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Rationalizing the impact of oxygen vacancy on polysulfide conversion kinetics for highly efficient lithium-sulfur batteries 被引量:2
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作者 Ya Song Huan Li +3 位作者 Junfeng Li Jinyu An Jiao-Jing Shao Guangmin Zhou 《Journal of Energy Chemistry》 SCIE EI CSCD 2023年第12期51-60,I0003,共11页
The“shuttle effect”of lithium polysulfides(LiPSs)is a huge challenge for practical use of high-energydensity lithium-sulfur(Li-S)batteries,and one of the main reasons is the sluggish kinetics of sulfur conversion.Me... The“shuttle effect”of lithium polysulfides(LiPSs)is a huge challenge for practical use of high-energydensity lithium-sulfur(Li-S)batteries,and one of the main reasons is the sluggish kinetics of sulfur conversion.Metal oxides are able to expedite the sulfur electrochemistry,and the structural defects enhance the adsorption-conversion ability of metal oxides for polysulfides.However,a significant research gap still remains regarding the relationship between the oxygen vacancy concentration and the adsorptivecatalytic performance of metal oxides.Herein,we establish a correlation between oxygen vacancy concentration and adsorptive-catalytic properties by using tungsten oxide(WO_(x))as model catalysts.It is revealed that high-concentration oxygen vacancy is beneficial for enhancing the binding between tungsten oxide and LiPSs,reducing the energy barrier of Li_(2)S decomposition,and promoting polysulfide conversion kinetics.Consequently,the Li-S batteries using the tungsten oxide with high-concentration oxygen vacancies deliver high initial discharge capacity of 1169 mA h g^(-1)at 0.2 C and 865 mA h g^(-1)at 2 C,low attenuation rate of 0.064%per cycle over 1100 cycles at 2 C.With a high sulfur area loading of 5.34 mg cm^(-2),the Li-S batteries still exhibit high initial gravimetric capacity of 982 mA h g^(-1)at 0.1 C and areal capacity of 5.92 mA h cm^(-2).This work promotes the feasibility of defect engineering on metal oxides as an effective mean to enhance the practicality of Li-S batteries. 展开更多
关键词 Shuttl eeffect Oxygen vacancy INTERLAYER Lithium-sulfur batteries
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快速响应的NV色心微波传感器实现及测量
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作者 张家璇 刘鑫 +2 位作者 张立婷 李中豪 温焕飞 《传感器与微系统》 CSCD 北大核心 2024年第5期158-160,共3页
高精度微波快速测量技术是电磁频谱分析监测的核心,微波测量技术为微波传感器的高精度测量提供了可能。通过建立NV色心空间磁场能级响应频率精密调谐模型,结合NV色心光学宽场成像技术,实现了高精度、响应快可调的微波测量。首先,通过连... 高精度微波快速测量技术是电磁频谱分析监测的核心,微波测量技术为微波传感器的高精度测量提供了可能。通过建立NV色心空间磁场能级响应频率精密调谐模型,结合NV色心光学宽场成像技术,实现了高精度、响应快可调的微波测量。首先,通过连续光探测磁共振(ODMR)技术,结合宽场成像技术,通过像素级磁场强度-微波频率转化关系,实现宽场成像的微波测量;进而将连续扫频技术转变为施加定频进行检测,通过同步监测频点不同的响应特性,验证了测试结果的有效性。以上结果为高精度固态量子频谱分析仪、高瞬时带宽频谱微波传感器提供了重要技术基础。 展开更多
关键词 微波检测 磁场调谐 nv色心 光探测磁共振技术
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Efficient electrocatalytic conversion of N_(2) to NH_(3) using oxygen-rich vacancy lithium niobate cubes 被引量:1
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作者 Shuhui Fan Qi Wang +3 位作者 Yanan Hu Qiang Zhao Jinping Li Guang Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第10期132-138,共7页
