Indian Journal of Physics最新文献_第10页

Bird nest-like shape of polypyrrole-iodide/iodine complex nanocomposite with highly optical and morphological behavior for green hydrogen generation 具有高度光学和形态学特性的鸟巢状聚吡咯-碘/碘复合物纳米复合材料用于绿色制氢

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-19 DOI: 10.1007/s12648-024-03353-7

Mohamed Rabia, Eman Aldosari, Mahmoud Moussa

{"title":"Bird nest-like shape of polypyrrole-iodide/iodine complex nanocomposite with highly optical and morphological behavior for green hydrogen generation","authors":"Mohamed Rabia, Eman Aldosari, Mahmoud Moussa","doi":"10.1007/s12648-024-03353-7","DOIUrl":"10.1007/s12648-024-03353-7","url":null,"abstract":"<div><p>A novel bird nest-like structured complex nanocomposite, known as polypyrrole-iodide/iodine (Ppy-I/I<sub>2</sub>), has been successfully synthesized using a one-pot oxidation reaction involving pyrrole and iodine materials. This complex nanocomposite exhibits highly promising characteristics both in terms of morphology and optics properties. The distinctive morphological features of the Ppy-I/I<sub>2</sub> complex nanocomposite are particularly noteworthy. Its bird nest-like structure consists of particles with well-defined cavities inside and small particles adorning the exterior surfaces. The distinctive morphology significantly improves the active sites and acts as an efficient photon trap, enhancing its exceptional optical properties. The bandgap of this composite measures 2.45 eV, which is a significant advantage for a polymer-based complex composite. This bandgap value makes it particularly applicable, especially in the realm of optoelectronics and photoelectrochemical processes. One of the standout applications for this complex nanocomposite is its use as a photocathode for the H<sub>2</sub> generation using the Red Sea water. Under various light conditions: white light and specific photon wavelengths, the photocathode demonstrates its efficiency. The current density (J<sub>ph</sub>) values obtained are highly indicative of its performance, reaches − 0.8 mA cm<sup>−2</sup> under white light. Moreover, at temperatures 30–50 °C, the J<sub>ph</sub> values show a notable improvement, rising from − 0.8 to − 0.89 mA cm<sup>−2</sup>, which highlights the photocathode's versatility and potential for enhanced hydrogen generation.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 1","pages":"283 - 292"},"PeriodicalIF":1.6,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-depth dielectric study of bulk nanocrystalline β-H2Pc with different biasing and photovoltaic performance of β-H2Pc/p-Si solar cell under varied illumination 不同偏压下块状纳米晶 β-H2Pc 的深度介电研究以及不同光照下 β-H2Pc/p-Si 太阳能电池的光伏性能

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-18 DOI: 10.1007/s12648-024-03267-4

A. A. El-Saady, A. A. M. Farag, N. Roushdy, Dalia M. Abdel Basset, M. M. El-Nahass

{"title":"In-depth dielectric study of bulk nanocrystalline β-H2Pc with different biasing and photovoltaic performance of β-H2Pc/p-Si solar cell under varied illumination","authors":"A. A. El-Saady, A. A. M. Farag, N. Roushdy, Dalia M. Abdel Basset, M. M. El-Nahass","doi":"10.1007/s12648-024-03267-4","DOIUrl":"10.1007/s12648-024-03267-4","url":null,"abstract":"<div><p>This study offers a comprehensive analysis of the thermal stability of β-metal-free phthalocyanine (β-H<sub>2</sub>Pc) powder, demonstrating its resilience at temperatures of approximately 470°C. The nanocrystalline nature of β-H<sub>2</sub>Pc was confirmed using scanning electron microscopy, particle size analysis, and atomic force microscopy. Furthermore, an extensive exploration of the dielectric properties of bulk β-H<sub>2</sub>Pc, in the form of compacted pellets, was undertaken over a wide frequency range (10 Hz–20 MHz) at different temperatures (303, 348, and 423 K), with consideration of the impact of DC-bias voltages (− 2 V to 2 V). Interestingly, the examined dielectric characteristics exhibited a substantial dependency on bias voltage, frequency, and temperature. The series resistance diminishes with increasing temperature, indicating enhanced device performance under elevated thermal conditions. In addition, this study delved into the photovoltaic characteristics of the β-H<sub>2</sub>Pc/p-Si diode under various illumination levels and was used to evaluate its potential for optoelectronic applications. The observed current density–voltage behavior demonstrates diode-like properties, with the generated current showing evidence of thermal activation. Furthermore, the Fill Factor decreased with increasing illumination intensity and power.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 1","pages":"129 - 143"},"PeriodicalIF":1.6,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring electronic, structural, optical, and elastic properties of MgX2O6 (x = Ta, Nb) compounds for photovoltaic and optoelectronic applications: first study effort 探索用于光伏和光电应用的 MgX2O6（x = Ta、Nb）化合物的电子、结构、光学和弹性特性：首次研究工作

