Journal of the Korean Physical Society最新文献_第4页

Dependence of ozone concentration on the moisture barrier properties of aluminum oxide using atomic layer deposition 原子层沉积法研究臭氧浓度对氧化铝隔湿性能的影响

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-06-10 DOI: 10.1007/s40042-025-01410-w

Yeongtae Choi, Seokyoon Shin, Changwoo Byun, Hee-Soo Kim, Hyeongtag Jeon

{"title":"Dependence of ozone concentration on the moisture barrier properties of aluminum oxide using atomic layer deposition","authors":"Yeongtae Choi, Seokyoon Shin, Changwoo Byun, Hee-Soo Kim, Hyeongtag Jeon","doi":"10.1007/s40042-025-01410-w","DOIUrl":"10.1007/s40042-025-01410-w","url":null,"abstract":"<div>As a thin film encapsulation method, atomic layer deposition (ALD) has the potential to provide superior protection for organic light-emitting diodes (OLEDs). However, the application of H2O and O2 plasma in the traditional ALD process has not yet resulted in a successful moisture barrier. The large dipole moment of H2O may result in excess residual hydroxyl groups, and the flux of charged particles from O2 plasma can damage organic materials. Here, we suggest the use of ozone (O3) as an alternative reactant to mitigate these limiting factors. It is a powerful oxidizer and is much more volatile than other oxidizing agents. Thus, O3 is a promising oxygen source to improve moisture barrier properties for OLEDs. This work describes the dependence of O3 concentration on the moisture barrier properties of Al2O3 thin films prepared by ozone-based ALD at 100 °C. Trimethylaluminum and O3 were utilized as aluminum and oxygen precursors, respectively. The O3 concentration varied from 100 to 400 g/m3 in increments of 100 g/m3. An increase in O3 concentration resulted in a significant enhancement in the moisture barrier performance of Al2O3, with values improving from 7.1 × 10⁻4 to 1.9 × 10⁻5 g/m2/day. Further characterization indicated that Al2O3 thin films produced at elevated O3 concentrations exhibited superior physical and chemical properties compared to those generated at lower O3 concentrations.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 3","pages":"275 - 280"},"PeriodicalIF":0.9,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143109","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

Enhancing gamma-ray shielding performance of HDPE composites using PbO and Bi₂O₃ reinforcements PbO和Bi₂O₃增强HDPE复合材料的γ射线屏蔽性能

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-06-06 DOI: 10.1007/s40042-025-01405-7

M. R. Alipoor

{"title":"Enhancing gamma-ray shielding performance of HDPE composites using PbO and Bi₂O₃ reinforcements","authors":"M. R. Alipoor","doi":"10.1007/s40042-025-01405-7","DOIUrl":"10.1007/s40042-025-01405-7","url":null,"abstract":"<div>The purpose of the research presented is to investigate the protective capacities against gamma-ray and X-ray of high-density polyethylene materials reinforced with different concentrations oxide of lead and bismuth. The materials under study were exposed to a range of gamma ray energy levels and their protective efficiency is quantitatively evaluated through the analytical measurement of several parameters, including mass attenuation coefficient, linear attenuation coefficient and half-value layer. The results derived from both theoretical calculations by Phy-x and simulated outcomes by the Geant4 simulation tool demonstrate a commendable level of correlation and consistency, thereby reinforcing the validity of the findings reported in this study. As photon energy increased, the radiation protection efficiency decreased, while as thickness increased, the radiation protection efficiency increased. It is particularly noteworthy that high-density polyethylene composites, reinforced with specific concentrations of lead and bismuth, exhibit superior radiation shielding properties. This remarkable performance can be attributed to the strategic dispersion of heavy metals as well as their associated density characteristics, which together contribute to the effectiveness of these materials in reducing harmful radiation. Finally, the fast neutron removal cross section was also calculated for polymer composites. In conclusion, these findings emphasize the potential of lead–bismuth-reinforced high-density polyethylene composites as promising materials for radiation shielding applications.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 3","pages":"243 - 253"},"PeriodicalIF":0.9,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145142636","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

Impact of prior reactions on the recovery behavior of MoS2 transistors 先前反应对二硫化钼晶体管恢复行为的影响

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-06-04 DOI: 10.1007/s40042-025-01406-6

