Pub Date : 2023-07-05DOI: 10.15251/jor.2023.193.307
A. Kamarchou, A. Zobeidi, I. Kemerchou, A. Khechekhouche, A. Kaddour, B. Hammadi
When compared to solar cells made from other materials, perovskites provided better performance in organic or inorganic hybrid solar cells. But one of the biggest problems facing scientists working in the photovoltaic industry right now is improving the stability of Perovskite solar cells. Despite their enormous potential, which exceeds that of traditional photovoltaic solar cells, these cells' low stability inhibits their commercialisation. In the current study, we looked at how the temperature of the substrate affected the physical characteristics of Perovskite thin films produced by spray pyrolysis using a moving nozzle. X-ray diffraction, scanning electron microscopy pictures, ultraviolet and visible absorption spectroscopy, and other methods were used to characterize the produced films. The results demonstrate that 90°C is the ideal deposition temperature.
{"title":"Enhanced resistance to degradation in sprayed perovskite CH3NH3PbI3 induced by the temperature","authors":"A. Kamarchou, A. Zobeidi, I. Kemerchou, A. Khechekhouche, A. Kaddour, B. Hammadi","doi":"10.15251/jor.2023.193.307","DOIUrl":"https://doi.org/10.15251/jor.2023.193.307","url":null,"abstract":"When compared to solar cells made from other materials, perovskites provided better performance in organic or inorganic hybrid solar cells. But one of the biggest problems facing scientists working in the photovoltaic industry right now is improving the stability of Perovskite solar cells. Despite their enormous potential, which exceeds that of traditional photovoltaic solar cells, these cells' low stability inhibits their commercialisation. In the current study, we looked at how the temperature of the substrate affected the physical characteristics of Perovskite thin films produced by spray pyrolysis using a moving nozzle. X-ray diffraction, scanning electron microscopy pictures, ultraviolet and visible absorption spectroscopy, and other methods were used to characterize the produced films. The results demonstrate that 90°C is the ideal deposition temperature.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48774401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-05DOI: 10.15251/jor.2023.194.351
M. S. Viswaksenan, A. Simi, A. Panneeraselvam
Using a soft chemical process that involves nitrates and heat annealing, nanoparticles of undoped ZnO and praseodymium, aluminum-codoped ZnO may be produced. XRD, SEM with EDS, and FTIR analysis determine nanocatalyst structures, morphologies, and chemical bonding. PL and UV spectroscopy examines optical characteristics. The peak in the FTIR spectral line at 714 cm-1 in the study indicates M-O stretching in the samples and ZnO's interaction with the Pr and Al matrix. XRD patterns indicated prepared nanoparticles with nanosizes ranging from 40.07 to 38.65 to 36.84 to 38.87 to 39.91 nm. SEM analyzed nanoparticle size, shape, and interaction with the Pr and Al matrix. EDS determined NPs purity. UV-vis spectra of ZnO-Pr/Al nanocomposites showed UV absorption similar to ZnO nanoparticles. Doping ZnO with Pr and Al shrinks the bandgap and slows photogenerated electron-hole pair recombination without changing its crystalline structure.
{"title":"Structural, morphological, and optical properties of praseodymium and aluminium codoped ZnO nanoparticles","authors":"M. S. Viswaksenan, A. Simi, A. Panneeraselvam","doi":"10.15251/jor.2023.194.351","DOIUrl":"https://doi.org/10.15251/jor.2023.194.351","url":null,"abstract":"Using a soft chemical process that involves nitrates and heat annealing, nanoparticles of undoped ZnO and praseodymium, aluminum-codoped ZnO may be produced. XRD, SEM with EDS, and FTIR analysis determine nanocatalyst structures, morphologies, and chemical bonding. PL and UV spectroscopy examines optical characteristics. The peak in the FTIR spectral line at 714 cm-1 in the study indicates M-O stretching in the samples and ZnO's interaction with the Pr and Al matrix. XRD patterns indicated prepared nanoparticles with nanosizes ranging from 40.07 to 38.65 to 36.84 to 38.87 to 39.91 nm. SEM analyzed nanoparticle size, shape, and interaction with the Pr and Al matrix. EDS determined NPs purity. UV-vis spectra of ZnO-Pr/Al nanocomposites showed UV absorption similar to ZnO nanoparticles. Doping ZnO with Pr and Al shrinks the bandgap and slows photogenerated electron-hole pair recombination without changing its crystalline structure.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44533435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-05DOI: 10.15251/jor.2023.193.345
H. Aissania, K. Hami, A. Talhi
The ion implantation method is one of the techniques used to dope the materials. The TRIM software (Transport and Range of Ions in Mater) created by Ziegler and colleagues [1] can simulate it. In this work, we studied the effect of incidence angles for different energies on the distribution of implant ions in the target by using the TRIM software, and several processes resulting from the interaction between Potassium ions and the target atoms are examined. Simulated physical effects are intriguing.
