Pub Date : 2022-07-29DOI: 10.1051/epjap/2022220183
Wen-jing Liu, Jianrong Deng, Dan Zhang, Lijuan Huang, Zhengrui Hu, Shuren Zhou, Hong Zhang, Lijuan Ye, Yuanqiang Xiong, C. Kong, Honglin Li, Wanjun Li
Gallium oxide-based photoelectrochemical photodetectors (PEC-PDs) have received extensive attention due to their natural self-powered characteristic and detection capability in solar-blind region. In this work, α-Ga2O3 nanorods-ZnO nanoparticles heterojunction (α-Ga2O3-ZnO) are constructed on FTO conductive glass substrates as photoanodes for PEC-PDs. The efficient regulation of performance for α-Ga2O3-ZnO heterojunction PEC-PDs is achieved by varying the ZnO nanoparticles concentration. Experimental results show that all devices exhibit self-powered solar blind detection characteristics and the performance of devices prepared by α-Ga2O3-ZnO heterojunction is better than that of pristine α-Ga2O3. When the concentration of ZnO nanoparticles reaches to a certain value, the responsivity shows the maximum value as high as 32 mA/W, and the response time is as low as 0.25/0.18 s. Combined with first-principles calculations, the mechanism of the improved performance is discuss in detail. The results reveal that that the contact between α-Ga2O3 and ZnO can induce charges transfer, which constitutes a built-in electric field that acts as a driving force to separate the photogenerated carriers into different sections. This process can effectively prevent the recombination of photogenerated carriers, and prolong the lifetime of e--h+, thus improve the overall detection performance finally. This work will provide meaningful guidance for the development of novel high-performance self-powered solar-blind deep-UV photodetectors.
{"title":"Construction of α-Ga2O3-ZnO heterojunction for a promoted performance applied in self-powered solar blind photodetector","authors":"Wen-jing Liu, Jianrong Deng, Dan Zhang, Lijuan Huang, Zhengrui Hu, Shuren Zhou, Hong Zhang, Lijuan Ye, Yuanqiang Xiong, C. Kong, Honglin Li, Wanjun Li","doi":"10.1051/epjap/2022220183","DOIUrl":"https://doi.org/10.1051/epjap/2022220183","url":null,"abstract":"Gallium oxide-based photoelectrochemical photodetectors (PEC-PDs) have received extensive attention due to their natural self-powered characteristic and detection capability in solar-blind region. In this work, α-Ga2O3 nanorods-ZnO nanoparticles heterojunction (α-Ga2O3-ZnO) are constructed on FTO conductive glass substrates as photoanodes for PEC-PDs. The efficient regulation of performance for α-Ga2O3-ZnO heterojunction PEC-PDs is achieved by varying the ZnO nanoparticles concentration. Experimental results show that all devices exhibit self-powered solar blind detection characteristics and the performance of devices prepared by α-Ga2O3-ZnO heterojunction is better than that of pristine α-Ga2O3. When the concentration of ZnO nanoparticles reaches to a certain value, the responsivity shows the maximum value as high as 32 mA/W, and the response time is as low as 0.25/0.18 s. Combined with first-principles calculations, the mechanism of the improved performance is discuss in detail. The results reveal that that the contact between α-Ga2O3 and ZnO can induce charges transfer, which constitutes a built-in electric field that acts as a driving force to separate the photogenerated carriers into different sections. This process can effectively prevent the recombination of photogenerated carriers, and prolong the lifetime of e--h+, thus improve the overall detection performance finally. This work will provide meaningful guidance for the development of novel high-performance self-powered solar-blind deep-UV photodetectors.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129944948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-25DOI: 10.1051/epjap/2022220091
A. Rjafallah, Y. Tabbai, A. Hajjaji, C. Ennawaoui
The piezo-ceramics have been using in many piezoelectric applications such as transducers, sensors and actuators. Under high mechanical and electrical strengths, the nonlinear behavior observed on these devices can describe by the second order piezoelectric constitutive equations. However, their hysteretic behavior cannot be described by these equations. In this paper, a more general theoretical model was developed to describe the nonlinear and hysteretic behaviors of the piezo-ceramics under high electrical and mechanical strengths. The model, based on the theory of Landau-Devonshire, can simulate the hysteresis cycles under the combined cyclic electric and static mechanical strengths. It can describe the evolution of the relative dielectric permittivity ε33 as a function of the applied electric field. Using the scaling law, it can also describe the evolution of the piezoelectric coefficient d33 as a function of the applied electric field.
