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A self-powered Ag/β-Ga2O3 photodetector with broadband response from 200 to 980 nm based on the photovoltaic and pyro-phototronic effects

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材料科学技术（英文版） 2025年第3期206卷 125-134页

作者： Xiongxin Luo Yueming Zhang Lindong Liu Andy Berbille Kaixuan Wang Gaosi Han Laipan Zhu Zhong Lin Wang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049China School of Material Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332United States

β-Ga2O3,as one of the important 4th generation semiconductors,is widely used in solar-blind ultraviolet(UV)detectors with a short detection range of 200-280 nm benefiting from its ultra-wide bandgap,strong radiation resistance,and excellent chemical and thermal ***,a self-powered photodetector(PD)based on an Ag/β-Ga2O3 Schottky heterojunction was designed and *** a subtle design of electrodes,the pyro-phototronic effect was discovered,which can be coupled to the common photovoltaic effect and further enhance the performance of the *** to traditional Ga2O3-based PD,the as-used PD exhibited a self-driving property and a broadband response beyond the bandgap lim-itations,ranging from 200 nm(deep UV)to 980 nm(infrared).Moreover,the photoresponse time was greatly shrunk owing to the coupling *** laser irradiation,with a wavelength of 450 nm and a power density of 8 mW cm-2,the photocurrent could be improved by around 41 times compared with the sole photovoltaic ***,the performances of the Schottky PD were enhanced at both high and low *** device also possessed long-term working *** paper not only re-veals basic physics lying in the 4th generation semiconductor Ga2O3 but also sheds light on the multi-encryption transmission of light information using this PD.

关键词： Photodetector β-Ga2O3 Broadband response Pyro-phototronic effect Self-powered

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Growth of CeCo-MOF in dendritic mesoporous organosilica as highly efficient antioxidant for enhanced thermal stability of silicone rubber

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Chinese Chemical Letters 2025年第1期36卷 381-386页

作者： Guizhi Zhu Junrui Tan Longfei Tan Qiong Wu Xiangling Ren Changhui Fu Zhihui Chen Xianwei Meng State Key Laboratory of Cryogenic Science and Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering Changzhou UniversityChangzhou 213164China

High-efficient rubber antioxidants for enhanced heat resistance without compromising mechanical properties remain an enormous and long-term challenge for the rubber ***,we employed the in-situ growth of Ce-doped Co-metal-organic framework(Ce Co-MOF)in dendritic mesoporous organosilica nanoparticles(DMONs@Ce Co-MOF,denoted as DCCM)to prepare a novel antioxidant that exhibit outstanding thermal *** mesoporous organosilica nanoparticles(DMONs)effectively alleviated the incompatibility of Ce Co-MOF in the polymer matrix,and the effective scavenging of free radicals was attributed to the various oxidation states of metal ions in Ce ***,by adding only0.5 phr(parts per hundred of rubber)of DMONs@Ce Co-MOF to silicone rubber,(SR),the retention rate of tensile strength increased from 37.3%to 61.6%after aging 72 h at 250℃,and the retention rate of elongation at break of DCCM/SR1 composites reached 68%,which was 5.43 times of *** strategy of anchoring MOFs on the surface of silica also provides a viable method for preparing effective compound functionalized rubber antioxidant.

关键词： Mesoporous organosilica nanoparticles Silicone rubber Metal-organic framework Antioxidants thermal stability thermal oxidative degradation

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Revealing the thermal stability of sodium-ion battery from material to cell level using combined thermal-gas analysis

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Journal of Energy Chemistry 2025年第4期103卷 838-849页

作者： Anqi Teng Yue Zhang Lihua Jiang Yue Zhang Hongbin Dang Chenchen Wang Zheng Fang Yong Liu Xuefeng Wang Huang Li Wenxin Mei Qingsong Wang State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Anhui Provincial Emergency Management Research Institute Hefei 230000AnhuiChina Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of SciencesBeijing 100049China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590ShandongChina

