aghdas farghadan; Seyed Ali Hashemizadeh Aghda
Abstract
Today, among the renewable energies, the use of photovoltaic systems, which convert the energy of sunlight directly into electrical energy without producing toxic substances, have received much attention, and despite the extensive development of solar cells and due to their decentralized use, they are ...
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Today, among the renewable energies, the use of photovoltaic systems, which convert the energy of sunlight directly into electrical energy without producing toxic substances, have received much attention, and despite the extensive development of solar cells and due to their decentralized use, they are often placed on the roofs of buildings in cities. They face issues such as rapid sedimentation and absorption of pollutants, as a result, the rate of transmission and absorption of the cell's efficiency decreases. On the other hand, the process of cleaning the surface of solar cells is expensive and causes a waste of water.In this research, the goal is to make a hybrid nanostructured membrane including polysulfone and reduced graphene oxide (PSf/rGO) to improve the efficiency, stability and self-cleaning of the solar cell. This coating increases the stability of solar panels under atmospheric conditions with its water repellency, self-cleaning ability and reduction of light reflection. For the preparation of rGO/PSf hydrophobic membranes, polysulfone has been used among the polymers due to its unique properties, including easy preparation, elastic transparency, and its hydrophobicity. was prepared. SEM, BET, FTIR, FESEM, and contact-angle analyzes were used to check the optimal rGO/PSf layer in the structure. By adding weight percentages (1%, 2%, 4%, 6%) of rGO, the roughness and hydrophobicity of this membrane increases. Nowadays, this membrane is used in various fields such as solar cells, textile industry, etc.
dariush mehrparvar; masome naseri tekyeh; mohsen radmehr
Abstract
ZnxNi1-xO nanostructures were successfully synthesized by sol-gel method using zinc nitrate salt in the impurity percentage range of 3% to 10%. The XRD results showed that changing the impurity percentage could not change the hexagonal structure of samples in such a way that nickel-doped zinc oxide nanostructures ...
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ZnxNi1-xO nanostructures were successfully synthesized by sol-gel method using zinc nitrate salt in the impurity percentage range of 3% to 10%. The XRD results showed that changing the impurity percentage could not change the hexagonal structure of samples in such a way that nickel-doped zinc oxide nanostructures have a hexagonal structure like pure zinc oxide, which indicates that nickel contamination is placed in the zinc position of the crystal structure. Also, in the samples contaminated with x= 7.5% and 10%, the peak related to the crystal network of nickel oxide was observed on hkl [200]. The FT-IR results confirmed the two peaks corresponding to the Ni-O and Zn-O stretching modes in all ZnxNi1-xO nanostructures. In addition, two functional groups, hydroxyl and carboxyl, were observed on the surface of the samples. FESEM results showed that ZnxNi1-xO nanostructures have a spherical shape and particle size between 30 to 60 nm. Examining the results of the UV-Visible spectrum showed that the band gap of nanostructures is dependent on the amount of dopant, so that with the change in the concentration of the dopant element nickel, the amount of the energy gap of the nanostructures changed, and the largest energy gap is related to the sample prepared with 3% by weight of the dopant element.
rostam moradian; zahra eskandari ghaleh; masome naseri tekyeh
Abstract
Quantum dots was successfully synthesized from orange peel by hydrothermal-assisted green method. The XRD analysis result shows that our sample has quantum dots peaks. From the EDAX analysis result, we found that the carbon structure is formed with a weight percentage of 66%, and the presence of the ...
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Quantum dots was successfully synthesized from orange peel by hydrothermal-assisted green method. The XRD analysis result shows that our sample has quantum dots peaks. From the EDAX analysis result, we found that the carbon structure is formed with a weight percentage of 66%, and the presence of the oxygen element is due to the exitant of functional groups and the activation of the surface of the quantum dots, and these group functionals (hydroxyl and depoxy) were also observed in the FTIR analysis. From the FESEM analysis, the sample has a spherical shape. From the examination of the optical properties, we found that the sample shows the most fluorescence properties at the excitation wavelength of 350 nm and has a green color under the UV lamp. XRD, EDAX, FTIR and FESEM analyzes were used to investigation the group functionals and structural properties. To investigated the optical properties, UV-Visible and PL analyzes were used.
Soolmaz Jamali; Ameneh Kargarian; Nargess Razavinia; Mehdi Bakhshzad Mahmoudi
Abstract
The stable and uniform non-thermal plasma in atmospheric pressure produced by the surface dielectric barrier discharge (SDBD) device can be used in various industrial applications. Investigation of the electrical properties, especially the measurement of the power consumption of this device, is significant ...
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The stable and uniform non-thermal plasma in atmospheric pressure produced by the surface dielectric barrier discharge (SDBD) device can be used in various industrial applications. Investigation of the electrical properties, especially the measurement of the power consumption of this device, is significant because of the cost-effectiveness importance of its uses in industries. In this paper, the power consumption of the SDBD system with two different structures has been investigated. For this purpose, two SDBD systems with the same material and dimensions of electrodes and dielectric and two different structures comb and mesh electrodes were designed and constructed. After that, under the same conditions, the power consumption of both systems was measured and compared using the monitoring capacitor method. The purpose of this study is to choose the appropriate structure for the electrode in designing of the SDBD device for various industrial applications.
arisa jazideh; arash boochani; borhan Arghavani Nia; sahar rezaee
Abstract
The structural stability, electronic, magneto-optical properties of CoRuVGa have been studied by GGA approximations. The ferromagnetic phase with a magnetic moment of 2.69 μ_B is more stable than the non-magnetic phase. This structure has elastic stability with Young's and shear modulus of 186.1749 ...
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The structural stability, electronic, magneto-optical properties of CoRuVGa have been studied by GGA approximations. The ferromagnetic phase with a magnetic moment of 2.69 μ_B is more stable than the non-magnetic phase. This structure has elastic stability with Young's and shear modulus of 186.1749 GPa and 5.0 GPa, respectively. Moreover, the phonon scattering diagram shows that this compound has dynamic stability, this structure has metallic behavior. Due to the ferromagnetic behavior of this compound, the Kerr angle in the visible and ultraviolet regions has a counter-clockwise rotation of 0.1 degrees.
fatemeh samadi; nader ghobadi; pouyan ghiasi
Abstract
In this work, the effect of Fe impurity on CuSe nanostructured thin films during the deposition process has been investigated. The Fe impurity introduced into the CuSe nanostructure with different concentrations of 0.01, 0.02, and 0.03 mol was made by a simple chemical solution precipitation method. ...
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In this work, the effect of Fe impurity on CuSe nanostructured thin films during the deposition process has been investigated. The Fe impurity introduced into the CuSe nanostructure with different concentrations of 0.01, 0.02, and 0.03 mol was made by a simple chemical solution precipitation method. Introducing Fe impurity with different concentrations to CuSe creates new transitions related to FeSe in which many band gaps can be observed in the sample. FESEM and EDAX methods for elemental analysis have been used for absorption spectrum to determine energy band distance. In many samples, there are two transitions due to the role of iron in CuSe, therefore, the band gap transitions are related to FeSe and CuSe. A realistic method to determine the band gap energy without considering the assumptions related to the semiconductor structure is necessary, and the Tauc model is a suitable method to determine the band gap distance. Also, from the absorption spectrum of the samples, the Auerbach energy can be determined without the need to determine the absorption coefficient according to the thickness of the layers.