Journal of Physics D: Applied Physics最新文献_第7页

Helium line emission spectroscopy to measure plasma parameters using modeling and machine learning in low temperature plasmas 在低温等离子体中利用建模和机器学习的氦线发射光谱测量等离子体参数

Journal of Physics D: Applied Physics Pub Date : 2024-07-08 DOI: 10.1088/1361-6463/ad6007

S. Kajita, D. Nishijima

{"title":"Helium line emission spectroscopy to measure plasma parameters using modeling and machine learning in low temperature plasmas","authors":"S. Kajita, D. Nishijima","doi":"10.1088/1361-6463/ad6007","DOIUrl":"https://doi.org/10.1088/1361-6463/ad6007","url":null,"abstract":"\u0000 Line intensity ratios (LIRs) of helium (He) atoms are known to depend on electron density, $n_{rm e}$, and temperature, $T_{rm e}$, and thus are widely utilized to evaluate these parameters, which is the so-called He I LIR method. In this conventional method, measured LIRs are compared with theoretical values calculated using a collisional-radiative (CR) model to find the best possible $n_{rm e}$ and $T_{rm e}$. Basic CR models have been improved to take into account several effects. For instance, radiation trapping can occur to a significant degree in weakly ionized plasmas, leading to major alterations of LIRs. This effect has been included with optical escape factors in CR models. A new approach to the evaluation of $n_{rm e}$ and $T_{rm e}$ from He I LIRs has recently been explored using machine learning (ML). In the ML-aided LIR method, a predictive model is developed with training data, which consist of input (measured LIRs) and desired/known output (measured $n_{rm e}$ or $T_{rm e}$ from other diagnostics). It has been demonstrated that this new method predicts $n_{rm e}$ and $T_{rm e}$ better than using the conventional method coupled with a CR model, not only for He but also for other species.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141669413","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}

引用次数: 0

Comparative study of sodium and potassium compounds as promoters for growth of monolayer MoS2 with high crystal quality on SiO2/Si substrate 钠和钾化合物作为在二氧化硅/硅衬底上生长高晶体质量单层 MoS2 的促进剂的比较研究

Journal of Physics D: Applied Physics Pub Date : 2024-07-08 DOI: 10.1088/1361-6463/ad6009

Jun Xiong, Qiang Wu, Xinwei Cai, Yiming Zhu, Guangyang Lin, Cheng Li

{"title":"Comparative study of sodium and potassium compounds as promoters for growth of monolayer MoS2 with high crystal quality on SiO2/Si substrate","authors":"Jun Xiong, Qiang Wu, Xinwei Cai, Yiming Zhu, Guangyang Lin, Cheng Li","doi":"10.1088/1361-6463/ad6009","DOIUrl":"https://doi.org/10.1088/1361-6463/ad6009","url":null,"abstract":"\u0000 Monolayer MoS2 is promising candidate for fabrication of optoelectronic devices due to its direct bandgap nature and high carrier mobility. Alkali metal compounds have been demonstrated to be helpful promoters for the growth of large single crystal monolayer MoS2 on SiO2/Si substrate. However, the catalytic mechanism of alkali metal compounds is still under debate. Herein, we compared the surface morphology, optical properties, and electrical properties of monolayer MoS2 flakes grown on SiO2/Si substrate assisted by promoters containing potassium or sodium cations and halogen (chlorine) or non-halogen (hydroxide) anions, i.e., NaCl, NaOH, KCl and KOH. Based on the analysis of existing growth mechanism, we proposed that the alkali metal cation, plays a dominant role in promoting the lateral growth of monolayer MoS2 and obtaining high crystal quality. Furthermore, potassium has a greater promoting effect than sodium. By optimizing growth conditions, monolayer triangular MoS2 flakes with large lateral size over 160 µm were grown assisted by KCl promoter. Raman and PL spectra verified excellent crystal quality of the flakes, with typical electron mobilities of 2.98 and 20 cm2·V-1·s-1 for the back-gated filed effect transistors fabricated on as-grown and fresh SiO2/Si substrates, respectively.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141670010","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}

引用次数: 0

Spatial analysis of multi-frequency SAW beams excited by slanted IDTs on ZnO-SiC heterostructures ZnO-SiC 异质结构上的斜 IDT 激发的多频 SAW 波束的空间分析

Journal of Physics D: Applied Physics Pub Date : 2024-07-08 DOI: 10.1088/1361-6463/ad600e

Y. Liou, Madeleine Msall, A. Hernández-Mínguez, P. V. Santos

引用次数: 0

Solid-mechanics analysis and modeling of the alloyed ohmic contact proximity in GaN HEMTs using µRaman spectroscopy 利用 µRaman 光谱对 GaN HEMT 中的合金欧姆接触邻近性进行固体力学分析和建模

Journal of Physics D: Applied Physics Pub Date : 2024-07-08 DOI: 10.1088/1361-6463/ad600b

Burak Güneş, B. Butun, Ekmel Özbay

引用次数: 0

On the thermodynamics of Barium Oxyfluoride precursor in YBCO growth via MOD process 关于通过 MOD 工艺生长 YBCO 的氟化钡前驱体的热力学

Journal of Physics D: Applied Physics Pub Date : 2024-07-08 DOI: 10.1088/1361-6463/ad600a

M. De Angelis, M. Tomellini

引用次数: 0

Study of the thermal characteristics of propellant tanks in microgravity and its application to propellant gauging 研究微重力状态下推进剂贮箱的热特性及其在推进剂测量中的应用

Journal of Physics D: Applied Physics Pub Date : 2024-07-08 DOI: 10.1088/1361-6463/ad600d