{"title":"Modeling of nonlinear and hysteretic behaviors in the ferroelectric materials under strong electrical and mechanical driving levels","authors":"A. Rjafallah, Y. Tabbai, A. Hajjaji, C. Ennawaoui","doi":"10.1051/epjap/2022220091","DOIUrl":"https://doi.org/10.1051/epjap/2022220091","url":null,"abstract":"The piezo-ceramics have been using in many piezoelectric applications such as transducers, sensors and actuators. Under high mechanical and electrical strengths, the nonlinear behavior observed on these devices can describe by the second order piezoelectric constitutive equations. However, their hysteretic behavior cannot be described by these equations. In this paper, a more general theoretical model was developed to describe the nonlinear and hysteretic behaviors of the piezo-ceramics under high electrical and mechanical strengths. The model, based on the theory of Landau-Devonshire, can simulate the hysteresis cycles under the combined cyclic electric and static mechanical strengths. It can describe the evolution of the relative dielectric permittivity ε33 as a function of the applied electric field. Using the scaling law, it can also describe the evolution of the piezoelectric coefficient d33 as a function of the applied electric field.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"110 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124118316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-20DOI: 10.1051/epjap/2022220055
Jingyun Zhang, Yufeng Su
This paper proposes a set of energy harvesting structure that can effectively generate electrical power. Diamagnetic levitation structure is reported, with a floating magnet rotor levitated between two pyrolytic graphite plates just using a lifting magnet and airflow. The magnet rotor could be stably suspended under joint action of magnetic forces and diamagnetic forces, being driven to rotate by airflow. Three magnet rotors, with 1.5 mm, 3 mm and 4.5 mm thickness respectively, were adopted in the study so as to investigate the influence of structural parameters of the magnet rotor on the performance of the harvester. Simulation and experiment were carried out for the three magnet rotors. Among the tree magnet rotros, the 1.5mm-thick one has the best output performance , with the lowest dynamic stability. Therefore, the energy harvester is to find tradeoff between output characteristics and dynamics. In this work, it was discovered that the peak output voltage of the energy harvester increased with the square of flowrate. As the flowrate increased to 3000 sccm, the 1.5mm-thick rotor was rotating at a speed of 19729 rpm under standard temperature and pressure, with 1.255V output voltage and 98mW power. The diamagnetic levitation structure is expected to be applied to sensing, energy harvesting and air bearing under actuation of airflow due to its advantages of low friction, high rotation speed and large levitation space.
{"title":"Analysis and Experiment of an Airflow Energy Harvester based on Diamagnetic Levitation","authors":"Jingyun Zhang, Yufeng Su","doi":"10.1051/epjap/2022220055","DOIUrl":"https://doi.org/10.1051/epjap/2022220055","url":null,"abstract":"This paper proposes a set of energy harvesting structure that can effectively generate electrical power. Diamagnetic levitation structure is reported, with a floating magnet rotor levitated between two pyrolytic graphite plates just using a lifting magnet and airflow. The magnet rotor could be stably suspended under joint action of magnetic forces and diamagnetic forces, being driven to rotate by airflow. Three magnet rotors, with 1.5 mm, 3 mm and 4.5 mm thickness respectively, were adopted in the study so as to investigate the influence of structural parameters of the magnet rotor on the performance of the harvester. Simulation and experiment were carried out for the three magnet rotors. Among the tree magnet rotros, the 1.5mm-thick one has the best output performance , with the lowest dynamic stability. Therefore, the energy harvester is to find tradeoff between output characteristics and dynamics. In this work, it was discovered that the peak output voltage of the energy harvester increased with the square of flowrate. As the flowrate increased to 3000 sccm, the 1.5mm-thick rotor was rotating at a speed of 19729 rpm under standard temperature and pressure, with 1.255V output voltage and 98mW power. The diamagnetic levitation structure is expected to be applied to sensing, energy harvesting and air bearing under actuation of airflow due to its advantages of low friction, high rotation speed and large levitation space.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126199006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-19DOI: 10.1051/epjap/2022220076
Xue Zhou, Haiwei Li, Peng Hu
Integrating cavities are commonly used in trace gas detection and weak absorption measurement. Effective optical path length (EOPL) is an important index to evaluate the ability of increasing optical path length for an integrating cavity. The EOPL has been studied to be related to inner surface reflectivity, cavity shape and dimension, port fraction. For different spectroscopic techniques, whether the EOPL variation tendency is universally valid is investigated in this work. The EOPLs of a cubic integrating cavity in different port fractions have been measured using time-resolved spectroscopy and tunable diode laser absorption spectroscopy (TDLAS) respectively. With the increasing of the port fraction, the EOPL reduces gradually. However, measured EOPL results shows a deviation between the two technique methods. By analyzing, the deviation is caused by a reflectivity difference of the inner coating at different laser wavelength for the two spectral methods. By introduction of the reflectivity correction, the deviation could be eliminated. This demonstrates that EOPL extending law of integrating cavity was universally valid in different spectroscopy application.