Instead of the energy-intensive Haber-Bosch process,the researchers proposed a way to produce ammonia using water and nitrogen as feedstock,powered by electricity,without polluting the environment.Nevertheless,how to ... Instead of the energy-intensive Haber-Bosch process,the researchers proposed a way to produce ammonia using water and nitrogen as feedstock,powered by electricity,without polluting the environment.Nevertheless,how to design efficient electrocatalyst for electrocatalytic nitrogen reduction reaction(NRR)is still urgent and challenging.Herein,a strategy is proposed to adjust the morphology and surface electronic structure of electrocatalyst by optimizing material synthesis method.LiNbO3(lithium niobate,LN)cubes with oxygen-rich vacancy and regular morphology were synthesized by hydrothermal synthesis and followed molten salt calcination process,which were used for electrocatalytic NRR under mild conditions.Compared with LN nanoparticles synthesized by solid phase reaction,LN cubes exhibit better NRR performance,with the highest ammonia yield rate(13.74μg.h^(-1).mg^(-1))at the best potential of-0.45V(vs.reversible hydrogen electrode,RHE)and the best Faradaic efficiency(85.43%)at-0.4 V.Moreover,LN cubes electrocatalyst also demonstrates high stability in 7 cycles and 18 h current-time tests.Further investigation of the reaction mechanism confirmed that the structure of oxygen vacancy could adjust the electronic structure of the electrocatalyst,which was conducive to the adsorption and activation of N_(2) molecule and also increased the ECSA of electrocatalyst,thus providing more active sites for the NRR process. 展开更多
关键词 Nitrogen reduction reaction Ammonia yield rate Oxygen vacancy LiNbO_(3)cubes Electronic structure
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近红外光调制下金刚石NV色心自旋动力学与电荷态转化研究
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作者 翟云鹏 钱鹏 +2 位作者 胡钧 马钰 张恒 《合肥工业大学学报(自然科学版)》 CAS 北大核心 2024年第3期422-427,共6页
对金刚石氮-空位(nitrogen-vacancy,NV)色心电子自旋态进行光学操控的过程中,近红外光是一种重要手段,对色心自旋态和电荷态布居能产生显著影响,定量研究近红外光对NV色心自旋动力学的作用具有重要意义。文章用实验测量室温下532 nm激... 对金刚石氮-空位(nitrogen-vacancy,NV)色心电子自旋态进行光学操控的过程中,近红外光是一种重要手段,对色心自旋态和电荷态布居能产生显著影响,定量研究近红外光对NV色心自旋动力学的作用具有重要意义。文章用实验测量室温下532 nm激光连续激发单个NV色心产生的荧光时间曲线,并建立七能级模型进行数值模拟,得到各自旋能级间跃迁速率;在此基础上用1040 nm激光对色心荧光时间曲线进行调制,实验数据与数值模拟结果相吻合。研究结果表明,近红外光对金刚石NV色心自旋态的影响主要体现在对电荷态转化速率的提高上,使用功率为40 mW的1040 nm激光和532 nm激光一起照射,可以将电离速率和复合速率分别提升约15倍和30倍。 展开更多
关键词 金刚石氮-空位(nv)色心 自旋动力学 电荷态 近红外激光 数值模拟
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DLC膜对金刚石纳米柱NV色心发光收集强度的影响
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作者 李文斌 谭心 +2 位作者 潘超 贺占清 杨桥 《量子电子学报》 CAS CSCD 北大核心 2024年第5期793-801,共9页
金刚石氮空位(NV)色心发光收集强度的提高是实现单光子源技术的关键。本工作将锥状的类金刚石(DLC)梯度减反膜引入纳米柱色心单光子源中,旨在从色心的自发辐射速率与光子收集效率两方面提高NV色心的发光收集强度。采用时域有限差分(FDTD... 金刚石氮空位(NV)色心发光收集强度的提高是实现单光子源技术的关键。本工作将锥状的类金刚石(DLC)梯度减反膜引入纳米柱色心单光子源中,旨在从色心的自发辐射速率与光子收集效率两方面提高NV色心的发光收集强度。采用时域有限差分(FDTD)法对带有DLC膜的金刚石纳米柱复合结构进行了光学仿真,探究了不同结构参数的DLC薄膜对金刚石纳米柱NV色心光子收集强度、出射效率及自发辐射速率的影响,并且通过优化得到了最大收集强度下的结构参数。仿真结果表明,引入DLC膜能够使金刚石纳米柱中NV色心获得更高的光子出射效率(≥1%),并且能够改变纳米柱内部电场分布,使色心自发辐射速率增加16.8%,最终使光子的总收集强度增加15.5%。 展开更多
关键词 量子光学 收集强度 时域有限差分 金刚石纳米柱nv色心 类金刚石梯度减反膜 自发辐射速率
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Precisely Control Relationship between Sulfur Vacancy and H Absorption for Boosting Hydrogen Evolution Reaction 被引量:1
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作者 Jing Jin Xinyao Wang +4 位作者 Yang Hu Zhuang Zhang Hongbo Liu Jie Yin Pinxian Xi 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第4期14-24,共11页
