Current Applied Physics最新文献_第7页

Magnetic field mediated temperature sensing with a solid-state spin qubit: a proposal for hybrid quantum thermometry with a permanent magnet 用固态自旋量子位元进行磁场介导的温度传感：用永磁体进行混合量子测温的建议

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-07-02 DOI: 10.1016/j.cap.2025.07.001

Kihwan Kim , Dongkwon Lee , Yisoo Na, Donghun Lee

{"title":"Magnetic field mediated temperature sensing with a solid-state spin qubit: a proposal for hybrid quantum thermometry with a permanent magnet","authors":"Kihwan Kim , Dongkwon Lee , Yisoo Na, Donghun Lee","doi":"10.1016/j.cap.2025.07.001","DOIUrl":"10.1016/j.cap.2025.07.001","url":null,"abstract":"<div><div>Diamond nitrogen-vacancy (NV) centers are promising thermal sensors with versatile applications, from electronic devices to biomedical systems. However, conventional thermometry relies on the intrinsic property of the NV center, temperature dependence of the zero-field splitting, which is small and significantly reduces at low temperatures (<150 K). Here, we propose a hybrid quantum thermometry combining diamond NV centers with a permanent magnet with a high reversible temperature coefficient. This method converts temperature variations into magnetic field signals, detected by NV centers through magnetometry protocols like Ramsey interferometry. Our calculations show that this approach enhances thermal sensitivity by a factor of 10 to 10<sup>4</sup> compared to conventional thermometry, including thermal echo and thermal Carr-Purcell-Meiboom-Gill (TCPMG). Moreover, it operates across a wide temperature range, down to 20 K, making it suitable for cryogenic quantum thermometry. This proposal offers significant advancement over current NV thermometry, enabling highly sensitive, low-temperature measurements.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 60-66"},"PeriodicalIF":2.4,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570727","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 green synthesis of dual-phase metal oxide nanoparticles for environmental remediation 环境修复用双相金属氧化物纳米颗粒绿色合成优化研究

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-28 DOI: 10.1016/j.cap.2025.06.013

Harpreet Kaur , Gassoumi Bouzid , Sanjeev Kumar , Ramandeep Kaur , Sahbi Ayachi , Mir Waqas Alam

{"title":"Optimized green synthesis of dual-phase metal oxide nanoparticles for environmental remediation","authors":"Harpreet Kaur , Gassoumi Bouzid , Sanjeev Kumar , Ramandeep Kaur , Sahbi Ayachi , Mir Waqas Alam","doi":"10.1016/j.cap.2025.06.013","DOIUrl":"10.1016/j.cap.2025.06.013","url":null,"abstract":"<div><div>This study presents the first reported investigation of <em>Nigella sativa</em> (<em>NS</em>) leaf extract as a natural reducing and stabilizing agent for the green synthesis of copper oxide nanoparticles (<em>NS</em>:CuO NPs). Structural analysis confirmed a mixed monoclinic and cubic phase having crystallite size of 23 nm. The optical study depicted an absorption peak at 361 nm and band gap energy of 2.30 eV. Surface chemistry revealed the functional groups, including O–H, N–H, C–H, C=O, and N–O on the surface of particles, indicating phytochemical capping on the nanoparticle surface. Morphological studies revealed spherical and elongated particles, with diameters of 8–10 nm and lengths ranging from 50 to 125 nm. The <em>NS</em>:CuO NPs showed excellent photocatalytic performance, achieving ∼98 % and ∼89 % degradation of Malachite Green and Congo Red under visible light within 60 min and 140 min, following pseudo-first-order kinetics with a rate constant of 0.05463 , supported min<sup>−1</sup> and 0.01548 min<sup>−1</sup>, respectively. The high efficiency was primarily attributed to superoxide radicalsby other reactive oxygen species. The catalyst maintained over 90 % degradation efficiency after five consecutive cycles.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 29-47"},"PeriodicalIF":2.4,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523322","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 toxic gas sensors based on polyvinylpyrrolidone-polypyrrole/graphene oxide-ITO nanocomposites: Enhanced sensitivity toward reducing and oxidizing gases 基于聚乙烯吡咯烷酮-聚吡咯/氧化石墨烯- ito纳米复合材料的先进有毒气体传感器：增强对还原性和氧化性气体的敏感性

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-27 DOI: 10.1016/j.cap.2025.06.012