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-18 DOI: 10.1007/s12648-024-03147-x

Murat Aycibin, Mustafa Çelebi, Mehmet Erzen, Harun Akkuş

引用次数: 0

Synthesis and characterization of structural, electrical, magnetic and microwave properties of Ba0.5Sr0.5Fe12O19-polyaniline nanocomposites Ba0.5Sr0.5Fe12O19 聚苯胺纳米复合材料的结构、电学、磁学和微波特性的合成与表征

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-18 DOI: 10.1007/s12648-024-03336-8

Tavus Hosseinabad, Gholamreza Nabiyouni, Kambiz Hedayati

{"title":"Synthesis and characterization of structural, electrical, magnetic and microwave properties of Ba0.5Sr0.5Fe12O19-polyaniline nanocomposites","authors":"Tavus Hosseinabad, Gholamreza Nabiyouni, Kambiz Hedayati","doi":"10.1007/s12648-024-03336-8","DOIUrl":"10.1007/s12648-024-03336-8","url":null,"abstract":"<div><p>In this article, barium strontium hexaferrite was synthesized using the surfactant-free ultrasonic method. Then Ba<sub>0.5</sub>Sr<sub>0.5</sub>Fe<sub>12</sub>O<sub>19</sub>/polyaniline nanocomposites were made in the form of thick layer, thin film and nanofibers. The bulk layer forges via the in-situ synthesis method, and the thin film is synthesized by electrodeposition in cyclovoltammetry mode. The nanofibers were manufactured using the electrospinning method. The products were investigated via X-ray diffractometer, field emission scanning electron microscope, transmission electron microscope, and vibration sample magnetometer. The band gap, exciton binding energy, and the Urbach energy of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Fe<sub>12</sub>O<sub>19</sub> nanoparticles were calculated by optical and electrical methods. The reflection loss of nanocomposites at frequencies between 2 and 18 GHz was measured by Vector Network Analyzer. The magnetic properties of nanoparticles were weakened by their presence in the polymer matrix. The DC conductivity of polyaniline decreased by adding ferrite nanoparticles to it and reached from 0.67 S.cm<sup>−1</sup> in pure polyaniline to 2.5 × 10<sup>–5</sup> S.cm<sup>−1</sup> in composite nanofibers. The highest value of reflection loss (RL<sub>min</sub>) − 16.99 dB at the frequency (f<sub>min</sub>) of 11.2 GHz was obtained for the thick layer nanocomposite.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 3","pages":"963 - 973"},"PeriodicalIF":1.6,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The radial scalar power potential and its application to quarkonium systems 径向标量幂势及其在夸克鎓系统中的应用

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-17 DOI: 10.1007/s12648-024-03335-9

Etido P. Inyang, N. Ali, R. Endut, N. Rusli, S. A. Aljunid

引用次数: 0

Investigation of the entrapped micro bubble defect as a high-energy laser damage precursor in fused silica optics 研究熔融石英光学器件中作为高能激光损伤前兆的夹带微气泡缺陷