Ef fective and robust catalyst is the core of water splitting to produce hydrogen.Here, we report an anionic etching method to tailor the sulfur vacancy(VS) of NiS_(2) to further enhance the electrocatalytic performan... Ef fective and robust catalyst is the core of water splitting to produce hydrogen.Here, we report an anionic etching method to tailor the sulfur vacancy(VS) of NiS_(2) to further enhance the electrocatalytic performance for hydrogen evolution reaction(HER). With the VS concentration change from 2.4% to 8.5%, the H* adsorption strength on S sites changed and NiS_(2)-VS 5.9% shows the most optimized H* adsorption for HER with an ultralow onset potential(68 m V) and has long-term stability for 100 h in 1 M KOH media. In situ attenuated-total-reflection Fourier transform infrared spectroscopy(ATR-FTIRS) measurements are usually used to monitor the adsorption of intermediates. The S-H* peak of the Ni S_(2)-VS 5.9% appears at a very low voltage, which is favorable for the HER in alkaline media. Density functional theory calculations also demonstrate the Ni S_(2)-VS 5.9% has the optimal |ΔG^(H*)| of 0.17 e V. This work offers a simple and promising pathway to enhance catalytic activity via precise vacancies strategy. 展开更多
关键词 Hydrogen evolution reaction S vacancies NANOSHEET H Adsorption
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Unsaturated bi-heterometal clusters in metal-vacancy sites of 2D MoS2 for efficient hydrogen evolution 被引量:1
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作者 Gonglei Shao Jie Xu +4 位作者 Shasha Gao Zhang Zhang Song Liu Xu Zhang Zhen Zhou 《Carbon Energy》 SCIE EI CAS CSCD 2024年第3期264-275,共12页
The valence states and coordination structures of doped heterometal atoms in two-dimensional(2D)nanomaterials lack predictable regulation strategies.Hence,a robust method is proposed to form unsaturated heteroatom clu... The valence states and coordination structures of doped heterometal atoms in two-dimensional(2D)nanomaterials lack predictable regulation strategies.Hence,a robust method is proposed to form unsaturated heteroatom clusters via the metal-vacancy restraint mechanism,which can precisely regulate the bonding and valence state of heterometal atoms doped in 2D molybdenum disulfide.The unsaturated valence state of heterometal Pt and Ru cluster atoms form a spatial coordination structure with Pt–S and Ru–O–S as catalytically active sites.Among them,the strong binding energy of negatively charged suspended S and O sites for H+,as well as the weak adsorption of positively charged unsaturated heterometal atoms for H*,reduces the energy barrier of the hydrogen evolution reaction proved by theoretical calculation.Whereupon,the electrocatalytic hydrogen evolution performance is markedly improved by the ensemble effect of unsaturated heterometal atoms and highlighted with an overpotential of 84 mV and Tafel slope of 68.5 mV dec^(−1).In brief,this metal vacancy-induced valence state regulation of heterometal can manipulate the coordination structure and catalytic activity of heterometal atoms doped in the 2D atomic lattice but not limited to 2D nanomaterials. 展开更多
关键词 CLUSTERS hydrogen evolution reaction metal vacancy MOS2 unsaturated heterometal
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Boosting Hydrogen Storage Performance of MgH_(2) by Oxygen Vacancy-Rich H-V_(2)O_(5) Nanosheet as an Excited H-Pump 被引量:2
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作者 Li Ren Yinghui Li +4 位作者 Zi Li Xi Lin Chong Lu Wenjiang Ding Jianxin Zou 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第8期398-416,共19页