Hyunjin Ji

{"title":"Impact of prior reactions on the recovery behavior of MoS2 transistors","authors":"Hyunjin Ji","doi":"10.1007/s40042-025-01406-6","DOIUrl":"10.1007/s40042-025-01406-6","url":null,"abstract":"<div>The electrical property changes in monolayer MoS2 transistors were analyzed after bistriflimide (H-TFSI) treatment, which dissociates into hydrogen cations and TFSI anions in solution, followed by intensive acetone rinsing. Charge trapping effects were examined by varying the delay time (0.1, 1, 5 s) between voltage application and current measurement, revealing changes in electrical hysteresis. While degradation in device performance was primarily attributed to TFSI anion adsorbates, a transition to counterclockwise hysteresis was observed as H+ ion effects became more pronounced, leading to a reduction of degradation or slight improvement in performance. To further assess interface trap characteristics, low-frequency noise modeling was conducted for each device condition, enabling the extraction of trap density and Coulomb scattering effects. The reversibility of H-TFSI treatment effects was also evaluated through a 24-h acetone rinse. The results indicated that the impact of H+ ions was almost entirely reversed, restoring the interface trap density to its initial state. However, carrier mobility did not fully recover, suggesting that residual TFSI anion adsorbates remained on the surface, contributing to persistent degradation. These findings demonstrate that hydrogen cations can sufficiently penetrate and exit from both MoS2 and SiO2, allowing defect neutralization to be reset through aggressive rinsing. In contrast, TFSI anions, which adsorb onto the surface, are not fully removable using liquid-phase cleaning methods. This highlights a potential processing strategy in which a passivation layer, impermeable to large molecules, is placed on top of the device before H-TFSI treatment, enabling selective defect passivation solely by H+ ions.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 3","pages":"292 - 298"},"PeriodicalIF":0.9,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145142663","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

T–X phase diagram calculated for the tilted smectic–hexatic transitions in the binary mixtures (THI14 + MPR6) 二元混合物（THI14 + MPR6）中倾斜近六态转变的T-X相图计算

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-06-04 DOI: 10.1007/s40042-025-01396-5

Ozlem Tari, Hamit Yurtseven

引用次数: 0

Heat transfer analysis of nanofluid through inclined channels under the influence of thermal radiation and magnetic field 热辐射和磁场作用下纳米流体斜通道传热分析

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-06-02 DOI: 10.1007/s40042-025-01400-y

Refat Ullah Jan, Hamid Khan, Walid Emam, Zeeshan Ali, Subhan Ullah, Dolat Khan, Dragan Pamucar

{"title":"Heat transfer analysis of nanofluid through inclined channels under the influence of thermal radiation and magnetic field","authors":"Refat Ullah Jan, Hamid Khan, Walid Emam, Zeeshan Ali, Subhan Ullah, Dolat Khan, Dragan Pamucar","doi":"10.1007/s40042-025-01400-y","DOIUrl":"10.1007/s40042-025-01400-y","url":null,"abstract":"<div>This study explores Jeffery–Hamel (JH) flow using nanofluids, which have many practical applications in areas that need efficient heat transfer and precise control of fluid flow, especially in converging or diverging channels. These applications include technologies like heat exchangers, cooling systems for electronics, and solar thermal collectors. Specific applications include microscale heat sinks in electronic cooling, magnetohydrodynamic pumps in biomedical devices, and solar thermal collectors. Inspired by these real-world applications of Jeffery–Hamel flow, it is aimed to improve the thermal efficiency of the fluid, by introducing magnetic parameter and thermal radiation in the nanofluids. The analysis of this research study considers water based nanofluid with copper (Cu) as nanoparticles, which modeled a system of nonlinear equation and computed through NDSolve technique. The numerical results so obtained are compared with already existing studies, showing a good match and confirming the consistency of the proposed method. The study carefully examines, impact of the Hartmann number, nanoparticles concentration, and thermal radiation affects the velocity and temperature fields.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 2","pages":"144 - 154"},"PeriodicalIF":0.9,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161236","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

A derivation of impedance formula of cylindrical capacitively coupled plasma source in moderately high-frequency range 中高频圆柱形电容耦合等离子体源阻抗公式的推导

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-06-02 DOI: 10.1007/s40042-025-01404-8

Nam-Sik Yoon

引用次数: 0

Dynamics of endoscopy on the peristaltic flow of non-Newtonian fluid through an annulus region between two flexible tubes with Soret and Dufour effects 具有Soret和Dufour效应的柔性管间环空区域非牛顿流体的内窥镜动力学研究

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-06-02 DOI: 10.1007/s40042-025-01408-4