{"title":"Effective optical path length measurement of integrating cavity using time-resolved spectroscopy and tunable diode laser absorption \u0000spectroscopy","authors":"Xue Zhou, Haiwei Li, Peng Hu","doi":"10.1051/epjap/2022220076","DOIUrl":"https://doi.org/10.1051/epjap/2022220076","url":null,"abstract":"Integrating cavities are commonly used in trace gas detection and weak absorption measurement. Effective optical path length (EOPL) is an important index to evaluate the ability of increasing optical path length for an integrating cavity. The EOPL has been studied to be related to inner surface reflectivity, cavity shape and dimension, port fraction. For different spectroscopic techniques, whether the EOPL variation tendency is universally valid is investigated in this work. The EOPLs of a cubic integrating cavity in different port fractions have been measured using time-resolved spectroscopy and tunable diode laser absorption spectroscopy (TDLAS) respectively. With the increasing of the port fraction, the EOPL reduces gradually. However, measured EOPL results shows a deviation between the two technique methods. By analyzing, the deviation is caused by a reflectivity difference of the inner coating at different laser wavelength for the two spectral methods. By introduction of the reflectivity correction, the deviation could be eliminated. This demonstrates that EOPL extending law of integrating cavity was universally valid in different spectroscopy application.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114819464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-19DOI: 10.1051/epjap/2022220062
Wafaa Zibar, O. Richard, A. Drighil, T. Lachhab, Hasna Mziouek, V. Aimez, Abdellatif Jaouad, Rhma Adhiri
This paper presents a study on the fabrication and optimization of GaAs metal-insulator-semiconductor (MIS) structures, comprising Si3N4 as insulator deposited by the PECVD technique. In the RF plasma, the excitation frequencies used, are 380 KHz for the low frequency and 13.56 MHz for the higher frequency. Thanks to the established protocol, it was possible to develop several structures on n-GaAs substrate, to study effect of the surface treatment with sulfur, the deposition of the insulator by PECVD at low and high frequency, as well as the annealing of these structures. Detailed measurements of the capacitance-voltage and conductance-voltage characteristics of the MIS capacity revealed various anomalies. So, the interface properties the structures (MIS) of semiconductor GaAs with insulation metallic have been investigated. The growth of the Si3N4 layer by LF-PECVD on GaAs substrate treated with sulfur has an effect on the electrical properties of the MIS capacitys studied, leading to good capacitance-voltage (C-V) characteristics. The LF-PECVD was also effective in reducing the frequency dispersion, thus suggesting the removal of traps in n-GaAs located near the dielectric/GaAs interface. In contrast, the Si3N4 layer deposited by HF-PECVD method seems to increase the interfacial density of states near the mid-gap leading to a pinning of the Fermi level. At room temperature of measurement, a hysteresis effect was observed showing injection type effect.