Rand Waleed, Ehssan Al-Bermany

{"title":"Advanced toxic gas sensors based on polyvinylpyrrolidone-polypyrrole/graphene oxide-ITO nanocomposites: Enhanced sensitivity toward reducing and oxidizing gases","authors":"Rand Waleed, Ehssan Al-Bermany","doi":"10.1016/j.cap.2025.06.012","DOIUrl":"10.1016/j.cap.2025.06.012","url":null,"abstract":"<div><div>Polymer nanocomposites are revolutionizing gas sensing technology through high sensitivity, flexibility, and cost-effectiveness. The impact of conductive polypyrrole, graphene oxide, and indium tin oxide on polyvinylpyrrolidone-based nanocomposites for electrical properties and gas detection was investigated. Fourier transform infrared spectroscopy confirmed the strong bonding among components. X-ray diffraction confirmed the semicrystalline behavior of polyvinylpyrrolidone without change. Field emission scanning electron microscopy images exposed homogenous samples with rough porosity of the sample's surface. The dialectical constant notably improved from 154 to 300, and the AC conductivity significantly enhanced from 1.31∗10<sup>−11</sup> to 4.64∗10<sup>−11</sup> S. cm<sup>−1</sup>. The gas sensitivity of reducing ammonia (NH<sub>3</sub>) and oxidizing nitrogen dioxide (NO<sub>2</sub>) was tested for samples at different temperatures. The maximum sensitivity of NO<sub>2</sub> reached 25 % at 250 °C, while NH<sub>3</sub> recorded a sensitivity of 5.81 % at 150 °C. These results confirm the potential of the hybrid composite materials for fabricating flexible, high-performance gas sensors for environmental and electronic applications.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 48-59"},"PeriodicalIF":2.4,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549233","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

Electrical characteristic depending on the doping concentration of the AlGaSb barrier in the GaSb based dual-band nBn detector 基于GaSb的双波段nBn探测器中AlGaSb势垒掺杂浓度的电特性

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-24 DOI: 10.1016/j.cap.2025.06.011

Jong Hun Lee , Geun Hyeong Kim , Tae In Kang , Min Soo Kwak , Jong Su Kim , Sang Jun Lee , Dong Wan Kim

{"title":"Electrical characteristic depending on the doping concentration of the AlGaSb barrier in the GaSb based dual-band nBn detector","authors":"Jong Hun Lee , Geun Hyeong Kim , Tae In Kang , Min Soo Kwak , Jong Su Kim , Sang Jun Lee , Dong Wan Kim","doi":"10.1016/j.cap.2025.06.011","DOIUrl":"10.1016/j.cap.2025.06.011","url":null,"abstract":"<div><div>This paper investigates the effect of n-type doping in the Al<sub>0.35</sub>Ga<sub>0.65</sub>Sb barrier with undoped, Te:2x10<sup>15</sup> cm<sup>−3</sup>, and Te:2x10<sup>16</sup> cm<sup>−3</sup> doping in the near-infrared (NIR)/short-wavelength infrared (SWIR) nBn detector through temperature-dependent dark current density and photocurrent density measurement. The dark current density at 80 K, 0.1 V were 0.003 A/cm<sup>2</sup> (undoped), 0.005 A/cm<sup>2</sup> (2x10<sup>15</sup> cm<sup>−3</sup>), 0.053 A/cm<sup>2</sup> (2x10<sup>16</sup> cm<sup>−3</sup>). Given the negligible diffusion current and generation-recombination (G-R) current at low temperature, the increase is attributed to increased trap-assisted tunneling (TAT). In addition, the turn-on voltage of photocurrent at 300 K were 50 mV (undoped), 55 mV (2x10<sup>15</sup> cm<sup>−3</sup>), and 70 mV (2x10<sup>16</sup> cm<sup>−3</sup>), showing no significant increase with doping. This study indicates the importance of appropriate barrier doping concentration in designing of GaSb-based nBn detector for low-noise performance.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 24-28"},"PeriodicalIF":2.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514352","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

Revisiting LaMnO3: A density functional theory study 再论LaMnO3：密度泛函理论研究

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-18 DOI: 10.1016/j.cap.2025.06.010

Ju Hyeon Lee, Bongjae Kim

{"title":"Revisiting LaMnO3: A density functional theory study","authors":"Ju Hyeon Lee, Bongjae Kim","doi":"10.1016/j.cap.2025.06.010","DOIUrl":"10.1016/j.cap.2025.06.010","url":null,"abstract":"<div><div>Density functional theory has been widely applied to a variety of realistic materials but often fails to accurately describe the properties of correlated systems. The DFT + <em>U</em> method, which introduces a Hubbard <em>U</em> correction to the DFT, has been instrumental in the study of systems such as transition metal oxides. However, the methodological details of DFT + <em>U</em> and its specific impact on the electronic structure and magnetic properties of correlated systems remain incompletely understood. In this study, using the prototypical transition metal oxide LaMnO<sub>3</sub> as an example, we systematically assess the performance of two distinct DFT + <em>U</em> methods: spin-polarized DFT + <em>U</em> (SDFT + <em>U</em>) and spin-unpolarized charge-only DFT + <em>U</em> (CDFT + <em>U</em>). We found that, while the Coulomb <em>U</em> acts similarly in both approaches, the Hund's <em>J</em><sub>H</sub> plays a fundamentally different role, particularly in determining the correct magnetic phases. Our investigation demonstrates the active role of <em>J</em><sub>H</sub> in the exchange splitting, leading to distinct magnetic ground states based on the different schemes. We further investigate the associated magnetic exchange interactions and compare our results with beyond-DFT methods.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 7-14"},"PeriodicalIF":2.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366518","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

Selective hydrogen molecule dissociation on Ca2N monolayer 氢分子在Ca2N单层上的选择性解离

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-18 DOI: 10.1016/j.cap.2025.06.009

