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Achieving a large field-induced polarization and energy density in BaTiO_(3)films sputter-deposited on Si at 200℃ via a buffer-layer technique

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Journal of Advanced Ceramics 2025年第3期14卷 69-78页

作者： Chao Liu Jun Ouyang Yuyao Zhao Hanfei Zhu Hongbu Cheng Zhenyan Liang Li Wang Institute of Advanced Energy Materials and Chemistry Jinan Engineering Laboratory for Multi-scale Functional MaterialsShandong Provincial Key Laboratory of Molecular EngineeringSchool of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory of Key Film Materials&Application for Equipments(Hunan Province) Hunan Provincial Key Laboratory of Thin Film Materials and DevicesSchool of Material Sciences and EngineeringXiangtan UniversityXiangtan 411105China Key Laboratory for Liquid–Solid Structure Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China

Ferroelectric oxide films with a large field-induced polarization can be used in dielectric capacitors for charge or energy storage in microelectronic systems and hence have attracted intense research interest.A high processing temperature is usually required to produce a well-crystallized polar phase and hence a large polarization in the film,corresponding to a high charge or energy ***,high processing temperature not only reduces the charge‒discharge efficiency by producing a sizable remnant polarization but is also incompatible with the integration *** this study,we address this problem by creating a large field-induced polarization(~55.8μC/cm^(2))in BaTiO_(3)films sputter-deposited on Si at 200℃ via a buffer-layer *** large polarization led to a high energy density and efficiency(Wrec≈94.7 J/cm^(3),η≈78.2%@4 MV/cm).The thickness of LaNiO_(3)buffer layer was revealed to be the key factor determining the electric polarization(remnant and field-induced ones).A 50 nm LaNiO_(3)thickness,corresponding to the aforementioned polarization and energy storage performance,not only ensures proper crystallization in the BaTiO_(3)film,but also leads to an optimal combination of polycrystalline grains with a high dielectric *** latter accounts for the majority of the field-induced *** results revealed the key role of a buffer layer in tuning the microstructure of a low-temperature deposited ferroelectric oxide ***,the excellent charge/energy storage performance of these 200℃-deposited BaTiO_(3)films has provided many opportunities for this simple dielectric in microelectronics.

关键词： ferroelectric oxide films field-induced polarization BaTiO_(3) LaNiO3 energy density

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Sulfhydryl-modified zeolite A with exceptional strontium adsorption selectivity

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Science China Chemistry 2025年第5期68卷 1847-1858页

作者： Lingyi Li Lanxing Ren Dong Wang Junchang Chen Qi Guo Yuting Zhao Fuqiang Zhao Linwei He Jie Li Wenqi Zhang Lijuan Song Long Chen Lixi Chen Bin Wang Lin Zhu Tao Duan Zhifang Chai Shuao Wang State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences (RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow University School of Science Harbin Institute of Technology (Shenzhen) School of Chemistry and Chemical Engineering Hunan Province Key Laboratory for the Design and Application of Actinide ComplexesUniversity of South China Radioactive Waste Technology and Radiochemistry Research Department China Nuclear Power Technology Research Institute Co.Ltd. State Key Laboratory of Environment-Friendly Energy Materials School of National Defence Science & TechnologySouthwest University of Science and Technology

Efficient removal of trace radiostrontium from contaminated highly saline wastewater,such as seawater,remains a critical but challenging task due to the coexistence of large excess of hard cations like Na+,K+,Mg2+and particularly Ca2+,which shares similar physicochemical properties with Sr2+.Herein,we successfully boosted the selectivity by a sulfhydryl-functionalized NaA zeolite（SH-NaA） via ion exchange coupled with reinforced soft-soft interactions between sulfhydryl groups and Sr2+.Remarkably,SH-NaA achieved a 99.8%removal efficiency of Sr2+in the presence of a tenfold excess of Ca2+,with a distribution coefficient（Kd） of 4.98×10～5mL/*** effectiveness of SH-NaA in accurately capturing Sr2+was further validated by its superior dynamic adsorption performance in natural seawater compared to pristine NaA *** experiments highlighted SH-NaA’s exceptional Sr2+removal efficiency（qm=233.36 mg/g）,rapid adsorption kinetics（1 min）,superior decontamination depth（Kd=6.71×10～5mL/g）,and robust irradiation stability（400 kGy γ-ray）.X-ray photoelectron spectroscopy（XPS） and in situ Fouriertransform infrared（FTIR） analyses underscored the pivotal role of sulfhydryl groups in Sr2+*** functional theory（DFT） calculations revealed that the sulfhydryl-functionalized NaA zeolite exhibits the best selectivity toward Sr2+,with an interaction energy of-2.55 *** findings demonstrate that organic group functionalized zeolites hold significant promise for environmental remediation applications.