{"title":"Study of Electrical Properties of Al/Si3N4/n-GaAs MIS capacitors deposited at low and high frequency PECVD","authors":"Wafaa Zibar, O. Richard, A. Drighil, T. Lachhab, Hasna Mziouek, V. Aimez, Abdellatif Jaouad, Rhma Adhiri","doi":"10.1051/epjap/2022220062","DOIUrl":"https://doi.org/10.1051/epjap/2022220062","url":null,"abstract":"This paper presents a study on the fabrication and optimization of GaAs metal-insulator-semiconductor (MIS) structures, comprising Si3N4 as insulator deposited by the PECVD technique. In the RF plasma, the excitation frequencies used, are 380 KHz for the low frequency and 13.56 MHz for the higher frequency. Thanks to the established protocol, it was possible to develop several structures on n-GaAs substrate, to study effect of the surface treatment with sulfur, the deposition of the insulator by PECVD at low and high frequency, as well as the annealing of these structures. Detailed measurements of the capacitance-voltage and conductance-voltage characteristics of the MIS capacity revealed various anomalies. So, the interface properties the structures (MIS) of semiconductor GaAs with insulation metallic have been investigated. The growth of the Si3N4 layer by LF-PECVD on GaAs substrate treated with sulfur has an effect on the electrical properties of the MIS capacitys studied, leading to good capacitance-voltage (C-V) characteristics. The LF-PECVD was also effective in reducing the frequency dispersion, thus suggesting the removal of traps in n-GaAs located near the dielectric/GaAs interface. In contrast, the Si3N4 layer deposited by HF-PECVD method seems to increase the interfacial density of states near the mid-gap leading to a pinning of the Fermi level. At room temperature of measurement, a hysteresis effect was observed showing injection type effect.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"50 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134333103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Organic solar cells have been fabricated using cathode modifying layers of thermally evaporated bathophenanthroline (Bphen), ytterbium doped Bphen (Bphen:Yb), and solution processed (N,N-dimethyl-ammonium N-oxide)propyl perylene diimide (PDINO). Compared to pristine Bphen, Bphen:Yb shows higher electron mobility and thereby increases fill factor of device, demonstrating the weak n-doping of Yb in Bphen. As a result of Fermi level pinning, Bphen:Yb forms an ohmic contact with photoactive layer, underpinning efficient electron transport and extraction of device. Compared to conventional PDINO, despite lower electron mobility, Bphen:Yb enables increased optical absorption of device and smoother morphology of device, thereby improving power conversion efficiency of device. The current research points out that the integration of thermally evaporated weakly n-doped cathode modifying layer and solution processed photoactive layer is a promising method to fabricate high-efficiency and low-cost organic solar cells.
{"title":"Comparative study on thermally evaporated and solution processed cathode modifying layers in organic solar cells","authors":"Shang Feng, Zichen Liu, Hailiang Zhao, Qingqing Yang, Jidong Zhang, D. Qin","doi":"10.1051/epjap/2022220143","DOIUrl":"https://doi.org/10.1051/epjap/2022220143","url":null,"abstract":"Organic solar cells have been fabricated using cathode modifying layers of thermally evaporated bathophenanthroline (Bphen), ytterbium doped Bphen (Bphen:Yb), and solution processed (N,N-dimethyl-ammonium N-oxide)propyl perylene diimide (PDINO). Compared to pristine Bphen, Bphen:Yb shows higher electron mobility and thereby increases fill factor of device, demonstrating the weak n-doping of Yb in Bphen. As a result of Fermi level pinning, Bphen:Yb forms an ohmic contact with photoactive layer, underpinning efficient electron transport and extraction of device. Compared to conventional PDINO, despite lower electron mobility, Bphen:Yb enables increased optical absorption of device and smoother morphology of device, thereby improving power conversion efficiency of device. The current research points out that the integration of thermally evaporated weakly n-doped cathode modifying layer and solution processed photoactive layer is a promising method to fabricate high-efficiency and low-cost organic solar cells.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129096202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-06DOI: 10.1051/epjap/2022220065
L. Nkhaili, A. El kissani, C. Liang, C. Naceur Abouloula, S. Hnawi, M. Ait Ali, A. Narjis, A. Outzourhit
The use of natural dyes as sensitizers in organic solar cells is getting more interest due to its green nature, nontoxicity, low cost and ecofriendly materials. In this paper, two antraquinone/zinc oxide-based dye-sensitized solar cells (DSSCs) were prepared by a simple and low cost method. The anthraquinone was extracted from Aloe-vera plant and was deposited as a thin film to study its structural and optical properties. ZnO nanoparticles and nanorods were prepared by the RF sputtering and electrodeposition methods, respectively.Glass/ITO/ZnO/anthraquinone/Al cell gave a remarkable photovoltaic activity.
