Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Xing Xiangzhuo,Wang Chao,Yu Linchao,Xu Jie,Zhang Chutong,Zhang Mengge,Huang Song,Zhang Xiaoran,Liu Yunxian,Yang Bingchao,Chen Xin,Zhang Yongsheng,Guo Jiangang,Shi Zhixiang,Ma Yanming,Chen Changfeng,Liu Xiaobing
The recent report of near-ambient superconductivity and associated color changes in pressurized nitrogen doped lutetium hydride has triggered worldwide interest and raised major questions about the nature and underlying physics of these latest claims. Here we report synthesis and characterization of high-purity nitrogen doped lutetium hydride LuH 2± x N y . We find that pressure conditions have notable effects on Lu-N and Lu-NH chemical bonding and the color changes likely stem from pressure-induced electron redistribution of nitrogen/vacancies and interaction with the LuH 2 framework. No superconducting transition is found in all the phases at temperatures 1.8-300 K and pressures 0-38 GPa. Instead, we identify a notable temperature-induced resistance anomaly of electronic origin in LuH 2± x N y , which is most pronounced in the pink phase and may have been erroneously interpreted as a sign of superconducting transition. This work establishes key benchmarks for nitrogen doped lutetium hydrides, allowing an in-depth understanding of its novel pressure-induced phase changes.
研究领域:
材料科学
·
凝聚态物理
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DOI
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-9
·
IF 11.878
Ren Guang-Kun,Wang Shanyu,Zhou Zhifang,Li Xin,Yang Jiong,Zhang Wenqing,Lin Yuan-Hua,Yang Jihui,Nan Ce-Wen
BiCuSeO oxyselenides are promising thermoelectric materials, yet further thermoelectric figure of merit ZT improvement is largely limited by the inferior electrical transport properties. The established literature on these materials shows only one power factor maximum upon carrier concentration optimization, which is typical for most thermoelectric semiconductors. Surprisingly, we found three power factor maxima when doping Bi with Pb. Based on our first-principles calculations, numerical modeling, and experimental investigation, we attribute the three maxima to the Fermi energy optimization, band convergence, and compositing effect due to in situ formed PbSe precipitates. Consequently, three ZT peaks of 0.9, 1.1, and 1.3 at 873 K are achieved for 4, 10, and 14 at.% Pb-doped samples, respectively, revealing the significance of complex electronic structure and multiple roles of Pb in BiCuSeO. The results establish an accurate band structure characterization for BiCuSeO and identify the role of band convergence and nanoprecipitation as the driving mechanism for high ZT.
研究领域:
材料科学
·
物理学
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Zhang Xin,Bai Ruichen,Fu Yuhao,Hao Yingying,Peng Xinkai,Wang Jia,Ge Bangzhi,Liu Jianxi,Hu Yongcai,Ouyang Xiaoping,Jie Wanqi,Xu Yadong
α particles must be monitored to be managed as radioactive diagnostic agents or nuclear activity indicators. The new generation of perovskite detectors suffer from limited energy resolution, which affects spectroscopy and imaging applications. Here, we report that the solution-grown CsPbBr 3 crystal exhibits a low and stable dark current (34.6 nA·cm −2 at 200 V) by thinning the as-grown crystal to decrease the high concentration CsPb 2 Br 5 phase near the surface. The introduction of the Schottky electrode for the CsPbBr 3 detector further reduces the dark current and improves the high-temperature stability. An energy resolution of 6.9% is achieved with the commercial electronic system, while the effects of air scattering and absorption are investigated. Moreover, 1.1% energy resolution is recognized by a full-customized readout application-specific integrated circuit without any additional signal processing, which matches well with the given parameters of the CsPbBr 3 detector by reducing the parasitic capacitance and electronic noise.
研究领域:
材料科学
·
核技术应用
·
电子学
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Cheng Erjian,Xia Wei,Shi Xianbiao,Fang Hongwei,Wang Chengwei,Xi Chuanying,Xu Shaowen,Peets Darren C.,Wang Linshu,Su Hao,Pi Li,Ren Wei,Wang Xia,Yu Na,Chen Yulin,Zhao Weiwei,Liu Zhongkai,Guo Yanfeng,Li Shiyan
The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead to a variety of novel physics. We systematically studied the magnetic semimetal EuAs 3 , demonstrating a magnetism-induced topological transition from a topological nodal-line semimetal in the paramagnetic or the spin-polarized state to a topological massive Dirac metal in the antiferromagnetic ground state at low temperature. The topological nature in the antiferromagnetic state and the spin-polarized state has been verified by electrical transport measurements. An unsaturated and extremely large magnetoresistance of ~2 × 10 5 % at 1.8 K and 28.3 T is observed. In the paramagnetic states, the topological nodal-line structure at the Y point is proven by angle-resolved photoemission spectroscopy. Moreover, a temperature-induced Lifshitz transition accompanied by the emergence of a new band below 3 K is revealed. These results indicate that magnetic EuAs 3 provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology.