Gwan Woo Kim , Soonmin Jang , Gunn Kim

{"title":"Selective hydrogen molecule dissociation on Ca2N monolayer","authors":"Gwan Woo Kim , Soonmin Jang , Gunn Kim","doi":"10.1016/j.cap.2025.06.009","DOIUrl":"10.1016/j.cap.2025.06.009","url":null,"abstract":"<div><div>The development of efficient hydrogen conversion and storage technologies is critical for sustainable energy systems. We report the remarkable discovery of barrierless hydrogen dissociation on dicalcium nitride (Ca<sub>2</sub>N) monolayers through density functional theory calculations and ab initio molecular dynamics simulations. Our investigations reveal that molecular hydrogen adsorption occurs exclusively at a bridge site between calcium atoms (site B), while dissociated hydrogen atoms preferentially migrate to a calcium-centered hollow site (site A). Importantly, our simulations demonstrate a self-regulating mechanism wherein initial H<sub>2</sub> dissociation at B-sites inhibits subsequent molecular hydrogen adsorption, effectively controlling the dissociation process. The absence of an activation energy barrier indicates an exceptionally favorable thermodynamic pathway for hydrogen dissociation under ambient conditions. These findings establish pristine Ca<sub>2</sub>N monolayers as promising candidates for catalyzing hydrogen evolution reactions and other hydrogen-related energy applications, offering a novel direction for the development of electride-based catalysts with unprecedented hydrogen activation properties.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 15-23"},"PeriodicalIF":2.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480361","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

Strain-dependent charge density wave stability in monolayer Kagome AV3Sb5 (A = K, Rb, Cs) Kagome AV3Sb5单层膜应变相关电荷密度波稳定性（A = K, Rb, Cs）

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-17 DOI: 10.1016/j.cap.2025.06.008

Jun-Hee Im , Chang-Jong Kang , Chang-Youn Moon

引用次数: 0

Study on the effect of different crystal forms of benzamide on the luminescence properties of Mn2+ in organic-inorganic hybrid metal halides 苯甲酰胺不同晶型对有机-无机杂化金属卤化物中Mn2+发光性能影响的研究

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-13 DOI: 10.1016/j.cap.2025.06.007

Mengyu Guan, Ranran Bu, Haizhen Song, Changyuan Xu, Yichao Wang, Yan Zhang, Hongming Yin

引用次数: 0

Revealing the anisotropies in elasticity, sound velocities and thermal conductivities of o-HfO2: A density functional theory investigation 揭示o-HfO2弹性、声速和导热系数的各向异性：密度泛函理论研究

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-11 DOI: 10.1016/j.cap.2025.06.003

Cheng-Di Qi , Jian-Li Ma , Ze-Qing Guo , Wei-Wen Wang , Qun Wei

引用次数: 0

The significant improvements of DC magnetron sputtering plasma source via cryogenic cooling method for spintronics applications 低温冷却方法对自旋电子学应用中直流磁控溅射等离子体源的显著改进

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-09 DOI: 10.1016/j.cap.2025.06.004

Joonwoo Kim , Jaehun Cho , Si-Ho Oh , June-Seo Kim

{"title":"The significant improvements of DC magnetron sputtering plasma source via cryogenic cooling method for spintronics applications","authors":"Joonwoo Kim , Jaehun Cho , Si-Ho Oh , June-Seo Kim","doi":"10.1016/j.cap.2025.06.004","DOIUrl":"10.1016/j.cap.2025.06.004","url":null,"abstract":"<div><div>This study investigates the significant enhancement of DC magnetron sputtering plasma sources using a cryogenic cooling system to focus on its impact on thin-film deposition processes. The efficiency of magnetron-sputtering plasma sources directly depends on the in-plane magnetic fields, which are generated by permanent magnets installed inside the plasma source head. However, the permanent magnets are severely deteriorated when the system temperature is increased due to the plasma ignitions. In this case, the cryogenic cooling system effectively overcomes this limitation and it can improve the magnetic flux density and performance stability of the plasma source. Experimental results demonstrate that cryogenic cooling enhances deposition rates and film uniformity for both ferromagnetic (cobalt) and non-magnetic (tungsten) materials. Cobalt (Co) and tungsten (W) targets serve as representative examples, with deposition rates improving by approximately 27 % and 19 %, and uniformities increasing by 18 % and 19 %, respectively, compared to water-cooled systems. Additionally, the cryogenic cooling method allows for the use of thicker ferromagnetic targets that the magnetic target thickness limit is widely extended to 5.0 mm, which can reduce maintenance costs and process interruptions. From the systematic numerical simulations, one can be revealed that a strong magnetic field distortion due to a thin magnetic target is observed and it can occur the degradation of the efficiency of the plasma source. Moreover, the in-plane magnetic fields from permanent magnets are dramatically increased with decreasing the system temperatures. This study can highlight that the cryogenic cooling method of the magnetron sputtering plasma source is a transformative technology to improve the efficiency and reliability of the thin film deposition process for spintronic devices.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"77 ","pages":"Pages 100-107"},"PeriodicalIF":2.4,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262878","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