{"title":"Study effect of incidence angle on ion implantation in ZnO matrix","authors":"H. Aissania, K. Hami, A. Talhi","doi":"10.15251/jor.2023.193.345","DOIUrl":"https://doi.org/10.15251/jor.2023.193.345","url":null,"abstract":"The ion implantation method is one of the techniques used to dope the materials. The TRIM software (Transport and Range of Ions in Mater) created by Ziegler and colleagues [1] can simulate it. In this work, we studied the effect of incidence angles for different energies on the distribution of implant ions in the target by using the TRIM software, and several processes resulting from the interaction between Potassium ions and the target atoms are examined. Simulated physical effects are intriguing.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45504919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.15251/jor.2023.194.369
N. Alouche, B. Boudjema, R. Daira, M. Abdelkader
In this work, we have developed thin layers of CuO by method of pyrolysis spray. The samples developed are obtained from the use of copper chloride precursor CuCl2 with molarity of 0.1 mol/l and a spray number that varies between 25 to 150 spray with a step of 25 spray to see the effect of this parameter on the structural, optical and electrical properties of our material. The structural characterization of the obtained thin layers was done by X-ray diffraction (XDR) and spectroscopy Raman. The optical characterization was done by UV visible spectroscopy and electrical characterization by four points. The XDR has confirmed the crystalline state of our thin layers and the formation of the CuO with a preferential direction according to the plan (002). The Raman spectroscopy allowed us to confirm the presence of a thin layer based on the CuO. The lattice parameters remain mainly constant. The spectra UV visible of films has given a transmission varies between 80% and 40% in visible. The optical gap determined varies between 1.75 eV and 1.2 eV. Electrical characterization shows that the resistivity varied between 3.21KΩ.cm and 1.7KΩ.cm depending on number of spray for ethanol gas sensing applications.
{"title":"Structural, optical and electrical properties of copper oxide thin films deposited by spray pyrolysis","authors":"N. Alouche, B. Boudjema, R. Daira, M. Abdelkader","doi":"10.15251/jor.2023.194.369","DOIUrl":"https://doi.org/10.15251/jor.2023.194.369","url":null,"abstract":"In this work, we have developed thin layers of CuO by method of pyrolysis spray. The samples developed are obtained from the use of copper chloride precursor CuCl2 with molarity of 0.1 mol/l and a spray number that varies between 25 to 150 spray with a step of 25 spray to see the effect of this parameter on the structural, optical and electrical properties of our material. The structural characterization of the obtained thin layers was done by X-ray diffraction (XDR) and spectroscopy Raman. The optical characterization was done by UV visible spectroscopy and electrical characterization by four points. The XDR has confirmed the crystalline state of our thin layers and the formation of the CuO with a preferential direction according to the plan (002). The Raman spectroscopy allowed us to confirm the presence of a thin layer based on the CuO. The lattice parameters remain mainly constant. The spectra UV visible of films has given a transmission varies between 80% and 40% in visible. The optical gap determined varies between 1.75 eV and 1.2 eV. Electrical characterization shows that the resistivity varied between 3.21KΩ.cm and 1.7KΩ.cm depending on number of spray for ethanol gas sensing applications.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44231274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.15251/jor.2023.194.379
H. A. Gatea, S. Shoja, H. J. Albazoni
The sol-gel process was utilized in the production of the ferroelectric material Ba0.7Sr0.3TiO3. Barium and strontium acetate were employed as sources for Ba and Sr, respectively, and Ti(IV) isopropoxide was used as a source for Ti. The acetic acid was utilized as a solvent for Ba and Sr acetate, whereas 2-methoxy ethanol was used as a stabilizer for Ti (IV) isopropoxide. The effect of high temperatures on electrical and structural were studied. The FESEM revealed the particle size of all samples with different temperatures. The XRD shows the Ba0.7Sr0.3TiO3 samples have a tetragonal phase for all temperatures (1000, 1100, 1200˚C). The high temperatures impacted tetragonality and the lattice constant (a, c); the lattice constant decreased at higher temperatures. The ferroelectric sample sintered at 1000 degrees Celsius had dielectric characteristics that were inferior to those of the Ba0.7Sr0.3TiO3sample sintered at 1100 and 1200ºC degrees Celsius. When the dielectric constant was graphed as a function of temperature, the Curie temperature appeared to be between (28-32) degrees Celsius.