The future large-scale application of sodium-ion batteries(SIBs)is inseparable from their excellent electrochemical performance and reliable safety *** present,there are few studies focusing on their safety *** analysis of thermal stability and structural changes within a single material cannot systematically describe the complex interplay of components within the battery system during the thermal runaway ***,the reaction between the battery materials themselves and their counterparts within the system can stimulate more intense exothermic behavior,thereby affecting the safety of the entire battery ***,this study delved into the thermal generation and gas evolution characteristics of the positive electrode(Na_(x)Ni_(1/3)Fe_(1/3)Mn_(1/3)O_(2),NFM111)and the negative electrode(hard carbon,HC)in SIBs,utilizing various material *** the integration of microscopic and macroscopic characterization techniques,the underlying reaction mechanisms of the positive and negative electrode materials within the battery during the heating process were *** important results are derived from this study:(Ⅰ)The instability of the solid electrolyte interphase(SEI)leads to its decomposition at temperatures below 100℃,followed by extensive decomposition within the range of 100-150℃,yielding heat and the formation of inorganic compounds,such as Na_(2)CO_(3)and Na_(2)O;(Ⅱ)The reaction between NFM111 and the electrolyte constitutes the primary exothermic event during thermal abuse,with a discernible reaction also occurring between sodium metal and the electrolyte throughout the heating process;(Ⅲ)The heat production and gas generation behaviors of multi-component reactions do not exhibit complete correlation,and the occurrence of gas production does not necessarily coincide with thermal *** results presented in this study can provide useful guidance for the safety improvement of SIBs.

关键词： Sodium-ion battery safety thermal stability Gas generation Decomposition

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Edge-Mediated Magnetic Domain Rearrangement in van der Waals Magnet Fe3GaTe2

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Nano Letters 2025年第19期25卷 7885-7891页

作者： Jin, Shuaizhao Liu, Yujia Gu, Baijun Zhang, Xiangping Wang, Yiting Chen, Yichong Xia, Tianlong Huang, Boyuan Hong, Jiawang Wang, Xueyun School of Aerospace Engineering Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices Department of Physics Renmin University of China Beijing100872 China Key Laboratory of Quantum State Construction and Manipulation Ministry of Education Renmin University of China Beijing100872 China Department of Materials Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China

The emergence of van der Waals (vdW) magnets has opened new frontiers for investigation of 2-dimensional magnetism and application of spintronic memories. However, as the system approached the nanoscale, the edge effect significantly enhanced, posing critical challenges in understanding edge-mediated modifications of magnetic behavior, such as the nanoscale magnetic domain. Here, we employ magnetic force microscopy to systematically investigate edge-mediated magnetic domain rearrangement in Fe3GaTe2 flakes. By performing thermal treatment, we observed a distinct transition from labyrinthine to edge-localized stripe domains perpendicular to the flake edges. Furthermore, we reveal a competition and stabilization between size effect and edge effect by investigating thickness-dependent variation in the length of stripe domains and indicate that such an edge effect suppresses the formation of skyrmions. These findings not only elucidate the critical role of the edge effect in governing the domain morphology of vdW magnets but also provide insights for designing edge-mediated nanostructures in next-generation spintronic devices. © 2025 American Chemical Society.

关键词： Van der Waals forces

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Cooling Process Optimization for A Superfluid Helium Ultra-Cold Neutron Source

Cooling Process Optimization for A Superfluid Helium Ultra-C...

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Chinese Materials Conference 2024, CMC 2024

作者： Qu, Qianxi Wang, Liguo Li, Laifeng Jia, Peng Xu, Dong Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing China School of Future Technology University of Chinese Academy of Sciences Beijing China

Superfluid helium (He-4), due to its unique properties such as extremely low viscosity, high thermal conductivity, and negligible neutron absorption cross section, serves as an excellent coolant or moderator. Typically, the superfluid helium Ultra-Cold Neutron Source require maintaining the temperature of large amount of ultra-high purity superfluid He-4 below 1K. This prerequisite imposes stringent specifications on heat transfer, thermal insulation, and cooling process design within cryogenic systems. In this paper, a self-liquefying cryostat equipped with three separate helium intakes is designed to supply 7L superfluid helium at a temperature of 0.7K. By analyzing the heat transfer among the three helium fluid streams and the cold source, the appropriate types and size of heat exchangers were reasonably determined. Furthermore, Al2O3 powder was employed to make the superleak, which is an important component within the system for purifying He-4. The influence of different pressing pressures on the physical properties of this superleak was also explored. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Superfluid helium

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Dewatering Stress Adjustment And Effect on Mining Pressure in Deep Sandstone Roof

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thermal science 2025年第2期29卷 1137-1143页

作者： You, Shuang Geng, Qian-Cheng Ji, Hong-Guang Zhao, Long-Long School of Civil and Resources Engineering University of Science and Technology Beijing Beijing China Beijing Key Laboratory of Urban Underground Space Engineering USTB Beijing China

