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Realizing high thermoelectric performance via selective resonant doping in oxyselenide BiCuSeO

Nano Research 2023年第1期16卷 1679-1687页

作者： Yue-Xing Chen Wenning Qin Adil Mansoor Adeel Abbas Fu Li Guang-xing Liang Ping Fan Muhammad Usman Muzaffar Bushra Jabar Zhen-hua Ge Zhuang-hao Zheng F1 Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China International Center for Quantum Design of Functional Materials(ICQD) Hefei National Laboratory for Physical Sciences at Microscale(HFNL)and CAS Center for Excellence in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Tuning the charge carrier concentration is imperative to optimize the thermoelectric(TE)performance of a *** BiCuSeO based oxyselenides,doping efforts have been limited to optimizing the carrier *** the present work,dual-doping of In and Pb at Bi site is introduced for p-type BiCuSeO to realize the electric transport channels with intricate band characteristics to improve the power factor(PF).Herein,the impurity resonant state is realized via doping of resonant dopant In over Pb,where Pb comes forward to optimize the Fermi energy in the dual-doped BiCuSeO system to divulge the significance of complex electronic *** manifold roles of dual-doping are used to adjust the elevation of the PF due to the significant enhancement in electrical ***,the combined experimental and theoretical study shows that the In/Pb dual doping at Bi sites gently reduces bandgap,introduces resonant doping states with shifting down the Fermi level into valence band(VB)with a larger density of state,and thus causes to increase the carrier concentration and effective mass(m*),which are favorable to enhance the electronic transport *** a result,both improved ZTmax=0.87(at 873 K)and high ZTave=0.5(at 300–873 K)are realized for InyBi(1−x)−yPbxCuSeO(where x=0.06 and y=0.04)*** obtained results successfully demonstrate the effectiveness of the selective dual doping with resonant dopant inducing band manipulation and carrier engineering that can unlock new prospects to develop high TE materials.

关键词： thermoelectric material BiCuSeO dual-doping power factor figure of merit

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Decade Milestone Advancement of Defect-Engineered g-C_(3)N_(4) for Solar Catalytic Applications

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Nano-Micro Letters 2024年第4期16卷 153-218页

作者： Shaoqi Hou Xiaochun Gao Xingyue Lv Yilin Zhao Xitao Yin Ying Liu Juan Fang Xingxing Yu Xiaoguang Ma Tianyi Ma Dawei Su School of Mathematical and Physical Sciences Faculty of ScienceUniversity of Technology Sydney(UTS)SydneyNSW 2007Australia Laboratory of Plasma and Energy Conversion School of Physics and Optoelectronic EngineeringLudong University186 Middle Hongqi RoadYantai 264025People’s Republic of China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China Department of Chemistry The University of Tokyo7‑3‑1 HogoBunkyoTokyoJapan School of Science STEM CollegeRMIT UniversityMelbourneVIC 3000Australia

Over the past decade, graphitic carbon nitride(g-C_(3)N_(4)) has emerged as a universal photocatalyst toward various sustainable carbo-neutral technologies. Despite solar applications discrepancy, g-C_(3)N_(4) is still confronted with a general fatal issue of insufficient supply of thermodynamically active photocarriers due to its inferior solar harvesting ability and sluggish charge transfer dynamics. Fortunately, this could be significantly alleviated by the “all-in-one” defect engineering strategy, which enables a simultaneous amelioration of both textural uniqueness and intrinsic electronic band structures. To this end, we have summarized an unprecedently comprehensive discussion on defect controls including the vacancy/non-metallic dopant creation with optimized electronic band structure and electronic density, metallic doping with ultraactive coordinated environment(M–N_(x), M–C_(2)N_(2), M–O bonding), functional group grafting with optimized band structure, and promoted crystallinity with extended conjugation π system with weakened interlayered van der Waals interaction. Among them, the defect states induced by various defect types such as N vacancy, P/S/halogen dopants, and cyano group in boosting solar harvesting and accelerating photocarrier transfer have also been emphasized. More importantly, the shallow defect traps identified by femtosecond transient absorption spectra(fs-TAS) have also been highlighted. It is believed that this review would pave the way for future readers with a unique insight into a more precise defective g-C_(3)N_(4) “customization”, motivating more profound thinking and flourishing research outputs on g-C_(3)N_(4)-based photocatalysis.