{"title":"Influence of heat-treatment temperature on structural and electrical properties for BaSrTiO3 compounds","authors":"H. A. Gatea, S. Shoja, H. J. Albazoni","doi":"10.15251/jor.2023.194.379","DOIUrl":"https://doi.org/10.15251/jor.2023.194.379","url":null,"abstract":"The sol-gel process was utilized in the production of the ferroelectric material Ba0.7Sr0.3TiO3. Barium and strontium acetate were employed as sources for Ba and Sr, respectively, and Ti(IV) isopropoxide was used as a source for Ti. The acetic acid was utilized as a solvent for Ba and Sr acetate, whereas 2-methoxy ethanol was used as a stabilizer for Ti (IV) isopropoxide. The effect of high temperatures on electrical and structural were studied. The FESEM revealed the particle size of all samples with different temperatures. The XRD shows the Ba0.7Sr0.3TiO3 samples have a tetragonal phase for all temperatures (1000, 1100, 1200˚C). The high temperatures impacted tetragonality and the lattice constant (a, c); the lattice constant decreased at higher temperatures. The ferroelectric sample sintered at 1000 degrees Celsius had dielectric characteristics that were inferior to those of the Ba0.7Sr0.3TiO3sample sintered at 1100 and 1200ºC degrees Celsius. When the dielectric constant was graphed as a function of temperature, the Curie temperature appeared to be between (28-32) degrees Celsius.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42644450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.15251/jor.2023.194.359
S. M. Al-Begg, S. H. Saeed, A. Al-Rawas
An alpha particle-irradiated MIS device made of AuTa2O5GaAs was used to study how thermal annealing affects the I-V characteristics and how the current changes with annealing temperature, radiation energy, and voltage biassing. The super-gate of the MIS structure was made by using thermal evaporation to build a 1000°A thick layer of gold under a vacuum of about 10-5 torr. At room temperature, the devices were exposed to alpha particles from the radioactive source 226Ra (0.5 Ci) with energies of 5.1, 4, 3, 1.8, and 1.2 MeV for 0–30 minutes. After 30 minutes of annealing at 150, 200, and 300 o C in a vacuum of 10-3 torr, the current-voltage (I-V) characteristics of the irradiation devices were found. During thermal annealing, different results were seen with bias voltages of 0.4, 1, and 2 V and temperatures of 150, 200, and 300 o C. Annealing the device at 150 o C doesn't change how stable it is, but annealing it at 300 o C causes ohmic conduction in the device's properties. The device's current can be fixed best when the device is heated to 200 o C and then cooled. Also, thermal annealing seems to have different effects on the I–V electrical characteristics of the devices depending on the energy of the particles and the voltage biassing.