MgH_(2) is a promising high-capacity solid-state hydrogen storage material,while its application is greatly hindered by the high desorption temperature and sluggish kinetics.Herein,intertwined 2D oxygen vacancy-rich V... MgH_(2) is a promising high-capacity solid-state hydrogen storage material,while its application is greatly hindered by the high desorption temperature and sluggish kinetics.Herein,intertwined 2D oxygen vacancy-rich V_(2)O_(5) nanosheets(H-V_(2)O_(5))are specifically designed and used as catalysts to improve the hydrogen storage properties of MgH_(2).The as-prepared MgH_(2)-H-V_(2)O_(5) composites exhibit low desorption temperatures(Tonset=185℃)with a hydrogen capacity of 6.54 wt%,fast kinetics(Ea=84.55±1.37 kJ mol^(-1) H_(2) for desorption),and long cycling stability.Impressively,hydrogen absorption can be achieved at a temperature as low as 30℃ with a capacity of 2.38 wt%within 60 min.Moreover,the composites maintain a capacity retention rate of~99%after 100 cycles at 275℃.Experimental studies and theoretical calculations demonstrate that the in-situ formed VH_(2)/V catalysts,unique 2D structure of H-V_(2)O_(5) nanosheets,and abundant oxygen vacancies positively contribute to the improved hydrogen sorption properties.Notably,the existence of oxygen vacancies plays a double role,which could not only directly accelerate the hydrogen ab/de-sorption rate of MgH_(2),but also indirectly affect the activity of the catalytic phase VH_(2)/V,thereby further boosting the hydrogen storage performance of MgH_(2).This work highlights an oxygen vacancy excited“hydrogen pump”effect of VH_(2)/V on the hydrogen sorption of Mg/MgH_(2).The strategy developed here may pave a new way toward the development of oxygen vacancy-rich transition metal oxides catalyzed hydride systems. 展开更多
关键词 Hydrogen storage MgH_(2) V_(2)O_(5)nanosheets Oxygen vacancies VH_(2)
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Effects of vacancy and external electric field on the electronic properties of the MoSi_(2)N_(4)/graphene heterostructure 被引量:1
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作者 梁前 罗祥燕 +3 位作者 钱国林 王远帆 梁永超 谢泉 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期542-550,共9页
Recently,the newly synthesized septuple-atomic layer two-dimensional(2D)material MoSi_(2)N_(4)(MSN)has attracted attention worldwide.Our work delves into the effect of vacancies and external electric fields on the ele... Recently,the newly synthesized septuple-atomic layer two-dimensional(2D)material MoSi_(2)N_(4)(MSN)has attracted attention worldwide.Our work delves into the effect of vacancies and external electric fields on the electronic properties of the MSN/graphene(Gr)heterostructure using first-principles calculation.We find that four types of defective structures,N-in,N-out,Si and Mo vacancy defects of monolayer MSN and MSN/Gr heterostructure are stable in air.Moreover,vacancy defects can effectively modulate the charge transfer at the interface of the MSN/Gr heterostructure as well as the work function of the pristine monolayer MSN and MSN/Gr heterostructure.Finally,the application of an external electric field enables the dynamic switching between n-type and p-type Schottky contacts.Our work may offer the possibility of exceeding the capabilities of conventional Schottky diodes based on MSN/Gr heterostructures. 展开更多
关键词 MoSi_(2)N_(4) vacancy defects external electric field Schottky contacts
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Investigating the impact of dynamic structural changes of Au/rutile catalysts on the catalytic activity of CO oxidation 被引量:1