关键词： Defect engineering g-C_(3)N_(4) Electronic band structures Photocarrier transfer kinetics Defect states

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Zeolite-encaged mononuclear copper centers catalyze CO2 selective hydrogenation to methanol

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National science Review 2023年第7期10卷 134-141页

作者： Yuchao Chai Bin Qin Bonan Li Weili Dai Guangjun Wu Naijia Guan Landong Li Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education College of Chemistry Nankai University CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences School of Materials Science and Engineering Nankai University

The selective hydrogenation of CO2to methanol by renewable hydrogen source represents an attractive route for CO2recycling and is carbon *** catalysts with high activity and methanol selectivity are being vigorously pursued,and current debates on the active site and reaction pathway need to be ***,we report a design of faujasite-encaged mononuclear Cu centers,namely Cu@FAU,for this challenging *** methanol space-time-yield（STY） of 12.8 mmol gcat-1h-1and methanol selectivity of 89.5% are simultaneously achieved at a relatively low reaction temperature of 513 K,making Cu@FAU a potential methanol synthesis catalyst from *** zeolite-encaged mononuclear Cu centers as the destined active sites,the unique reaction pathway of stepwise CO2hydrogenation over Cu@FAU is *** work provides a clear example of catalytic reaction with explicit structure-activity relationship and highlights the power of zeolite catalysis in complex chemical transformations.

关键词： CO2 hydrogenation zeolite methanol catalysis mononuclear copper

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Oneε-Ga_(2)O_(3)-based solar-blind Schottky photodetector emphasizing high photocurrent gain and photocurrent-intensity linearity

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Chinese physics B 2023年第5期32卷 158-163页

作者：安跃华高震森郭雨张少辉刘增唐为华 School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China Innovation Center for Gallium Oxide Semiconductor(IC-GAO) College of Integrated Circuit Science and EngineeringNanjing University of Posts and TelecommunicationsNanjing 210023China Institute of Microscale Optoelectronics College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Theε-Ga_(2)O_(3) thin film was grown on sapphire substrate by using metalorganic chemical vapor deposition(MOCVD)method,and then was used to fabricate a deep-ultraviolet(DUV)photodetector(PD).Theε-Ga_(2)O_(3) thin film shown good crystal quality and decent surface *** by a 254-nm DUV light,the photodetector displayed good optoelectronic performance and high wavelength selectivity,such as photoresponsivity(R)of 175.69 A/W,detectivity(D*)of 2.46×10^(15) Jones,external quantum efficiency(EQE)of 8.6×10^(4)%and good photocurrent-intensity linearity,suggesting decent DUV photosensing *** 5 V and under illumination with light intensity of 800μW/cm2,the photocurrent gain is as high as 859 owing to the recycling gain mechanism and delayed carrier recombination;and the photocurrent gain decreases as the incident light intensity increases because of the recombination of photogenerated carriers by the large photon flux.

关键词： metastable Ga_(2)O_(3) photocurrent gain linearity DUV detection

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Monolayer Bismuth Ferrite: Topological Antiferromagnetic Metal with Bimeron Spin Textures

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Chinese physics Letters 2025年第5期42卷 151-160页

作者： Yun Lu Dong Zhang Kai Chang State Key Laboratory of Semiconductor Physics and Chip Technologies Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Center for Quantum Matter School of PhysicsZhejiang UniversityHangzhou 310058China Institute for Advanced Study in Physics Zhejiang UniversityHangzhou 310058China

The competition between dimensionality and ordering in multiferroic materials is of great interest for both fundamental physics and potential applications. Combining first-principles calculations with micromagnetic simulations, we investigate recently synthesized ultrathin perovskite bismuth ferrite(BFO) films. Our numerical results reveal that, at the monolayer limit, the ferroelectricity of BFO is missing because the octahedral distortions are constrained. However, the monolayer bismuth ferrite is a topological antiferromagnetic metal with tunable bimeron magnetic structure. The dual topologically non-trivial characteristics make monolayer bismuth ferrite a multifunctional building block in future spintronic devices.