To explore the coupling relationship between stress field adjustment and mining pressure in the sandstone roof at great depth under dewatering conditions, a mechanical linkage mathematical model based on elastic theory was constructed to estimate the stress adjustment in the dewatering area and its interaction with mining pressure. Additionally, the Sobol global sensitivity analysis method was introduced to evaluate the importance and interaction of various factors affecting the stress adjustment in the roof area. The study found that the main factors influencing the vertical stress at point M, in order of significance, are the horizontal distance from point M to the dewatering outlet, the pressure head of the aquifer at the dewatering outlet, the permeability coefficient of the dewatering stratum, and the influence coefficient of dewatering;among these, a significant interaction exists between the horizontal distance from point M to the dewatering outlet and the pressure head of the aquifer at the dewatering outlet, while interactions among other parameters are less significant or negligible © (2025), Vinča Institute of Nuclear sciences, Belgrade, Serbia

关键词： Sensitivity analysis

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HfC–HfO_(2) modified high/superhigh temperature thermal protection coating for superior hot corrosion resistance and antioxidation performance

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Journal of Advanced Ceramics 2025年第1期14卷 177-191页

作者： Zhiyun Ye Shuqi Wang Shuang Yu Xinrui Zhao Yongchun Zou Guoliang Chen Lei Wen Lina Zhao Guangxi Zhang Yaming Wang Jiahu Ouyang Dechang Jia Yu Zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China Xi’an Aerospace Composites Research Institute Academy of Aerospace Propulsion TechnologyXi’an 710025China

With advances in the thrust-weight ratio,the service temperature of gas turbine engines even exceeds 1500℃,which is urgent for the development of high/superhigh-temperature thermal protection systems(TPSs)for long-term *** alloys are increasingly viewed as promising structural materials for high-temperature applications because of their superior high-temperature mechanical strength,but the“pest”catastrophic oxidation greatly restricts their further *** this study,a HfC–HfO_(2)-modified silicide coating was prepared via an innovative method of halide-activated pack cementation(HAPC)combined with liquid-plasma-assisted particle deposition and sintering of niobium alloys,resulting in a composite coating with excellent hot corrosion resistance and high-temperature oxidation *** modified multilayer coating is characterized by the synergistic combination of a dense NbSi_(2) inner layer and a HfC–HfO_(2) porous outer layer,resulting in a significant improvement in high-temperature performance compared with that of the single NbSi_(2) *** corrosion gain of the composite coating is only 13.94 mg·cm^(−2) after a corrosion time of 200 h at 900℃,and an intact oxide scale surface is observed after oxidation at 1500℃for 500 *** improvement is attributed to the formation of a robust Hf-rich skeleton provided by the deposited HfC–HfO_(2) layer,which can accelerate the formation of a highly stable corroded layer/oxide *** addition,multiple stress release mechanisms of the composite coating at high temperatures also provide substantial contributions to long-term *** these merits make HfC–HfO_(2)-modified composite coatings on niobium alloys competitive for the development of high/superhigh-temperature thermal protection systems for long-term service.

关键词： thermal protection coating niobium alloys hot corrosion resistance high-temperature oxidation resistance stress release mechanism

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The thermal stability of Er2O3 anti-reflective films deposited on CVD diamond by magnetron sputtering

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Ceramics International 2025年第13期51卷 17568-17574页

作者： Huang, Yabo Zhao, Xia Zhu, Xiaohua Liu, Shengji Wang, Xulei Yue, Yuehan Sun, Weishuai Wang, Pei Guo, Xiaoqin Li, Chengming Henan Key Laboratory of Aeronautical Materials and Application Technologies Zhengzhou University of Aeronautics School of Materials Science and Engineering Henan Zhengzhou450046 China Beijing Institute of Metrology Beijing100029 China SF Diamond Co. LTD Zhengzhou450016 China Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites Institute of Carbon Matrix Composites Henan Academy of Sciences Zhengzhou450046 China Institute for Advanced Materials and Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China