关键词： strontium selectivity adsorption seawater sulfhydryl NaA zeolite

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Metallic Co and FeNi alloy hybrid nanoparticles immobilized into N-doped graphene-like carbon nanosheets as an efficient bifunctional oxygen electrocatalyst for rechargeable Zn-air batteries

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Journal of Power Sources 2025年 645卷

作者： Tang, Qian Liu, Xiangni Yang, Duanguang Chen, Hongbiao Liu, Bei Yang, Mei Liu, Yijiang Li, Huaming College of Chemistry Xiangtan University Hunan Province Xiangtan411105 China Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education Key Laboratory of Polymeric Materials & Application Technology of Hunan Province Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province Xiangtan University Hunan Province Xiangtan411105 China

The development of efficient, low-cost and durable bifunctional oxygen electrocatalysts becomes a top priority for large-scale application of rechargeable Zn-air batteries (ZABs). Herein, we report the construction of durable and efficient bifunctional oxygen electrocatalyst by immobilizing metallic Co and FeNi alloy hybrid nanoparticles into N-doped, graphene-like carbon nanosheets (denoted as FeNi/Co-NCG) for rechargeable ZABs. Specifically, the N-enriched Schiff base-Co2+ coordination polymer (denoted as TP-Co) is first synthesized by Co2+-induced Schiff base reaction of 2,4,6-tris(4-aminophenylmethylamino)-1,3,5-triazine and picolinaldehyde, which is then mixed with the solvothermally generated melamine/Fe3+/Ni2+ complex followed by a two-step pyrolysis, yielding the FeNi/Co-NCG electrocatalyst. The resultant FeNi/Co-NCG electrocatalyst manifests not only the high bifunctional activity, i.e., a small potential gap (ΔE = 0.71 V) between Ej=10 (1.57 V, oxygen evolution reaction (OER) potential at a current density (j) of 10 mA cm−2) and E1/2 (0.86 V, oxygen reduction reaction (ORR) half-wave potential) in 0.1 M KOH solution, but also the excellent durability. Accordingly, aqueous and solid-state rechargeable ZABs assembled with the FeNi/Co-NCG air cathode display ultralong cycle life, i.e., 1393 h at 20 mA cm−2 for the aqueous rechargeable ZAB, and 120 h at 2 mA cm−2 and 70 h at 5 mA cm−2 for the solid-state rechargeable ZAB. © 2025 Elsevier B.V.

关键词： Nanosheets

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High-temperature oxidation behavior and mechanism of W-doped (TaHfTi)C solid solution ceramics

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Journal of Materials Research and technology 2025年 36卷 9869-9880页

作者： Duzhong Zhu Xiaopeng Hu Sai Liu Junyao Wu Jinwei Guo Qian Wen Shuo Han Wang Zhu Key Laboratory of Key Film Materials & Application for Equipment (Hunan Province) School of Materials Science and Engineering Xiangtan University Xiangtan 411105 Hunan China Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and Engineering Xiangtan University Xiangtan 411105 Hunan China

(TaHfTi)C solid solution ceramics doped with 0–40 mol% W are prepared using spark plasma sintering (SPS). Isothermal oxidation tests are conducted on W-doped ceramics at 800–1200 °C. The high-temperature oxidation behavior and mechanism of W-doped (TaHfTi)C solid solution ceramics at 800–1200 °C are investigated. The oxidation kinetics of the three ceramics follow the parabolic law, with the oxidation rate constant increasing in the order: W0> W20> W40, indicating a dependence of oxidation resistance on W content. During oxidation, a dense protective oxide layer forms on the W-doped ceramics, composed of multicomponent complex oxides such as Ta 8 W 9 O 47 , Hf 6 Ta 2 O 17 , and HfTiO 4 . The W40 specimen exhibits the highest oxidation resistance, which can be attributed to the formation of a dense network structure created by the outward diffusion of Ti- and Hf-containing oxides and the inward diffusion of oxygen, effectively preventing further oxidation of the substrate.

关键词： W-doped (TaHfTi)C solid solution ceramics Spark plasma sintering High-temperature oxidation behavior Oxidation mechanism

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Optimization design of welding parameters of key components of car body based on finite element 5

Optimization design of welding parameters of key components ...