A. Fayyaz, Z. Abbas, M. Y. Rafiq

{"title":"Dynamics of endoscopy on the peristaltic flow of non-Newtonian fluid through an annulus region between two flexible tubes with Soret and Dufour effects","authors":"A. Fayyaz, Z. Abbas, M. Y. Rafiq","doi":"10.1007/s40042-025-01408-4","DOIUrl":"10.1007/s40042-025-01408-4","url":null,"abstract":"<div>Endoscopes play a vital role in diagnosing and treating medical conditions, especially in organs that rely on peristaltic motion for fluid transport, such as the stomach and intestines. Therefore, this study explores how an endoscope affects the peristaltic movement of a hyperbolic tangent fluid within an annular region formed by two cylinders. The inner cylinder is flexible, following a sinusoidal wave pattern, while the outer cylinder remains rigid and moves at a constant velocity. The mathematical model is developed using the long-wavelength approximation and low Reynolds number assumptions, simplifying the complex fluid dynamics. The energy equation accounts for thermal radiation and heat absorption or release from a heat sink/source, while the mass transfer equation incorporates Soret (thermal diffusion) and Dufour (diffusion-thermo) effects. Analytical solutions for velocity, pressure gradient, temperature, concentration, and streamlines are derived using a perturbation method. Graphical analysis reveals that increasing Soret and Dufour numbers enhances temperature distribution by promoting heat transfer but reduces fluid concentration due to stronger diffusion effects. These results have significant medical applications, particularly in optimizing endoscopic procedures for diagnosing internal organ disorders. Additionally, the findings emphasize how pressure gradient variations can regulate fluid flow rates, which is crucial for procedures like catheter insertion in arteries where precise flow control is essential. </div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 2","pages":"164 - 185"},"PeriodicalIF":0.9,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161165","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

Optimized luminescent intensity of NaLa(MoO4)2: Ho3+,Yb3+ upconversion phosphors by orthogonal design and quadratic universal rotary methodology 采用正交设计和二次通用旋转法优化NaLa(MoO4)2: Ho3+，Yb3+上转换荧光粉的发光强度

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-06-02 DOI: 10.1007/s40042-025-01407-5

Shengyi Liu, Duan Gao, Shang Gao, Qianmiao Yu, Xin Chen, Mingyu Cui, Xilai Zhang, Li Wang, Wenbin Song

{"title":"Optimized luminescent intensity of NaLa(MoO4)2: Ho3+,Yb3+ upconversion phosphors by orthogonal design and quadratic universal rotary methodology","authors":"Shengyi Liu, Duan Gao, Shang Gao, Qianmiao Yu, Xin Chen, Mingyu Cui, Xilai Zhang, Li Wang, Wenbin Song","doi":"10.1007/s40042-025-01407-5","DOIUrl":"10.1007/s40042-025-01407-5","url":null,"abstract":"<div>To optimize the yellow upconversion luminescence intensity of NaLa(MoO4)2: Ho3+/Yb3+ phosphor material, we combined orthogonal experimental design and rotatable central composite design and adopted a two-step continuous optimization method to comprehensively optimize Ho3+ and Yb3+. Through this method, we determined the optimal ion doping concentrations for the strongest yellow light emission in this system. We synthesized the NaLa(MoO4)2: Ho3+/Yb3+ phosphor material with the strongest yellow upconversion luminescence intensity by the high-temperature solid-state reaction method and conducted a detailed study on the crystal structure and upconversion luminescence characteristics of the sample. Under 980 nm excitation, we measured the upconversion emission spectra of the optimal sample under different excitation currents. The results show that the yellow upconversion luminescence of the sample is a two-photon process, and the intensity limitation relationship is confirmed. Additionally, by applying the temperature sensitivity formula for non-thermally coupled energy levels, the relative sensitivity of Ho3⁺/Yb3⁺ doped phosphor was calculated to be 0.0062 K−1. These findings demonstrate that NaLa(MoO4)2: Ho3⁺/Yb3⁺ possesses excellent upconversion luminescence properties, making it a strong candidate for yellow-emitting phosphors and a viable material for temperature sensing applications.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 2","pages":"213 - 224"},"PeriodicalIF":0.9,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161237","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

Advanced characterization of the structural and electrical properties of La0.6Ce0.2Ba0.2FeO3 synthesized via the sol–gel method 溶胶-凝胶法制备La0.6Ce0.2Ba0.2FeO3的结构和电性能的高级表征

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-05-28 DOI: 10.1007/s40042-025-01402-w