研究领域:
凝聚态物理
·
材料科学
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DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Jin Chengbin,Huang Yiyu,Li Lanhang,Wei Guoying,Li Hongyan,Shang Qiyao,Ju Zhijin,Lu Gongxun,Zheng Jiale,Sheng Ouwei,Tao Xinyong
Reactive negative electrodes like lithium (Li) suffer serious chemical and electrochemical corrosion by electrolytes during battery storage and operation, resulting in rapidly deteriorated cyclability and short lifespans of batteries. Li corrosion supposedly relates to the features of solid-electrolyte-interphase (SEI). Herein, we quantitatively monitor the Li corrosion and SEI progression (e.g., dissolution, reformation) in typical electrolytes through devised electrochemical tools and cryo-electron microscopy. The continuous Li corrosion is validated to be positively correlated with SEI dissolution. More importantly, an anti-corrosion and interface-stabilizing artificial passivation layer comprising low-solubility polymer and metal fluoride is designed. Prolonged operations of Li symmetric cells and Li | |LiFePO 4 cells with reduced Li corrosion by ~74% are achieved (0.66 versus 2.5 μAh h −1 ). The success can further be extended to ampere-hour-scale pouch cells. This work uncovers the SEI dissolution and its correlation with Li corrosion, enabling the durable operation of Li metal batteries by reducing the Li loss.
研究领域:
材料科学
·
电化学
·
电池技术
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高影响因子
PHYSICS AND CHEMISTRY OF MINERALS
·
2026
·Vol. 53
·期 1
·2
·
IF 1.6
He Jinze,Liu Zhaodong,Ishii Takayuki
An alumina-rich silicate phase of calcium ferrite-type (CF) phase is a major mineral in crustal rocks subducted into the lower mantle. However, its chemical composition with increasing pressure and temperature remains unclear yet. In this study, phase relations in the CaAl 2 O 4 -MgAl 2 O 4 system were determined at 15–25 GPa and 1100–2000 °C by using a multi-anvil apparatus. In the pressure-temperature range, CaAl 2 O 4 -rich CF phase coexisted with another alumina-rich silicate of hexagonal (NAL) phase in the (1-x)CaAl 2 O 4 -xMgAl 2 O 4 system (x = 5–70 mol%). The solubility of the MgAl 2 O 4 component in the CF phase increases with pressure and temperature, from 3.8 mol% to 23.9 mol%, while the composition of the NAL phase was almost constant. In the MgAl 2 O 4 -rich system, we found that almost no CaO was incorporated into MgAl 2 O 4 phases in the present pressure-temperature range. MgAl 2 O 4 spinel (Sp) transformed to decomposition phases of periclase (Per) or Mg 2 Al 2 O 5 (mLd) phase and corundum (Crn), and then the CF phase formed at higher pressures, showing phase assemblages of NAL + Sp, NAL + Crn + Per or mLd, and NAL + CF with increasing pressure. An additional experiment in the NaAlSiO 4 -CaAl 2 O 4 system at 20 GPa and 1400 °C showed both Na- and Ca-rich CF phases incorporated Ca 2+ and Na + , respectively. These results together with previously determined phase relations in NaAlSiO 4 -MgAl 2 O 4 can explain limited CaO contents of CF phases in crustal materials subducted into the lower mantle. In addition, pressure-temperature changes in the MgAl 2 O 4 solubility of CF-type CaAl 2 O 4 can be used as a new pressure calibrant in the multi-anvil experiments.
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产品关联
DOI
高影响因子
BMC MICROBIOLOGY
·
2025
·
IF 4.2
Wang L,Wang X,Xu L,Wang B,Ji D,Ye Y,Lu Y.