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2024 5th International Conference on Advanced Materials and Intelligent Manufacturing, ICAMIM 2024

作者： Li, Lina Fa, Ping Sun, Hongchang He, Chuan Qiao, Zhiliang Department of Automobile Engineering Tianjin Transportation Technical College Tianjin China Huaiyuan County Vocational and Technical School Anhui Province Bengbu City China School of Mechanical Engineering Tianjin University of Technology and Education Tianjin China Tianjin Key Laboratory of Intelligent Robot Technology and Application Enterprises Tianjin China

The characteristics of the welding heat source, the morphology of the molten pool, the formation mechanism of the weld, and the amount of heat input have an important and direct influence on the welding quality and performance of the joint. At present, the empirical curve that depends on the experimental results or the calculation formula of statistics cannot comprehensively evaluate the impact of welding on the mechanical properties of the whole structure. Therefore, this research is based on the finite element analysis technique of Simufact Welding software and analyzes the evolution of the temperature field, stress field, and the deformation of the residual stress in the welding process, and provides a powerful tool and a lot of support for welding technology. The aim of the study is to develop an accurate numerical simulation method for the weld temperature field and a dynamic simulation analysis system for the weld stress field and deformation. 2025 Published under licence by IOP Publishing Ltd.

关键词： Residual stresses

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Enhancing the durability of concrete with construction and demolition waste aggregate through its functionalization with phase change materials (paraffin)

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Cement and Concrete Composites 2025年 162卷

作者： Jia, Zhiyou Cunha, Sandra Aguiar, José Shi, Caijun Department of Civil Engineering University of Minho Campus of Azurém Guimarães4800-058 Portugal Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha410082 China

Incorporating construction and demolition waste aggregate (DW) into concrete addresses environmental concerns by reducing the demand for virgin materials and diverting waste from landfills. However, the high porosity of DW negatively impacts the durability of concrete. In this work, DW was functionalized by impregnating it with paraffin to fill its inherent pores. Additionally, the phase change characteristics of paraffin were utilized to partially infiltrate the interfacial transition zone pores, thereby minimizing the connected porosity within the concrete. This work focuses on the durability of concrete containing DW and functionalized DW, examining factors such as chloride ion penetration, sulfate magnesium attack, freeze-thaw cycles, and carbonation resistance. The findings reveal that concrete with 100 % functionalized DW achieved a 31.5 % improvement in durability, exhibited zero carbonation depth, and demonstrated excellent resistance to freeze-thaw cycles, highlighting the effectiveness of this approach in enhancing concrete performance. © 2025 Elsevier Ltd

关键词： Concrete aggregates

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Dual rejuvenation mechanism of aged SBS modified asphalt using colza oil and dodecenyl succinic anhydride rejuvenators

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Construction and Building Materials 2025年 482卷

作者： Liang, Chenghao Li, Qishi Sun, Changjun Zhang, Henglong Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province Hunan University Hunan Changsha410082 China Hunan Provincial Engineering Research Center for construction solid wastes recycling Hunan Changsha410205 China

To respond to the concept of green and sustainable development, and to enhance the utilization of aged SBS modified asphalt (SBSMA) in road construction, a novel SBSMA rejuvenator based on colza bio-oil (CO) and dodecenyl succinic anhydride (DDSA) was developed in this study. The rejuvenation effects of CO and DDSA on SBSMA used individually and in combination were analyzed and evaluated. The findings indicate that CO exhibits a superior rejuvenation impact on the physical properties of asphalt compared to DDSA, although its effectiveness in improving high-temperature properties is limited. The physical properties of the CO/DDSA rejuvenated SBSMA are closest to those of the original SBSMA. Compared with the original SBSMA, the penetration and softening points of the CO/DDSA rejuvenated SBSMA increased by 2.08 % and 11.41 %, respectively, while its ductility decreased by 11.97 %. The incorporation of DDSA allowed the rejuvenated asphalt to recover the phase angle plateau region. Within the temperature range of 30–90 ℃, the complex shear modulus index and phase angle index of the CO/DDSA rejuvenated SBSMA are both around 1, indicating consistency between the temperature curves of its G* and δ and those of the original SBSMA. CO exhibits a strong ability to replenish light components of aged asphalt, while DDSA can chemically react with SBS segments to form ester bonds, thereby repairing the degraded SBS network. The combined application of the two rejuvenators provides a dual rejuvenation mechanism that not only disperses asphaltene aggregates formed during ageing but also reconstructs the network structure of SBSMA. © 2025 Elsevier Ltd

关键词： Bio-oil Dual rejuvenation Microscopic properties Network structure Rejuvenated SBS modified asphalt

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Long-Lived Thermally Activated Delayed Fluorescence and Room Temperature Phosphorescence for Optoelectronic Devices

SSRN

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SSRN 2025年

作者： Wang, Ping Wang, Hanyu Long, Chunye Guan, Yan Wang, Yang Wu, Chengheng Wang, Pu Wang, Fuzhi Xie, He-Lou Key Lab of Environment-friendly Chemistry and Application in Ministry of Education Key Laboratory of Polymeric Materials and Application Technology of Hunan Province Key Laboratory of Advanced Functional Polymer Materials of Colleges Universities of Hunan Province College of Chemistry Xiangtan University Hunan Province Xiangtan411105 China Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering Peking University Beijing100871 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of New Energy North China Electric Power University Beijing102206 China