Houcine Dhahri, Mnassri Seif Eddine, C. Trifi, Aref Omri, E. Dhahri, M. P. F. Graça, B. F. O. Costa, Rached Ben Younes

{"title":"Advanced characterization of the structural and electrical properties of La0.6Ce0.2Ba0.2FeO3 synthesized via the sol–gel method","authors":"Houcine Dhahri, Mnassri Seif Eddine, C. Trifi, Aref Omri, E. Dhahri, M. P. F. Graça, B. F. O. Costa, Rached Ben Younes","doi":"10.1007/s40042-025-01402-w","DOIUrl":"10.1007/s40042-025-01402-w","url":null,"abstract":"<div>In this work, we investigated the morphological, structural, and electrical characteristics of the sol–gel-synthesized La0.6Ce0.2Ba0.2FeO3 compound. The synthesis of LCBFO, with an orthorhombic structure and space group Pbnm, along with the secondary phases CeO2 and Ce11O20, was verified by X-ray diffraction (XRD) research. SEM micrographs revealed round grains with noticeable porosity. Thermal analysis using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) demonstrated stable thermal behavior, with a significant weight loss occurring around 340 °C due to the decomposition of organic residues. Mössbauer spectroscopy confirmed the presence of Fe (III) ions in octahedral coordination, with an additional site attributed to Ba substitution. Electrical conductivity measurements analyzed using Jonscher’s universal power law ((sigma left(omega right)= {sigma }_{text{dc} }+A{omega }^{text{s}})) showed a DC conductivity (σdc) of 1.25 × 10–4 S/cm at room temperature, with an activation energy (Ea) of 0.265 eV determined from the Arrhenius plot. The dielectric permittivity, modeled using the Maxwell–Wagner interfacial polarization theory, exhibited a relaxation phenomenon with a peak observed at 10 kHz. These results suggest that La0.6Ce0.2Ba0.2FeO3 synthesized via the sol–gel method exhibits promising structural integrity and electrical properties, making it a potential candidate for applications in chemical sensors, fuel cells, and magnetic materials.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 2","pages":"201 - 212"},"PeriodicalIF":0.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145170119","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

Contact-geometry-dependent vertical channel migration in multilayer ReS2 field-effect transistors 多层ReS2场效应晶体管中与接触几何相关的垂直沟道迁移

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-05-27 DOI: 10.1007/s40042-025-01403-9

Doyoon Kim, Jinwoo Ahn, Hyeran Cho, Gyu-Tae Kim

{"title":"Contact-geometry-dependent vertical channel migration in multilayer ReS2 field-effect transistors","authors":"Doyoon Kim, Jinwoo Ahn, Hyeran Cho, Gyu-Tae Kim","doi":"10.1007/s40042-025-01403-9","DOIUrl":"10.1007/s40042-025-01403-9","url":null,"abstract":"<div>Understanding the interlayer charge transport in multilayer two-dimensional (2D) semiconductors is crucial for optimizing device performance and interface engineering in emerging nanoelectronic systems. In particular, the presence of significant interlayer resistance such as multilayers of ReS2 induces bias-dependent redistribution of conduction channels, resulting in channel migration vertically. Here, we experimentally investigate the contact-geometry-dependent channel migration behavior in multilayer ReS2 field-effect transistors (FETs) using a vertically stacked h-BN/ReS2/h-BN heterostructure. Devices with symmetric top contacts, symmetric edge contacts, and asymmetric (hetero) contact configurations are fabricated on the same flake. Systematic measurements of transconductance (gm), its derivative (dgm), and threshold voltage (Vth), combined with theoretical modeling based on Thomas–Fermi screening and interlayer resistor networks, reveal that top-contacted devices exhibit a downward migration of the main conduction channel with increasing drain bias. In contrast, edge-contacted devices maintain a stable bottom-centered conduction profile, independent of drain bias conditions. In the hetero-contact configuration, where the source electrode is edge-contacted, direct carrier injection into all layers enhances vertical channel selectivity, resulting in earlier onset and more pronounced channel migration even at relatively low drain bias. In addition, the field-effect mobility extracted from gₘ and its agreement with low-field mobility from the Y-function method confirms that interfacial scattering, rather than contact resistance, predominantly limits device performance. This study provides direct experimental insights into vertical charge migration in multilayer 2D materials and offers design guidelines for engineering contact strategies in future 2D FETs. </div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 2","pages":"194 - 200"},"PeriodicalIF":0.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169484","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