Background Tuberculosis remains a major global health threat, especially with the increasing prevalence of drug-resistant Mycobacterium tuberculosis (Mtb). There is an urgent need to develop new antibiotics with novel mechanisms of action. Zinc pyrithione (ZnPT), a bidentate metal-chelating agent, displays potent in vitro activity against bacteria and fungi. This study aimed to evaluate the antimycobacterial activity of ZnPT and to explore its potential mechanisms. Methods The bactericidal activity of ZnPT against Mtb strains was evaluated using minimum inhibitory concentration and minimum bactericidal concentration assays. The role of copper was assessed through metal chelator supplementation studies, while intracellular metal accumulation was quantified using inductively coupled plasma mass spectrometry (ICP-MS). Mechanistic analyses included transcriptomic profiling, enzyme activity assays, and targeted metabolomics to assess effects on iron-sulfur (Fe-S) cluster biogenesis and energy metabolism. Results ZnPT demonstrated potent bactericidal activity against both drug-sensitive and drug-resistant Mtb strains. Copper supplementation significantly enhanced the efficacy of ZnPT, and ICP-MS confirmed elevated intracellular copper levels. Transcriptomic analysis revealed disruption of multiple pathways, including the copper ion stress response, sulfur metabolism, Fe-S cluster biogenesis, siderophore biosynthesis, and intermediary metabolism. Notably, ZnPT induced upregulation of the sulfur mobilization (SUF) operon while repressing electron transfer ferredoxins, indicating disturbed Fe-S cluster homeostasis. Enzyme assays showed marked inhibition of cysteine desulfurase activity, a key step in Fe-S cluster assembly. Targeted metabolomics revealed depletion of tricarboxylic acid (TCA) cycle intermediates and accumulation of metabolic bottlenecks, indicating impaired Fe-S enzyme activity. ZnPT treatment further led to dysfunction of the electron transport chain, reduced proton motive force, and ATP depletion. Conclusions ZnPT exhibits antimycobacterial activity by disrupting Fe-S cluster biogenesis and impairing energy metabolism in Mtb.
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8701-8709
·
IF 2.324
Ali Mohamed A.,Liu Xiaofeng,Qiu Jianrong
Greater enhancement in upconversion (UC) luminescence was observed in the glass–ceramics (GCs) containing CaF 2 :Yb 3+ , Er 3+ nanocrystals (NCs) compared with whose doped with LaF 3 :Yb 3+ , Er 3+ NCs prepared by conventional melt-quenching technique followed by successive heat treatment. Our joint experimental and theoretical studies suggest the lager enhancement of UC emission in CaF 2 –GCs rather than of LaF 3 –GCs is associated with the difference in the microstructures, the crystal size, the local coordination environment around rare earth (RE) ions as well as the structural rigidity in the silicate region of the GCs. In addition, it was found that a more symmetric ligand field around RE ions in a smaller size crystal which distributed more homogeneously within the highest ordering silicate region favors stronger UC emission by facilitating the energy transfer process and minimizing the rate of non-radiative relaxation process. Our results may enrich our understanding about UC process in oxyfluoride GCs and provide a general picture for the photophysical processes that contribute to the UC in similar GCs systems.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 12
·2021-2028
·
IF 1.89
Jiang Daoyi,Zhang Yanyan,Zhang Fangmin,Liu Zhixiong,Han Jin,Wu Xuedong
A series of nanocomposite (NC) hydrogels containing dendritic polythioether segments were successfully prepared by free radical copolymerization. Due to the multiple thioether functional groups and the strong chelating ability of the thioether groups with metal elements, these hydrogels showed excellent absorption towards Ag nanoparticles. The size of the Ag nanoparticles (AgNPs) embedded in the hydrogel matrix can be regulated by tuning the content of dendritic segments in the polymer matrix. Small-sized AgNPs were formed with increasing of the content of polythioether dendrons. Besides, the Ag release kinetics was investigated. The hydrogels containing dendrons showed higher AgNPs loading and displayed enhanced retention of nanoparticles as compared with the pristine poly- N -isopropyl acrylamide (PNIPAM) hydrogel. Furthermore, these NC hydrogels, especially those containing dendritic segments, showed much better antimicrobial performance for Escherichia coli and anti-algae performance. These NC hydrogels have promising applications in marine antifouling coating and interfaces of biomaterials.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 8