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-16 DOI: 10.1007/s12648-024-03337-7

Shuo Hu, Shuai Zhang, Lihua Lu, Haozhe Liu, Xinxiang Miao, Jiaxuan Chen

{"title":"Investigation of the entrapped micro bubble defect as a high-energy laser damage precursor in fused silica optics","authors":"Shuo Hu, Shuai Zhang, Lihua Lu, Haozhe Liu, Xinxiang Miao, Jiaxuan Chen","doi":"10.1007/s12648-024-03337-7","DOIUrl":"10.1007/s12648-024-03337-7","url":null,"abstract":"<div><p>Irrespective of the manufacturing process, heat pretreatment, and laser repair of optics, it is possible for entrapped bubbles to form at the subsurface or in the bulk of fused silica optics installed in high-energy laser systems. The micro bubble defect may act as a precursor to high-energy laser damage. The objective of this paper is to investigate the impact of constrained bubbles with varying characteristics on light field intensity when subjected to high-energy laser irradiation. The light intensity enhancement factor was calculated to estimate the intensification of laser energy in local areas within the material, with the aim of determining the extent of laser-induced damage. The results, which reveal a wrinkle-like light field pattern modulated by the bubble, shed light into the location and mechanism of laser-induced damage. The modulation effect of an irregular bubble is more pronounced than that of a spherical bubble. The optical transmission principle of the laser beam within the material was elucidated. The results of the experiment, which utilized nanosecond pulsed ultraviolet laser in a Gaussian beam, demonstrated that the laser-induced damage thresholds of fused silica with micro-bubble defects were lower than those of pure fused silica. This paper identifies the role of the bubble as a high-energy laser damage precursor and provides a foundation for theoretical research into the high-energy laser-induced damage mechanism of optical materials.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 3","pages":"975 - 986"},"PeriodicalIF":1.6,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141643007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Calculation of the lifetimes for Rydberg states of Li by B-spline approach 用 B-样条法计算锂的雷德贝格态寿命

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-16 DOI: 10.1007/s12648-024-03322-0

Zhangli Lai, Qingdong Gou, Yong Li

引用次数: 0

The promising potential of half Heusler EuFeSb alloy for high-performance thermoelectric with improved half-metallicity and optical properties: a DFT study 具有改进的半金属性和光学特性的半 Heusler EuFeSb 合金在高性能热电方面的巨大潜力：一项 DFT 研究

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-16 DOI: 10.1007/s12648-024-03333-x

S. Idrissi, A. Jabar, L. Bahmad

{"title":"The promising potential of half Heusler EuFeSb alloy for high-performance thermoelectric with improved half-metallicity and optical properties: a DFT study","authors":"S. Idrissi, A. Jabar, L. Bahmad","doi":"10.1007/s12648-024-03333-x","DOIUrl":"10.1007/s12648-024-03333-x","url":null,"abstract":"<div><p>In this study, we have employed the density functional theory to investigate the structural, electronic, optic, and thermoelectric properties of the new Half Heusler EuFeSb alloy. We have explored the structural properties of the EuFeSb alloy and their stability. Our results revealed that the ferromagnetic phase is more favorable and stable when compared to the anti-ferromagnetic one. Furthermore, the electronic properties exhibited a half metallic behavior. In addition, the minority spin configuration presents a semi-conductor behavior with a band gap of 1.106 eV of the Heusler EuFeSb alloy. Additionally, we have explored the optical properties, including its absorption coefficient, refractive index, electron energy loss, and optical conductivity. Indeed, the absorption coefficient shows that the spectrum exhibits a higher value in the ultraviolet region than in the visible region. This characteristic has potential applications in material photocells. Finally, we have carried out the thermoelectric analysis of the Half Heusler EuFeSb alloy using the Boltztrap code. The Seebeck coefficient electrons at T = 250 K reach a minimum value of − 16 µV/K, indicating that the compound is an n-type material due to the negative values of the total Seebeck coefficient. This property of the Heusler EuFeSb alloy allows it to convert a portion of its thermal energy into electrical energy, making it a potential candidate for thermoelectric applications.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 3","pages":"953 - 962"},"PeriodicalIF":1.6,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141642707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Micro-Raman spectroscopy of graphene defects and tracing the oxidation process caused by UV exposure 石墨烯缺陷的微拉曼光谱分析以及紫外线照射引起的氧化过程追踪