Erbium oxide (Er2O3) films with excellent thermal and optical performance are essential for application as heat-resistant and anti-reflective (AR) materials in chemical vapor deposition (CVD) diamond infrared windows. In this study, the thermal stability of Er2O3 AR films was investigated by heat treatment. The phase composition, microstructure, thermogravimetric analysis, mechanical properties, and infrared (IR) transmission performances of the Er2O3 AR films were thoroughly investigated. The results show that the cubic (222) plane orientation of the Er2O3 AR films after heat treatment was preferential to that at room temperature. No significant change was observed in the DSC and TG curve at the temperature varied, but the DSC curve of the Er2O3 AR films revealed two distinct stages at 502 °C and 798 °C owing to the formation of Er2O3 (420) and (134) planes. Specifically, the phase structure remained unchanged by high-resolution transmission electron microscope (HRTEM) observation, and the peak at 578.4 cm−1 was the only obvious impurity peak in the Raman spectrum owing to the introduction of the Er–O bond. Additionally, significant shedding of the Er2O3 AR films on the surface of the CVD diamond occurred at high temperatures. The grain size and roughness increased as the temperature increased, adversely affecting the continuous abrasion resistance of the Er2O3 AR films. Moreover, the Er2O3 AR films exhibited outstanding mechanical and optical properties at 800 °C, achieving a depth of only 0.65 μm and a maximum transmittance increased from 65 % of diamond to 76 %. This study provides valuable insights into the thermal stability of the Er2O3 AR films under high temperature application scenarios. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Oxide films

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Modeling and Experimental Study of an Open Two-Phase Loop Driven by Osmotic Pressure and Capillary Force

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Frontiers in Heat and Mass Transfer 2025年第1期23卷 55-70页

作者： Hanli Bi Zheng Peng Chenpeng Liu Zhichao Jia Guoguang Li Yuandong Guo Hongxing Zhang Jianyin Miao National Key Laboratory of SpacecraftThermal Control Beijing Institute of Spacecraft System EngineeringChina Academy of Space TechnologyBeijing100094China School of Aeronautical Science and Engineering Beihang UniversityBeijing100083China School of Energy and Environment Engineering University of Science and Technology BeijingBeijing100083China

As space technology advances,thermal control systems must effectively collect and dissipate heat from distributed,multi-source *** heat pipe is a highly reliable two-phase heat transfer component,but it has several limitations when addressing multi-source heat *** by the transport and heat dissipation system of plants,large trees achieve stable and efficient liquid supply under the influence of two driving forces:capillary force during transpiration in the leaves(pull)and root pressure generated by osmotic pressure in the roots(push).The root pressure provides an effective liquid supply with a driving force exceeding 2 MPa,far greater than the driving force in conventional capillary-pumped two-phase *** has shown that osmotic heat pipes offer a powerful driving force,and combining osmotic pressure with capillary force has significant ***,this paper designs a multi-evaporator,dual-drive two-phase loop,using both osmotic pressure and capillary force to solve the multi-source heat dissipation ***,a transmembrane water flux model for the osmotic pressure-driven device was established to predict the maximum heat transfer capacity of the dual-drive two-phase ***,an experimental setup for a multi-evaporator“osmotic pressure+capillary force”dual-drive two-phase loop was constructed,capable of transferring at least 235 W of power under a reverse gravity condition of 20 *** study also analyzed the effects of reverse gravity height,heat load distribution among the three evaporators,startup sequence,and varying branch resistances on the performance of the dual-drive two-phase loop.

关键词： Multi-heat sources osmotic pressure two-phase loop dual-drive loop heat pipe

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Numerical Simulation of Radiation Transport to Improve Microalgae Cultivation in an Air-Lift Photobioreactor

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Journal of thermal science 2025年第1期34卷 62-76页

作者： ZHANG Xianbin LI Mingjia HUNG Tzuchen ZHANG Zixun Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Department of Mechanical Engineering Taipei University of TechnologyTaipei 106344China

A comprehensive numerical model is developed to simulate the growth of microalgae under light/dark cycling *** purpose of this study is to predict the growth rate of Chlorella vulgaris cultivated in photobioreactors(PBRs)in order to improve the light conditions for microalgae and enhance the photosynthetic *** fluid dynamics(CFD)is used to simulate its internal hydrodynamic *** Lagrangian method is employed to track the movement of microalgae *** radiative transfer equation(RTE)is used to obtain light intensity *** combination of light radiation field and microalgae cell motions is used to construct the light history and they are integrated into the model of the photosynthetic units(PSU)to calculate the microalgae growth *** numerical results demonstrate that enhanced light/dark cycling frequency with ordered mixing can promote efficient microalgae *** effect of the vortex flow field generated by the baffles in an air-lift PBR is analyzed for increasing microalgae growth *** using the 1:1 baffle spacing,the biomass production of microalgae is increased by 41.8% compared to the original PBR.

关键词： photobioreactor light distribution particle tracking structure optimization

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