Zhoumo Zeng, Hexin Gao, Jin Zhang, Xiaobo Rui, Lei Qi, Yong Chen, Zongyu Wu, Yuhao Cui, Yao Yu, Yu Wu, Yu Zhang

引用次数: 0

Spectroscopy and microscopy characterizations of two-dimensional materials with Moiré superlattices 利用莫伊里超晶格对二维材料进行光谱学和显微学表征

Journal of Physics D: Applied Physics Pub Date : 2024-07-05 DOI: 10.1088/1361-6463/ad5f98

Zhenlai Wang, Mengjian Zhu

引用次数: 0

Ultra-thin size-controllable surface plasmon polariton laser by PDMS-assisted imprinting 通过 PDMS 辅助压印技术实现尺寸可控的超薄表面等离子体极化子激光器

Journal of Physics D: Applied Physics Pub Date : 2024-07-05 DOI: 10.1088/1361-6463/ad5f97

Jing Zhao, Runkang Lin, Jinyao Wang, Jiaqian Sun, Keqian Dong, Huayi Zou, Jiangying Lu, Jingteng Ma, Shudi Lu, Fangyuan Ma, Kong Liu, S. Yue, Zhijie Wang, S. Qu

{"title":"Ultra-thin size-controllable surface plasmon polariton laser by PDMS-assisted imprinting","authors":"Jing Zhao, Runkang Lin, Jinyao Wang, Jiaqian Sun, Keqian Dong, Huayi Zou, Jiangying Lu, Jingteng Ma, Shudi Lu, Fangyuan Ma, Kong Liu, S. Yue, Zhijie Wang, S. Qu","doi":"10.1088/1361-6463/ad5f97","DOIUrl":"https://doi.org/10.1088/1361-6463/ad5f97","url":null,"abstract":"\u0000 Plasmonic laser has great potential to overcome the optical diffraction limit, playing a crucial role in advancing nanophotonics and nanoelectronics for on-chip integration. However, current plasmonic lasers face several challenges, such as the difficulty in controlling nanowire size, disordered arrangement, and complicated fabrication process. Herein, ultra-thin gain media for plasmonic lasers below the cutoff size of the photonic mode are prepared using the PDMS-assisted imprinting. This method enables precise control over the size of the perovskite nanowire, with the minimum size achievable being 60 nm. As a result, the plasmonic lasing is achieved from the CsPbBr3 nanowire-based device with a threshold as low as ~49.13 μJ cm-2 and a Quality Factor (Q) of 1803 at room temperature, demonstrating its capability for achieving high-quality lasing. Meanwhile, a dual-pumping time-resolved fluorescence study suggests that the radiative recombination lifetime of CsPbBr3 nanowires is shortened by a factor of 10 due to the Purcell effect, confirming the plasmonic effect exhibited by the device. Furthermore, a plasmonic laser array is developed using this method, demonstrating the applicability of the imprinting method in complex graphic fabrication. This breakthrough provides a solution for the application of plasmonic laser arrays in optoelectronic integration.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141675017","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}

引用次数: 0

Surface DBD in moist air for nitrogen fixation: a comparative study of pulsed versus amplitude-modulated AC powered discharge 潮湿空气中用于固氮的表面 DBD：脉冲放电与调幅交流电放电的比较研究

Journal of Physics D: Applied Physics Pub Date : 2024-07-05 DOI: 10.1088/1361-6463/ad5f99

Jiří Fujera, P. Hoffer, V. Prukner, P. Rotondo, G. Arora, V. Jirásek, Petr Lukes, Milan Šimek

{"title":"Surface DBD in moist air for nitrogen fixation: a comparative study of pulsed versus amplitude-modulated AC powered discharge","authors":"Jiří Fujera, P. Hoffer, V. Prukner, P. Rotondo, G. Arora, V. Jirásek, Petr Lukes, Milan Šimek","doi":"10.1088/1361-6463/ad5f99","DOIUrl":"https://doi.org/10.1088/1361-6463/ad5f99","url":null,"abstract":"\u0000 Surface DBD discharge maintained in moist air in the immediate vicinity of the water surface is an effective source of reactive species for the production of plasma-activated water. In this work, we investigated the water activation process for two different DBD energization methods; i.e. using periodic HV pulses with nanosecond risetimes and amplitude-modulated HV AC. We combined UV-vis-NIR ICCD spectroscopy with electrical characteristics to determine the basic characteristics of surface DBD microfilaments. Formation of N2O5/NO2/N2O/H2O2/NO2-/NO3- species was followed and the production yields of species generated in plasma-activated water (H2O2/NO2-/NO3-) were determined in a flow-through reactor under well-defined and stable discharge conditions. Both energization methods reached comparable energy efficiencies of nitrogen fixation in the range of 1-6 g/kWh with minimal concentrations of H2O2 (10s µM). However, the AC-powered SDBD produced mainly NO3- with minimal NO2- (1/10 of NO3-), while in the case of pulsed SDBD the better-balanced NO2-/NO3- ratio was achieved.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141677012","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}

引用次数: 0

Biplanar Coils Design for Spatial Nonlinear Magnetic Fields Using An Enhanced Target Field Method 使用增强目标磁场法设计空间非线性磁场的双平面线圈

Journal of Physics D: Applied Physics Pub Date : 2024-07-05 DOI: 10.1088/1361-6463/ad5f9a

Shuai-Jie Yuan, Peiling Cui, Minxia Shi, Xu Zhang, Jianzhi Yang, Leran Zhang, Yuzheng Ma

引用次数: 0