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作者 Xiaochun Hu Qianwenhao Fan +9 位作者 Mingwu Tan Yuqing Luo Xianyue Wu Manoel Y.Manuputty Jie Ding Tej S.Choksi Markus Kraft Rong Xu Zhiqiang Sun Wen Liu 《Carbon Energy》 SCIE EI CAS CSCD 2024年第4期222-232,共11页
The surface properties of oxidic supports and their interaction with the supported metals play critical roles in governing the catalytic activities of oxide‐supported metal catalysts.When metals are supported on redu... The surface properties of oxidic supports and their interaction with the supported metals play critical roles in governing the catalytic activities of oxide‐supported metal catalysts.When metals are supported on reducible oxides,dynamic surface reconstruction phenomena,including strong metal–support interaction(SMSI)and oxygen vacancy formation,complicate the determination of the structural–functional relationship at the active sites.Here,we performed a systematic investigation of the dynamic behavior of Au nanocatalysts supported on flame‐synthesized TiO_(2),which takes predominantly a rutile phase,using CO oxidation above room temperature as a probe reaction.Our analysis conclusively elucidated a negative correlation between the catalytic activity of Au/TiO_(2) and the oxygen vacancy at the Au/TiO_(2) interface.Although the reversible formation and retracting of SMSI overlayers have been ubiquitously observed on Au/TiO_(2) samples,the catalytic consequence of SMSI remains inconclusive.Density functional theory suggests that the electron transfer from TiO_(2) to Au is correlated to the presence of the interfacial oxygen vacancies,retarding the catalytic activation of CO oxidation. 展开更多
关键词 CO oxidation electronic metal-support interactions flame‐synthesis metal-support interactions oxygen vacancy strong metal-support interaction
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High-efficiency sodium storage of Co_(0.85)Se/WSe_(2) encapsulated in N-doped carbon polyhedron via vacancy and heterojunction engineering 被引量:2
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作者 Ya Ru Pei Hong Yu Zhou +5 位作者 Ming Zhao Jian Chen Li Xin Ge Wei Zhang Chun Cheng Yang Qing Jiang 《Carbon Energy》 SCIE EI CAS CSCD 2024年第1期94-107,共14页
With the advantage of fast charge transfer,heterojunction engineering is identified as a viable method to reinforce the anodes'sodium storage performance.Also,vacancies can effectively strengthen the Na+adsorption... With the advantage of fast charge transfer,heterojunction engineering is identified as a viable method to reinforce the anodes'sodium storage performance.Also,vacancies can effectively strengthen the Na+adsorption ability and provide extra active sites for Na+adsorption.However,their synchronous engineering is rarely reported.Herein,a hybrid of Co_(0.85)Se/WSe_(2) heterostructure with Se vacancies and N-doped carbon polyhedron(CoWSe/NCP)has been fabricated for the first time via a hydrothermal and subsequent selenization strategy.Spherical aberration-corrected transmission electron microscopy confirms the phase interface of the Co_(0.85)Se/WSe_(2) heterostructure and the existence of Se vacancies.Density functional theory simulations reveal the accelerated charge transfer and enhanced Na+adsorption ability,which are contributed by the Co_(0.85)Se/WSe_(2) heterostructure and Se vacancies,respectively.As expected,the CoWSe/NCP anode in sodium-ion battery achieves outstanding rate capability(339.6 mAh g^(−1) at 20 A g^(−1)),outperforming almost all Co/W-based selenides. 展开更多
关键词 Co_(0.85)Se/WSe_(2)heterostructure density functional theory simulations N-doped carbon polyhedron Se vacancies sodium-ion batteries