·6036-6044
·
IF 2.22
Wang Shimin,Xiang Mingwu,Lu Yao,Guo Junming,Su Changwei,Bai Hongli,Liu Xiaofang
A series of aluminum and nickel (Al–Ni) co-doped LiAl 0.15 Ni x Mn 1.85− x O 4 composites are prepared through a facile solid-state combustion method. All the as-obtained materials show a spinel structure and analogous spherical morphology with uniform particle distribution. Moreover, the synergistic merits of Al and Ni dual substitutions endow the spinel LiMn 2 O 4 with an elevated Mn average valence state of 3.59 and relatively alleviative Jahn–Teller distortion. Among these samples, the LiAl 0.15 Ni 0.03 Mn 1.82 O 4 (LANMO-0.03) cathode exhibits an optimal electrochemical performance with the discharge capacities of 103.3 mAh g −1 and 102 mAh g −1 at 1 C and 5 C in the first cycle, and the capacity retentions are 72.0% and 68.6% after 1000 cycles, respectively. Even at 1 C and high temperature of 55 °C, an excellent capacity retention remained to be 76.6% after 200 cycles. Furthermore, the LANMO-0.03 has good Li + diffusion capability during charge/discharge, the D Li + value of the LANMO-0.03 (1.65 × 10 –11 cm 2 ∙s −1 ) is higher than that of the LiAl 0.15 Mn 1.85 O 4 (LAMO) (8.12 × 10 –12 cm 2 ∙s −1 ), and the charge transfer resistances of the LAMO and LANMO-0.03 samples are almost the same at 150 Ω before cycling but decrease to 130 Ω and 95 Ω after 1000 cycles at 1 C, respectively. These results demonstrate that the Al–Ni co-doped strategy can enhance the structural stability and provide stable Li + diffusion channel during the long cycles even at elevated temperature. Meanwhile, the facile solid-state combustion approach can also be extended to the preparation of other dual cation-doped electrode materials.
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 4
·759-765
·
IF 1.6
Zhao Dongsheng,Jing Qiang,Sun Jianwei,Zhang Jinyong
The Si 3 N 4 /SiC gradient material with a gradient composition structure was prepared by a hot pressing sintering. The sinterability, distribution of residual stress and the effect of residual stress on mechanical properties of Si 3 N 4 /SiC gradient materials were studied. The research results show that, at 1 750 °C, Si 3 N 4 /SiC gradient materials with different ratios can achieve co-sintering, and the overall relative density of the sample reaches 98.5%. Interestingly, the flexural strength of Si 3 N 4 /SiC gradient material is related to its loading surface. The flexural strength of SiC as the loading surface is about 35% higher than that of Si 3 N 4 as the loading surface. The analysis of the residual stress of the material in the gradient structure shows that the gradient stress distribution between the two phases is a vital factor affecting the mechanical properties of the material. With the increase of SiC content in the gradient direction, the fracture toughness of each layer of Si 3 N 4 /SiC gradient materials gradually decreases. The surface hardness of the pure SiC side is lower than that reported in other literature.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 10
·728
·
IF 2.5
Xue Lisha,Gao Zhan,Wang Yuan,Mao Qianhui,Yan Zhanheng
The prototype phonon-liquid electron-crystal β-Cu 2 Se has been recognized as one of the top-performing thermoelectric materials due to its ultralow lattice thermal conductivity (κ ). This paper reports the synthesis of Telluride-doped Bi 0.001 Cu 2 Se through the combination of ball milling and spark plasma sintering. The thermoelectric properties of the materials, encompassing electrical resistivity, Seebeck coefficient, and thermal conductivity within the temperature range of 300 K to 873 K, have been evaluated. The Bi 0.001 Cu 2 Se 0.90 Te 0.10 sample exhibited a peak Seebeck coefficient of 192.6 μV/K, which is approximately 23.5% higher than that of the bulk Bi 0.001 Cu 2 Se alloy. Both Bi 0.001 Cu 2 Se and Bi 0.001 Cu 2 Se 0.90 Te 0.10 demonstrated comparable high power factors of 1221.9 μWm − 1 K − 2 and 1223.6 μWm − 1 K − 2 , attributed to their moderate electronic conductivity and Seebeck coefficient. The porous Bi 0.001 Cu 2 Se 0.80 Te 0.20 samples exhibited a minimum thermal conductivity of 0.61 − 1 K − 1 at 873 K, representing a reduction of up to 21.8% compared to the bulk Bi 0.001 Cu 2 Se alloy. This decrease in thermal conductivity can be attributed to the boundaries and defects formed during the spark plasma sintering process, as well as the porous nature of the samples. The figure of merit for the Bi 0.001 Cu 2 Se 0.80 Te 0.20 was found to have a maximum value of approximately 1.49 at 873 K, primarily due to its significantly lower thermal conductivity.
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