{"title":"Thermal annealing effects on the electrical characteristics of alpha particles irradiated MIS device AuTa2O5GaAs","authors":"S. M. Al-Begg, S. H. Saeed, A. Al-Rawas","doi":"10.15251/jor.2023.194.359","DOIUrl":"https://doi.org/10.15251/jor.2023.194.359","url":null,"abstract":"An alpha particle-irradiated MIS device made of AuTa2O5GaAs was used to study how thermal annealing affects the I-V characteristics and how the current changes with annealing temperature, radiation energy, and voltage biassing. The super-gate of the MIS structure was made by using thermal evaporation to build a 1000°A thick layer of gold under a vacuum of about 10-5 torr. At room temperature, the devices were exposed to alpha particles from the radioactive source 226Ra (0.5 Ci) with energies of 5.1, 4, 3, 1.8, and 1.2 MeV for 0–30 minutes. After 30 minutes of annealing at 150, 200, and 300 o C in a vacuum of 10-3 torr, the current-voltage (I-V) characteristics of the irradiation devices were found. During thermal annealing, different results were seen with bias voltages of 0.4, 1, and 2 V and temperatures of 150, 200, and 300 o C. Annealing the device at 150 o C doesn't change how stable it is, but annealing it at 300 o C causes ohmic conduction in the device's properties. The device's current can be fixed best when the device is heated to 200 o C and then cooled. Also, thermal annealing seems to have different effects on the I–V electrical characteristics of the devices depending on the energy of the particles and the voltage biassing.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47687276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.15251/jor.2023.193.239
A. Mahmoud, E. Ibrahim, L. Galal, E. R. Shaaban, E. Yousef
Zn1-xFexO films with x = 0, 5, 10, 15 and 20 at.% were prepared under high vacuum by the electron beam gun evaporation. The impact of Fe doping concentration on the films' structural, optical and magnetic characteristics has been taken into account. The patterns of XRD for all films at various Fe concentrations showed wurtzite-type structures. The results show that the size of nano-films reduces from 24 nm (0%) to 11 nm (0.20%) with elevating Fe content, which is owing to the difference between the ionic radii of Zn and Fe. Peaks associated with the elements to be seen were visible in the XPS spectra of undoped and 10% Fe-doped ZnO nanoparticles produced by the precipitation process: zinc (Zn), iron (Fe), and oxygen (O). The optical constants (n, k) of the Zn1-xFexO films were obtained by the SE measurements by an ellipsometric model, allowing for the verification of the Fe3+ ions in Fe-doped ZnO. With the addition of Fe, the energy band gap decreased from 3.44 eV to 3.28 eV. M-H measurements revealed room-temperature ferromagnetism in Fe-doped ZnO thin film. As the Fe concentration rises, the magnetization increases until it reaches a concentration of 15%, at which point it starts to decrease. This decrease in magnetization was attributable to the spinel phase, which was seen in the XRD spectra. These findings imply that Fe-doped ZnO is a highly suggested material for the creation of spintronic and optoelectronic devices.
x = 0、5、10、15和20 at的Zn1-xFexO薄膜。%是在高真空条件下用电子束枪蒸发法制得的。考虑了Fe掺杂浓度对薄膜结构、光学和磁性的影响。在不同铁浓度下，所有薄膜的XRD谱图均表现为纤锌矿型结构。结果表明:随着Fe含量的增加，纳米膜的尺寸从24 nm(0%)减小到11 nm(0.20%)，这是由于Zn和Fe离子半径的差异所致;在沉淀过程中制备的未掺杂和掺铁10%的ZnO纳米粒子的XPS光谱中可以看到与所要看到的元素相关的峰:锌(Zn)，铁(Fe)和氧(O)。通过椭偏模型的SE测量获得了Zn1-xFexO薄膜的光学常数(n, k)，从而验证了铁掺杂ZnO中的Fe3+离子。随着Fe的加入，能带隙从3.44 eV减小到3.28 eV。M-H测量揭示了fe掺杂ZnO薄膜的室温铁磁性。随着铁浓度的增加，磁化强度增加，直到铁浓度达到15%，这时磁化强度开始下降。这种磁化强度的降低是由于尖晶石相的存在，这在XRD光谱中可以看出。这些发现表明，铁掺杂ZnO是一种非常理想的自旋电子和光电子器件材料。