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采用磁屏蔽环结构的金刚石NV色心全光直流互感器系统
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作者 王鑫 赵龙 +5 位作者 仇茹嘉 宋东波 田腾 耿佳琪 赵博文 苏帅 《微纳电子技术》 CAS 2024年第5期93-101,共9页
针对目前电力系统对电流互感器的精度与灵敏度提出的更高要求,提出了一种基于金刚石氮-空位(NV)色心的全光直流互感器的系统方案,系统包括光源模块、激光反馈模块、激光分束模块、一次传感探头模块、激光分频模块、光电转换模块以及信... 针对目前电力系统对电流互感器的精度与灵敏度提出的更高要求,提出了一种基于金刚石氮-空位(NV)色心的全光直流互感器的系统方案,系统包括光源模块、激光反馈模块、激光分束模块、一次传感探头模块、激光分频模块、光电转换模块以及信号采集和数据处理模块。对系统中的磁屏蔽环进行了结构的设计与仿真,并对仿真结果进行了实验验证。最后搭建了单通道实验验证系统,系统实测结果表明,设计的全光直流互感器在5 000 A大电流下无磁屏蔽时可以达到0.35%的测量精度,加入磁屏蔽环后测量精度提升到了0.06%,从而为基于金刚石NV色心的全光直流互感器的研制提供了参考。 展开更多
关键词 金刚石 氮-空位(nv)色心 直流互感器 量子精密测量 磁屏蔽环
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基于深度学习的NV色心轴向快速识别
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作者 张文超 徐南阳 +1 位作者 刘玉山 周明媞 《合肥工业大学学报(自然科学版)》 CAS 北大核心 2024年第11期1481-1485,1492,共6页
文章提出一种利用NV色心的角向偏振光成像图快速确定NV色心轴向的深度学习方法。NV色心的光致发光特性与排列在垂直于NV色心对称轴平面上的2个正交偶极子有关,利用角向偏振光可以得到NV轴对应的正交光学偶极子的成像图;通过数字仿真可... 文章提出一种利用NV色心的角向偏振光成像图快速确定NV色心轴向的深度学习方法。NV色心的光致发光特性与排列在垂直于NV色心对称轴平面上的2个正交偶极子有关,利用角向偏振光可以得到NV轴对应的正交光学偶极子的成像图;通过数字仿真可以模拟不同NV轴向在角向偏振光作用下的成像图案,以此构建数据集并搭建神经网络进行学习;将神经网络模型作为NV成像图和其轴向之间的映射,从而根据给定的成像图直接得出NV色心的部分轴向值,再依据金刚石晶格中的角度约束关系,得到金刚石中NV色心的完整轴向。基于NV色心的角向偏振光成像图,在保证识别精度的前提下,实现对NV轴向的实时确定,提高以NV轴向为前置条件的各项工作(如磁场重构等)的效率。 展开更多
关键词 nv色心 角向偏振光 神经网络 轴向识别 金刚石晶格
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Engineering of oxygen vacancy and bismuth cluster assisted ultrathin Bi_(12)O_(17)Cl_(2)nanosheets with efficient and selective photoreduction of CO_(2)to CO 被引量:1
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作者 Meili Guan Ni Lu +7 位作者 Xuan Zhang Qiuwan Wang Jian Bao Guiye Chen Hao Yu Huaming Li Jiexiang Xia Xuezhong Gong 《Carbon Energy》 SCIE EI CAS CSCD 2024年第4期1-11,共11页
The photocatalytic conversion of CO_(2)into solar‐powered fuels is viewed as a forward‐looking strategy to address energy scarcity and global warming.This work demonstrated the selective photoreduction of CO_(2)to C... The photocatalytic conversion of CO_(2)into solar‐powered fuels is viewed as a forward‐looking strategy to address energy scarcity and global warming.This work demonstrated the selective photoreduction of CO_(2)to CO using ultrathin Bi_(12)O_(17)Cl_(2)nanosheets decorated with hydrothermally synthesized bismuth clusters and oxygen vacancies(OVs).The characterizations revealed that the coexistences of OVs and Bi clusters generated in situ contributed to the high efficiency of CO_(2)–CO conversion(64.3μmol g^(−1)h^(−1))and perfect selectivity.The OVs on the facet(001)of the ultrathin Bi_(12)O_(17)Cl_(2)nanosheets serve as sites for CO_(2)adsorption and activation sites,capturing photoexcited electrons and prolonging light absorption due to defect states.In addition,the Bi‐cluster generated in situ offers the ability to trap holes and the surface plasmonic resonance effect.This study offers great potential for the construction of semiconductor hybrids as multiphotocatalysts,capable of being used for the elimination and conversion of CO_(2)in terms of energy and environment. 展开更多
关键词 Bi cluster Bi_(12)O_(17)Cl_(2)nanosheet oxygen vacancy photocatalytic CO_(2)reduction
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基于金刚石NV色心的电流传感技术及其标准化研究初探
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作者 岑炜 白静芬 +3 位作者 孟静 李琪林 吕英杰 段永贤 《计量学报》 CSCD 北大核心 2024年第10期1462-1469,共8页