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-15 DOI: 10.1007/s12648-024-03338-6

Somayeh Gholipour, Maryam Bahreini, Mohamad Reza Jafarfard

{"title":"Micro-Raman spectroscopy of graphene defects and tracing the oxidation process caused by UV exposure","authors":"Somayeh Gholipour, Maryam Bahreini, Mohamad Reza Jafarfard","doi":"10.1007/s12648-024-03338-6","DOIUrl":"10.1007/s12648-024-03338-6","url":null,"abstract":"<div><p>Raman spectroscopy is a widely used method for the analysis of various samples, including carbon-based materials. This study aimed to identify the number of layers and defects in graphene using micro-Raman spectroscopy. More specifically, this study examined the oxidation process of graphene under UV exposure. An investigation of the effect of the power density of the Raman excitation laser revealed a linear dependence between the ratio of I<sub>2D</sub>/I<sub>G</sub> and the power density of the excitation laser. Additionally, the absence of peak D due to the increase in power density provides evidence for the nondestructive nature of micro-Raman spectroscopy. Given the value of I<sub>2D</sub>/I<sub>G</sub>, one of the parameters for determining the number of layers in graphene, which reaches 1.39 at the edge, the findings indicate the possibility of an edge fold of single-layer graphene. During the oxidation process, the intensity and position of the D peak increase as a function of exposure time. Alterations in the graphene Raman spectrum, comprising the disappearance of the 2D peak and the appearance of the D peak, trace and confirm the oxidation process of the sample.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1463 - 1469"},"PeriodicalIF":1.6,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141722355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Equilibrium description of thermodynamics in f(R, T) gravity f(R, T) 引力下的热力学平衡描述

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-15 DOI: 10.1007/s12648-024-03132-4

Sudabeh Akbarpour, Akram S. Sefiedgar

{"title":"Equilibrium description of thermodynamics in f(R, T) gravity","authors":"Sudabeh Akbarpour, Akram S. Sefiedgar","doi":"10.1007/s12648-024-03132-4","DOIUrl":"10.1007/s12648-024-03132-4","url":null,"abstract":"<div><p>The <i>f</i>(<i>R</i>, <i>T</i>) gravity as a modified theory of gravity is considered to study the Friedmann–Robertson–Walker (FRW) universe. We consider the case <span>(f(R,T)=f_1(R)+2f_2(T))</span>, where <span>(f_1(R))</span> is an arbitrary function of Ricci scalar and <span>(f_2(T))</span> is an arbitrary function of the trace of the energy-momentum tensor. Using the usual field equations, the conservation equation does not hold. However, we can redefine the field equations to satisfy the conservation equation. In this paper, we show that the FRW universe, as a closed system, may have a conserved 4-momentum if we assume an interaction between matter and the dark energy component coming from <span>(f_2(T))</span>. The rate of the energy transfer between the ordinary matter and the dark energy component induced by <span>(f_2(T))</span> is obtained. Then, we derive the first law of thermodynamics by using the field equations and the standard entropy-area law on the apparent horizon. It is shown that there is an equality between the Friedmann equation and the first law of thermodynamics. One can also find an equilibrium description of thermodynamics in <i>f</i>(<i>R</i>, <i>T</i>) gravity. In addition, we investigate the validity of the generalized second law of thermodynamics. It is shown that the generalized second law of thermodynamics is always satisfied in the FRW universe.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 12","pages":"4217 - 4223"},"PeriodicalIF":1.6,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141647010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0