{"title":"Structural, optical and magnetic characteristics of iron doped zinc oxide thin films","authors":"A. Mahmoud, E. Ibrahim, L. Galal, E. R. Shaaban, E. Yousef","doi":"10.15251/jor.2023.193.239","DOIUrl":"https://doi.org/10.15251/jor.2023.193.239","url":null,"abstract":"Zn1-xFexO films with x = 0, 5, 10, 15 and 20 at.% were prepared under high vacuum by the electron beam gun evaporation. The impact of Fe doping concentration on the films' structural, optical and magnetic characteristics has been taken into account. The patterns of XRD for all films at various Fe concentrations showed wurtzite-type structures. The results show that the size of nano-films reduces from 24 nm (0%) to 11 nm (0.20%) with elevating Fe content, which is owing to the difference between the ionic radii of Zn and Fe. Peaks associated with the elements to be seen were visible in the XPS spectra of undoped and 10% Fe-doped ZnO nanoparticles produced by the precipitation process: zinc (Zn), iron (Fe), and oxygen (O). The optical constants (n, k) of the Zn1-xFexO films were obtained by the SE measurements by an ellipsometric model, allowing for the verification of the Fe3+ ions in Fe-doped ZnO. With the addition of Fe, the energy band gap decreased from 3.44 eV to 3.28 eV. M-H measurements revealed room-temperature ferromagnetism in Fe-doped ZnO thin film. As the Fe concentration rises, the magnetization increases until it reaches a concentration of 15%, at which point it starts to decrease. This decrease in magnetization was attributable to the spinel phase, which was seen in the XRD spectra. These findings imply that Fe-doped ZnO is a highly suggested material for the creation of spintronic and optoelectronic devices.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44242219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.15251/jor.2023.193.253
A. Poongodi, N. Thangaraj
Fe-Mn-W thin films were synthesized by electrodeposition technique with different current density and different deposition time. Electrodeposition method is a flexible and less expensive avenue which produces alloys in controlled thickness, shapes and sizes. The hysteresis loops of Fe-Mn-W alloys films were studied by using vibrating sample magnetometer. The crystalline size and surface morphology of the deposited thin films were calculated by using X-ray diffraction (XRD) studies and Scanning Electron Microscope (SEM). Energy Dispersive X-ray Spectroscopy (EDAX) was used to identify the components of the films. Hardness and adhesion of the deposited thin films were investigated by Vickers hardness tester using diamond intender method.
{"title":"Synthesis and characterization of ferrous manganese tungsten thin films for magnetic MEMS devices","authors":"A. Poongodi, N. Thangaraj","doi":"10.15251/jor.2023.193.253","DOIUrl":"https://doi.org/10.15251/jor.2023.193.253","url":null,"abstract":"Fe-Mn-W thin films were synthesized by electrodeposition technique with different current density and different deposition time. Electrodeposition method is a flexible and less expensive avenue which produces alloys in controlled thickness, shapes and sizes. The hysteresis loops of Fe-Mn-W alloys films were studied by using vibrating sample magnetometer. The crystalline size and surface morphology of the deposited thin films were calculated by using X-ray diffraction (XRD) studies and Scanning Electron Microscope (SEM). Energy Dispersive X-ray Spectroscopy (EDAX) was used to identify the components of the films. Hardness and adhesion of the deposited thin films were investigated by Vickers hardness tester using diamond intender method.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48137915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.15251/jor.2023.193.259
R. G. Abaszadea, A. Mammadov, E. A. Khanmammadova, I. Bayramov, R. A. Namazov, Kh. M. Popal, S. Z. Melikova, R. C. Qasımov, M. Bayramov, N. Babayeva
The samples obtained by the Hammer method and then doped with 5, 10 and 15 percent gadolinium were studied by the EPR analysis method. The conducted studies were carried out at room temperature. Depending on the degree of addition of gadolinium during the studies an increase in the intensity of the signal and a decrease in the intensity of free radicals were observed. So that, when the amount of gadolinium reaches 15%, the signal of free radicals disappears. The reason for this is that the Gd ion forms a single homogeneous system with the formation of strong bonds between the surface of the graphene oxide sample. In addition, it can be noted that unpaired electrons in the form of free radicals, which are stabilized in the carbon rings in the crystal structure of graphene oxide, cause this connection.