为推进量子化电流传感技术的落地应用,探讨了基于金刚石NV色心的电流传感技术,初步研究了其标准化技术。首先,介绍了金刚石NV色心的结构和物理特性,分析了基于金刚石NV色心的光学特性及自旋量子相干性的电流传感测量原理,研究了磁噪声... 为推进量子化电流传感技术的落地应用,探讨了基于金刚石NV色心的电流传感技术,初步研究了其标准化技术。首先,介绍了金刚石NV色心的结构和物理特性,分析了基于金刚石NV色心的光学特性及自旋量子相干性的电流传感测量原理,研究了磁噪声抑制、磁测量灵敏度提升和测量芯片小型化等实用化技术;然后,分析了基于金刚石NV色心的电流传感测量技术的技术优势和标准化需求,提出了标准体系建设建议,为基于金刚石NV色心的电流传感技术研究、设备研制及传感测量系统落地应用提供技术支撑。 展开更多
关键词 电学计量 电流传感技术 金刚石nv色心 量子化测量 标准化
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金刚石NV色心磁力仪测磁性能优化
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作者 耿佳琪 赵龙 +2 位作者 仇如嘉 柯艳国 赵博文 《电子测量技术》 北大核心 2024年第17期115-122,共8页
金刚石NV色心以其高磁场灵敏度、常温工作等优势成为一种非常有前景的磁场传感器。本文介绍了NV色心测磁原理,设计并搭建了基于NV色心的磁测量系统,通过激光-荧光差分光路将噪声降低至约1/8,使用微波混频调制方法将ODMR谱线斜率提升2.5... 金刚石NV色心以其高磁场灵敏度、常温工作等优势成为一种非常有前景的磁场传感器。本文介绍了NV色心测磁原理,设计并搭建了基于NV色心的磁测量系统,通过激光-荧光差分光路将噪声降低至约1/8,使用微波混频调制方法将ODMR谱线斜率提升2.5倍左右,最终基于NV色心浓度<300 ppb的金刚石样品实现了0.934 nT/Hz^(1/2)的磁场测量灵敏度。同时设计了基于双微波调制解调的NV测磁系统,并在10 kHz采样率下实现了1.76×10^(-4)的测量不确定度,基于阿伦方差分析方法,在0.2 s统计时间条件下测量不确定度达到10 ppm。 展开更多
关键词 金刚石nv色心 灵敏度 磁力仪
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Preparing highly entangled states of nanodiamond rotation and NV center spin
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作者 李文亮 周端陆 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第2期144-151,共8页
A nanodiamond with an embedded nitrogen-vacancy(NV)center is one of the experimental systems that can be coherently manipulated within current technologies.Entanglement between NV center electron spin and mechanical r... A nanodiamond with an embedded nitrogen-vacancy(NV)center is one of the experimental systems that can be coherently manipulated within current technologies.Entanglement between NV center electron spin and mechanical rotation of the nanodiamond plays a fundamental role in building a quantum network connecting these microscopic and mesoscopic degrees of motions.Here we present a protocol to asymptotically prepare a highly entangled state of the total quantum angular momentum and electron spin by adiabatically boosting the external magnetic field. 展开更多
关键词 NANODIAMOND nv center ENTANGLEMENT
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Impact of Transition Metal Layer Vacancy on the Structure and Performance of P2 Type Layered Sodium Cathode Material
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作者 Orynbay Zhanadilov Sourav Baiju +7 位作者 Natalia Voronina Jun Ho Yu A.-Yeon Kim Hun‑Gi Jung Kyuwook Ihm Olivier Guillon Payam Kaghazchi Seung‑Taek Myung 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第11期340-358,共19页
This study explores the impact of introducing vacancy in the transition metal layer of rationally designed Na_(0.6)[Ni_(0.3)Ru_(0.3)Mn_(0.4)]O_(2)(NRM)cathode material.The incorporation of Ru,Ni,and vacancy enhances t... This study explores the impact of introducing vacancy in the transition metal layer of rationally designed Na_(0.6)[Ni_(0.3)Ru_(0.3)Mn_(0.4)]O_(2)(NRM)cathode material.The incorporation of Ru,Ni,and vacancy enhances the structural stability during extensive cycling,increases the operation voltage,and induces a capacity increase while also activating oxygen redox,respectively,in Na_(0.7)[Ni_(0.2)V_(Ni0.1)Ru_(0.3)Mn_(0.4)]O_(2)(V-NRM)compound.Various analytical techniques including transmission electron microscopy,X-ray absorption near edge spectroscopy,operando X-ray diffraction,and operando differential electrochemical mass spectrometry are employed to assess changes in the average oxidation states and structural distortions.The results demonstrate that V-NRM exhibits higher capacity than NRM and maintains a moderate capacity retention of 81%after 100 cycles.Furthermore,the formation of additional lone-pair electrons in the O 2p orbital enables V-NRM to utilize more capacity from the oxygen redox validated by density functional calculation,leading to a widened dominance of the OP4 phase without releasing O_(2) gas.These findings offer valuable insights for the design of advanced high-capacity cathode materials with improved performance and sustainability in sodium-ion batteries. 展开更多