{"title":"Fabrication and Characterization of ITO/ZnO/Anthraquinone solid Dye-Sensitized Solar Cells","authors":"L. Nkhaili, A. El kissani, C. Liang, C. Naceur Abouloula, S. Hnawi, M. Ait Ali, A. Narjis, A. Outzourhit","doi":"10.1051/epjap/2022220065","DOIUrl":"https://doi.org/10.1051/epjap/2022220065","url":null,"abstract":"The use of natural dyes as sensitizers in organic solar cells is getting more interest due to its green nature, nontoxicity, low cost and ecofriendly materials. In this paper, two antraquinone/zinc oxide-based dye-sensitized solar cells (DSSCs) were prepared by a simple and low cost method. The anthraquinone was extracted from Aloe-vera plant and was deposited as a thin film to study its structural and optical properties. ZnO nanoparticles and nanorods were prepared by the RF sputtering and electrodeposition methods, respectively.Glass/ITO/ZnO/anthraquinone/Al cell gave a remarkable photovoltaic activity.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128576501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-06DOI: 10.1051/epjap/2022220104
Penpen Komgue Lucrece Barbara, S. Assif, A. Faiz, C. Ennawaoui, J. Ducourneau, A. Hajjaji
Personal Ear Protection (PEP) is a device designed to reduce the effects of ambient noise on humans, thus limiting the risk of hearing damage. This damage mainly affects the entire auditory chain (from the tympanic membrane to the cochlea). The aim of this work is to carry out a study of the mechanical properties of the PEP studied to model it subsequently using the finite elements method (FEM). To this end, the aim of this paper will be the study of the morphological and mechanical performance of porous polymers to protect the human ear from vibrations. The influence of air content (Porosity rate, pore size and shape) on the elastic matrix and mechanical properties of porous polymers (Young's modulus and Poisson's ratio) produced from available commercial Polyurethane (PU) and Polyvinyl-Chloride (PVC) were examined and discussed. The authors present a mathematical model that is able to predict the Young’s modulus of porous polymers as a function of matrix characteristics, mechanical excitation and porosity percentage. Porosimeter, Scanning Electron Microscope (SEM) and Light Microscope (LM) techniques are used for morphological characterizations. PU and PVC earplugs are effective for sound reduction, so they can be used for other applications.
{"title":"Characterization of Earplugs based on Porous Polyurethane (PU) and Polyvinyl-Chloride (PVC) Polymers for Human Ear Protection","authors":"Penpen Komgue Lucrece Barbara, S. Assif, A. Faiz, C. Ennawaoui, J. Ducourneau, A. Hajjaji","doi":"10.1051/epjap/2022220104","DOIUrl":"https://doi.org/10.1051/epjap/2022220104","url":null,"abstract":"Personal Ear Protection (PEP) is a device designed to reduce the effects of ambient noise on humans, thus limiting the risk of hearing damage. This damage mainly affects the entire auditory chain (from the tympanic membrane to the cochlea). The aim of this work is to carry out a study of the mechanical properties of the PEP studied to model it subsequently using the finite elements method (FEM). To this end, the aim of this paper will be the study of the morphological and mechanical performance of porous polymers to protect the human ear from vibrations. The influence of air content (Porosity rate, pore size and shape) on the elastic matrix and mechanical properties of porous polymers (Young's modulus and Poisson's ratio) produced from available commercial Polyurethane (PU) and Polyvinyl-Chloride (PVC) were examined and discussed. The authors present a mathematical model that is able to predict the Young’s modulus of porous polymers as a function of matrix characteristics, mechanical excitation and porosity percentage. Porosimeter, Scanning Electron Microscope (SEM) and Light Microscope (LM) techniques are used for morphological characterizations. PU and PVC earplugs are effective for sound reduction, so they can be used for other applications.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130000136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-01DOI: 10.1051/epjap/2022220138
M. Laourayed, Y. Alaoui, A. Er-rafai, M. El Mouzahim, M. El Moudane, M. Abid, Mestapha Beraich, A. Guenbour, A. Bellaouchou
Glass with 5Ta2O5, xBi2O3, (95–x)P2O5 for 10≤ x ≤ 20 mol % formula was obtained by the normal melt-quench technique and identified by DRX, DSC analysis, Infrared spectroscopy, and followed by the study of the dielectric and optical properties. Glass transition temperature (Tg) is found to grow linearlywith bismuth oxide concentration and goes from 524°C for x=10 to 582°C for x=20 mol %. The density ρ increases with increasing Bi2O3 content and molar volume (VM) diminish when Bi2O3 content rises. The IR study shows the presence of BiO6 and PO3 structural groups and reveals depolymerization of the phosphate links by the creation of the Bi–O–P groups which are due to the incorporation of Bi–O bonds. The partial replacement of P2O5 by Bi2O3 shows that the variation of ɛr' and tan δ depend on Bi2O3 contents. By UV absorption, optical properties of glasses were found in the wavelength limit from 250 to 800nm. The energy band gap was calculated using the optical absorption spectrum and was interpreted as a reflection of the structural changes that take place in the glasses as the Bi2O3 content increases.