Organic thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) materials have merited enormous application prospects in organic optoelectronics. In spite of this, long-lived TADF and RTP dual emissions based on single polymers still face great challenge. In this work, we develop a monomer (CzBT) with twisted electron donating carbazole and electron withdrawing benzothiadiazole (D-A) structure and then copolymerize it with N-isopropylacrylamide (NIPAM) to achieve TADF and RTP dual-emission polymers (NP1-50~NP1-1000). They not only exhibit high efficiency (20%) and long-lived (268 ms) TADF emission, but also present red RTP emission with lifetime reaching 240 ms. Theoretical calculations confirm that the introduction of twisted D-A structure and heteroatoms can not only provide appropriate ΔEST (0.21 eV) between the singlet and triplet states to promote long-lived TADF, but also enhance spin orbital coupling for RTP emission. High performance active optical waveguide with quite low optical loss coefficient of 0.097 dB/mm was obtained for NP1-50 fiber. When applied to solution-processable organic light emitting diodes (OLED) devices, it yields excellent current efficiency of 62.7 cd/A with small efficiency roll-off and maximum luminance of 90858 cd/m2. This class of polymers pave the road for high efficiency optoelectronic devices. © 2025, The Authors. All rights reserved.

关键词： Fluorescence

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Ultrasensitive Electrochemical Sensor for Luteolin Based on Mofs-Derived Metal Oxide/Alloy-Doped Nitrogen-Containing Porous Carbon Composites

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SSRN 2025年

作者： Li, Jiejun Wang, Liang Ge, Caiyu Zheng, Zuwen Wang, Yijing Zhao, Pengcheng Xie, Yixi Fei, Junjie Key Laboratory of Environmentally Friendly Chemistry and Applications Ministry of Education Xiangtan University Xiangtan411105 China Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University Xiangtan411105 China Hunan Institute of Advanced Sensing and Information Technology Xiangtan University Xiangtan411105 China

As a natural flavonoid with diverse pharmacological activities and remarkable efficacy, Luteolin has shown attractive potential for use in various applications such as drug discovery, food preservation, and functional foods. However, excessive flavonoid intake may cause adverse effects, so be alert to potential side effects. Because of this, we have successfully developed an electrochemical sensing platform for luteolin using a facile synthetic strategy. The core of this platform lies in the composite of metal oxides/alloys and nitrogen-doped porous carbon obtained after pyrolysis, whose unique porous architecture and rich pyrrolic nitrogen structure provide efficient adsorption sites for luteolin, while the diverse active centers embedded in the composite significantly enhance its electrocatalytic efficacy. The carefully constructed FeCo-NC-800/GCE electrochemical sensing platform exhibits excellent performance in detecting luteolin, even in actual samples such as peanut shells, honeysuckle, and chrysanthemum, which verified the accuracy of the sensor and demonstrated its great potential in practical applications. © 2025, The Authors. All rights reserved.

关键词： Porous carbon

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Macrocycle-based host-guest interactions improving electrical energy storage capability of all-organic dielectric composites

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Composites Science and technology 2025年 268卷

作者： Zhong, Hao Tan, Hao Deng, Liwen Luo, Hang Guo, Ru Chen, Sheng Key Laboratory of Polymeric Materials and Application Technology of Hunan Province College of Chemistry Xiangtan University Hunan Province Xiangtan411105 China State Key Laboratory of Powder Metallurgy Central South University Hunan Changsha410083 China Department of Mechanical and Automation Engineering The Chinese University of Hong Kong N.T Shatin Hong Kong

Polymer films capacitors are widely used in the electrical and electronic fields, and much effort has been devoted to exploiting the high temperature resistant polymer dielectrics with superior discharged energy density (Ud) and efficiency (η) in harsh environments. The addition of organic molecular fillers is good way to improve the energy storage properties of dielectric polymers. In this work, for the first time, the host organic filler (methyl β-cyclodextrin, M-β-CD) is embedded into the guested polynorbornene dielectrics containing amantadine side-chain (PATMD). All-organic polymeric dielectric composites (M-β-CD/PATMD) is obtained based on the host-guest interaction between PATMD matrix and M-β-CD filler. The experiment results showed that the introduction of host filler can obviously enhance the Ud and η at high temperature and high field because inclusion complex can simultaneously increase thermal performance and trap depth. The maximum Ud of 0.1 wt% M-β-CD/PATMD is 7.4 J/cm2, maintaining the η of above 90 %. Importantly, at 150 °C and 200 °C, the largest Ud of 4.3 J/cm2 and 3.6 J/cm2 is achieved respectively, and the corresponding η is 80 % and 74 %, which is both much higher than that of pure PATMD. This work proves that the cyclodextrin-based host-guest design method is a good effective strategy for the preparation of high performance polymer dielectrics. © 2025 Elsevier Ltd

关键词： Capacitor storage

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