关键词 Layered oxide Oxygen evolution Sodium battery vacancy CATHODE
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Theoretical study of kinetic isotope effects for vacancy diffusion of impurity in solids
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作者 Yuxi Jing Xuefang Li Yun Liu 《Acta Geochimica》 EI CAS CSCD 2024年第5期959-970,共12页
Theoretical studies of the diffusionalisotope effect in solids are still stuck in the 1960s and 1970s.With the development of high spatial resolution mass spectrometers,isotopic data of mineral grains are rapidly accu... Theoretical studies of the diffusionalisotope effect in solids are still stuck in the 1960s and 1970s.With the development of high spatial resolution mass spectrometers,isotopic data of mineral grains are rapidly accumulated.To dig up information from these data,molecularlevel theoretical models are urgently needed.Based on the microscopic definition of the diffusion coe fficient(D),a new theoretical framework for calculating the diffusional isotope effect(DIE(v))(intermsofD*/D)forvacancy-mediated impurity diffusion in solids is provided based on statistical mechanics formalism.The newly derived equation shows that theDIE(v)can be easily calculated as long as the vibration frequencies of isotope-substituted solids are obtained.The calculatedDIE(v)values of^(199)Au/^(195)Au and^(60)Co/^(57)Co during diffusion in Cu and Au metals are all within 1%of errors compared to the experimental data,which shows that this theoretical model is reasonable and precise. 展开更多
关键词 vacancy diffusion Diffusional isotope effect Statistical mechanics
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Generation of macroscopic entanglement in ensemble systems based on silicon vacancy centers
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作者 Jian-Zhuang Wu Ying Xi +2 位作者 Bo-Ya Li Lian-E Lu Yong-Hong Ma 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第9期308-315,共8页
Entanglement in macroscopic systems,as a fundamental quantum resource,has been utilized to propel the advancement of quantum technology and probe the boundary between the quantum and classical realms.This study focuse... Entanglement in macroscopic systems,as a fundamental quantum resource,has been utilized to propel the advancement of quantum technology and probe the boundary between the quantum and classical realms.This study focuses on a unique hybrid quantum system comprising of an ensemble of silicon vacancy(SiV)centers coupled to phononic waveguides in diamond via strain interactions.By employing two sets of time-dependent,non-overlapping driving fields,we investigate the generation process and dynamic properties of macroscopic quantum entanglement,providing fresh insights into the behavior of such hybrid quantum systems.Furthermore,it paves the way for new possibilities in utilizing quantum entanglement as an information carrier in quantum information processing and quantum communication. 展开更多
关键词 quantum entanglement silicon vacancy centers diamond waveguide
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