{"title":"Structural, dielectric and optical properties of Ta2O5-Bi2O3-P2O5 phosphate glasses","authors":"M. Laourayed, Y. Alaoui, A. Er-rafai, M. El Mouzahim, M. El Moudane, M. Abid, Mestapha Beraich, A. Guenbour, A. Bellaouchou","doi":"10.1051/epjap/2022220138","DOIUrl":"https://doi.org/10.1051/epjap/2022220138","url":null,"abstract":"Glass with 5Ta2O5, xBi2O3, (95–x)P2O5 for 10≤ x ≤ 20 mol % formula was obtained by the normal melt-quench technique and identified by DRX, DSC analysis, Infrared spectroscopy, and followed by the study of the dielectric and optical properties. Glass transition temperature (Tg) is found to grow linearlywith bismuth oxide concentration and goes from 524°C for x=10 to 582°C for x=20 mol %. The density ρ increases with increasing Bi2O3 content and molar volume (VM) diminish when Bi2O3 content rises. The IR study shows the presence of BiO6 and PO3 structural groups and reveals depolymerization of the phosphate links by the creation of the Bi–O–P groups which are due to the incorporation of Bi–O bonds. The partial replacement of P2O5 by Bi2O3 shows that the variation of ɛr' and tan δ depend on Bi2O3 contents. By UV absorption, optical properties of glasses were found in the wavelength limit from 250 to 800nm. The energy band gap was calculated using the optical absorption spectrum and was interpreted as a reflection of the structural changes that take place in the glasses as the Bi2O3 content increases.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121173761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-01DOI: 10.1051/epjap/2022220043
A. Dakhel
Anatase (TiO2) ceramic nanoparticle (NPs) powder doped with Bi/Li ions was synthesized by a facial precipitation method. The structural, optical, and electrical properties of the NP powders were studied by X‐Ray diffraction, diffuse reflection spectroscopy (DRS), and the AC dielectric measurements. It was concluded that it is possible to construct a core/shell structure in TiO2 ceramic by doping with Bi ions. Thus, the dielectric measurements show the creation of colossal permittivity (CP) of magnitude ’ ~103 in the frequency range: 1 ≤f ≤100kHz. The CP results were explained within the framework of the core/shell model and doping mechanisms. It was found the present CP phenomenon can be switched off by Li co-doping, which was explained within the framework of doping mechanisms.
{"title":"Effect of coalesce doping of Li and Bi on structural, optical and dielectric properties of TCO anatase TiO2 nanoparticles","authors":"A. Dakhel","doi":"10.1051/epjap/2022220043","DOIUrl":"https://doi.org/10.1051/epjap/2022220043","url":null,"abstract":"Anatase (TiO2) ceramic nanoparticle (NPs) powder doped with Bi/Li ions was synthesized by a facial precipitation method. The structural, optical, and electrical properties of the NP powders were studied by X‐Ray diffraction, diffuse reflection spectroscopy (DRS), and the AC dielectric measurements. It was concluded that it is possible to construct a core/shell structure in TiO2 ceramic by doping with Bi ions. Thus, the dielectric measurements show the creation of colossal permittivity (CP) of magnitude ’ ~103 in the frequency range: 1 ≤f ≤100kHz. The CP results were explained within the framework of the core/shell model and doping mechanisms. It was found the present CP phenomenon can be switched off by Li co-doping, which was explained within the framework of doping mechanisms.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"42 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122983839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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