aim of this study was to prepare a nanostructured thin film of titanium oxide: doped iron oxide for enhancement of solar cell efficiency. In addition to studying the effect doped on optical properties of titanium oxide nanostructure thin film. Study Design: The spray pyrolysis deposition method used for preparation the nanostructure material. Place and Duration of Study: This study was conducted in the department of physics and department of materials sciences, Al-neelain university, between January 2016 and January 2019. Methodology: Thin films of Titanium Oxide (TiO2) doped Iron Oxide (Fe2O3) have been prepared by chemical spray pyrolysis deposition technique. A laboratory designed glass atomizer was used for spraying the aqueous solution. Which has an output nozzle about 1mm then the film was deposited on preheated cleaned glass substrates at the temperature of 400ºC. we used different concentration to study optical parameters. A 1.5 g TiO2 powder of anatase structure doped with 1.5 g of Fe2O3 was mixed with 2 ml of ethanol and stirred using a magnetic stirrer for 30 minutes to form TiO2 paste to obtain the starting solution for deposition and spray time was 10 s and spray interval 2 min was kept constant. The carrier gas (filtered compressed air) was maintained at a pressure of 105 Nm-2, and distance between nozzle and substrate was about 30 cm ± 1 cm. The thickness of the sample was measured using the weighting method and was found to be around 400 nm. Optical transmittance and absorbance were records in the wavelength range of (200-1100) nm using UV-Visible spectrophotometer (Shimadzu Company Japan). Results: The results obtained showed that the optical band gap decreased from 5.58 eV before doping to (3.9, 3.81, 3.81 and 3.81 eV) after doped for TiO2:Fe2O3 thin films, this result refers to the broadening of secondary levels that product by TiO2: doping to the Fe2O2 thin films. Also, the results showed the variation of refractive index with wavelength for different concentration after doped of TiO2:Fe2O3 films from this figure, it is clear that n decrease with low concentration and increase with high concentration after doped that mean the density is decreased of this films. In addition the extinction coefficient of TiO2:Fe2O3 thin films recorded before doped and with different concentration (1.1, 1.2, 1.5 and 1.6 mol/L) and in the range of (300 – 1200) nm and after doped it observed from that the extinction coefficient, decrease sharply with the increase of wavelength for all prepared films and all the sample after doped is interference between them accept the sample before annealing is far from the other sample. Conclusion: Based on the results obtained doping of titanium oxide increases the efficiency of TiO2 thin film in DSSC. It also proves that the fabrication of TiO2 thin films by spray pyrolysis deposition method is successful.

Preparation, characterization, spectroscopic (FT-IR, FT-Raman, UV and visible) studies, optical properties and Kubo gap analysis of In2O3 thin films

2013 ◽  
Vol 1049 ◽  
pp. 239-249 ◽  
Author(s):  
M. Jothibas ◽  
C. Manoharan ◽  
S. Ramalingam ◽  
S. Dhanapandian ◽  
S. Johnson Jeyakumar ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Gap Analysis ◽  
Ft Ir ◽  
Ft Raman
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