{"title":"Electron paramagnetic resonance study of gadoliniumum doped graphene oxide","authors":"R. G. Abaszadea, A. Mammadov, E. A. Khanmammadova, I. Bayramov, R. A. Namazov, Kh. M. Popal, S. Z. Melikova, R. C. Qasımov, M. Bayramov, N. Babayeva","doi":"10.15251/jor.2023.193.259","DOIUrl":"https://doi.org/10.15251/jor.2023.193.259","url":null,"abstract":"The samples obtained by the Hammer method and then doped with 5, 10 and 15 percent gadolinium were studied by the EPR analysis method. The conducted studies were carried out at room temperature. Depending on the degree of addition of gadolinium during the studies an increase in the intensity of the signal and a decrease in the intensity of free radicals were observed. So that, when the amount of gadolinium reaches 15%, the signal of free radicals disappears. The reason for this is that the Gd ion forms a single homogeneous system with the formation of strong bonds between the surface of the graphene oxide sample. In addition, it can be noted that unpaired electrons in the form of free radicals, which are stabilized in the carbon rings in the crystal structure of graphene oxide, cause this connection.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47887066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-01DOI: 10.15251/jor.2023.192.219
R. Shlaga, A. Alwan, M. S. Mohammed
In this work, the morphological and plasmonic features of the AgNPs which formed by ion-reduction process was carried out extensively. The application of the laser beam during the ion- reduction process has significant effect in the reconstruction of the formed AgNPs with small dimensions and non-frequent morphologies, according to the laser illumination intensity. For non-illumination process the deposited form of the AgNPs appear aggregated into cluster of layer AgNPs size due to the chemical reaction at Si interface, the AgNPs sizes varied from 0.85 to1.2 µm; while at lower laser intensity of about 250 mW/cm2 the AgNPs sizes varied from 0.1 to 1.0 µm, while at high intensity upto 400 mW/cm2 the AgNPs sizes varied from 0.05 to 0.4 µm. The hot spot dimension for non-illumination process varied from 1 to 11 nm while at low intensity of 250 mW/cm2 the hot spot dimension varied from 1to 8 nm. At high intensity upto 400 mW/cm2 , the hot spot varied from 0.1 to 14 nm. The XRD for the generated Ag nanoparticles / Si nanocrystallites, for non- illumination the grain size about 6.171 nm and SSD about 92.687 m2 /g while at low intensity of 250 mW/cm2 the grain size about 4.759nm and SSD about 120.191 m2 /g. At high intensity of 350 mW/cm2 , the grain size about 2.037nm and SSD about 280.847m2 /g uniform distributed AgNPs with minimum hot spot regions can be realized with 350mW/cm2 laser illumination intensity. This process is considerable as a novel work which can be adopted modification at the plasmonic features of metallic nanoparticles for SERs application.
{"title":"Novel controlling pathway for metallic nanoparticles by laser assisted ion-reduction process","authors":"R. Shlaga, A. Alwan, M. S. Mohammed","doi":"10.15251/jor.2023.192.219","DOIUrl":"https://doi.org/10.15251/jor.2023.192.219","url":null,"abstract":"In this work, the morphological and plasmonic features of the AgNPs which formed by ion-reduction process was carried out extensively. The application of the laser beam during the ion- reduction process has significant effect in the reconstruction of the formed AgNPs with small dimensions and non-frequent morphologies, according to the laser illumination intensity. For non-illumination process the deposited form of the AgNPs appear aggregated into cluster of layer AgNPs size due to the chemical reaction at Si interface, the AgNPs sizes varied from 0.85 to1.2 µm; while at lower laser intensity of about 250 mW/cm2 the AgNPs sizes varied from 0.1 to 1.0 µm, while at high intensity upto 400 mW/cm2 the AgNPs sizes varied from 0.05 to 0.4 µm. The hot spot dimension for non-illumination process varied from 1 to 11 nm while at low intensity of 250 mW/cm2 the hot spot dimension varied from 1to 8 nm. At high intensity upto 400 mW/cm2 , the hot spot varied from 0.1 to 14 nm. The XRD for the generated Ag nanoparticles / Si nanocrystallites, for non- illumination the grain size about 6.171 nm and SSD about 92.687 m2 /g while at low intensity of 250 mW/cm2 the grain size about 4.759nm and SSD about 120.191 m2 /g. At high intensity of 350 mW/cm2 , the grain size about 2.037nm and SSD about 280.847m2 /g uniform distributed AgNPs with minimum hot spot regions can be realized with 350mW/cm2 laser illumination intensity. This process is considerable as a novel work which can be adopted modification at the plasmonic features of metallic nanoparticles for SERs application.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42552321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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