关键词： octahedral distortions monolayer bismuth ferrite bimeron spin textures micromagnetic simulations bismuth ferrite bfo multiferroic materials topological antiferromagnetic metal

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Numerical study of fast ion loss and redistribution in the presence of energetic particle mode

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The European Physical Journal Special Topics 2025年 1-11页

作者： Wang, Yan Duan, Sizhe Cai, Huishan School of Nuclear Science and Technology University of Science and Technology of China Hefei China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen China

In this work, we have performed a general numerical investigation of the fast ion loss and redistribution in the presence of energetic particle mode (EPM) with different level of poloidal sideband, using the kinetic-MHD code M3D-K. It is found that the $$n=1$$ EPM, with the $$m=2$$ dominant poloidal harmonic and $$m=3$$ poloidal sideband, is excited by co-passing fast ions. The amplitude of $$m=3$$ sideband depends on the plasma density profile, which is linked to the continuum damping. By changing plasma density around the $$q=3$$ rational surface, the saturation amplitude of $$m=3$$ sideband decreases, while the saturation amplitude of $$m=2$$ harmonic remains almost unchanged. The loss and redistribution of fast ions are calculated with different plasma density profile, corresponding to different amplitude of $$m=3$$ sideband (called “strong sideband case” and “weak sideband case”). Compared to the weak sideband case, the resonant fast ions have a larger radial excursion in the strong sideband case, and thus, the loss and redistribution level is higher. These results indicate that, when the continuum damping linked to the equilibrium profiles is relatively small, a novel EPM with a considerable poloidal sideband could be excited and thus induces a more significant loss and redistribution of fast ions.

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Floquet Chern vector topological insulators in three dimensions

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Physical Review B 2025年第13期111卷 134301-134301页

作者： Fangyuan Ma Junrong Feng Feng Li Ying Wu Di Zhou Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China School of Physics Nanjing University of Science and Technology Nanjing 210094 China

We theoretically and numerically investigate Chern vector insulators and topological surface states in a three-dimensional lattice, based on phase-delayed temporally periodic interactions within the tight-binding model. These Floquet interactions break time-reversal symmetry, effectively inducing a gauge field analogous to magnetic flux. This gauge field results in Chern numbers in all spatial dimensions, collectively forming the Chern vector. This vector characterizes the topological phases and signifies the emergence of robust surface states. Numerically, we observe these states propagating unidirectionally without backscattering on all open surfaces of the three-dimensional system. Our paper paves the way for breaking time-reversal symmetry and realizing three-dimensional Chern vector topological insulators using temporally periodic Floquet techniques.

关键词： Topological insulators

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Autocatalytic reduction-assisted synthesis of segmented porous PtTe nanochains for enhancing methanol oxidation reaction

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Nano Research Energy 2023年第1期2卷 140-147页

作者： Qiqi Zhang Tianyu Xia He Huang Jialong Liu Mengyuan Zhu Hao Yu Weifeng Xu Yuping Huo Congli He Shipeng Shen Cong Lu Rongming Wang Shouguo Wang Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China Key Laboratory of Materials Physics of the Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Physics and Electronics School of Mathematics and PhysicsBeijing University of Chemical TechnologyBeijing 100029China Synchrotron Radiation Research Center Hyogo Science and Technology AssociationTatsuno 6795165Japan Institute for Multidisciplinary Innovation University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Anhui UniversityHefei 230601China

Morphology engineering has been developed as one of the most widely used strategies for improving the performance of ***,the harsh reaction conditions and cumbersome reaction steps during the nanomaterials synthesis still limit their industrial ***,one-dimensional(1D)novel-segmented PtTe porous nanochains(PNCs)were successfully synthesized by the template methods assisted by Pt autocatalytic *** PtTe PNCs consist of consecutive mesoporous architectures that provide a large electrochemical surface area(ECSA)and abundant active sites to enhance methanol oxidation reaction(MOR).Furthermore,1D nanostructure as a robust sustaining frame can maintain a high mass/charge transfer rate in a long-term durability *** 2,000 cyclic voltammetry(CV)cycles,the ECSA value of PtTe PNCs remained as high as 44.47 m^(2)·gPt^(-1),which was much larger than that of commercial Pt/C(3.95 m^(2)·gPt^(-1)).The high catalytic activity and durability of PtTe PNCs are also supported by CO stripping test and density functional theory *** autocatalytic reduction-assisted synthesis provides new insights for designing efficient low-dimensional nanocatalysts.

关键词： autocatalytic process PtTe catalysts methanol oxidation reactions porous nanochain

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Radiation effects of electrons on multilayer FePS3studied with laser plasma accelerator

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Chinese physics B 2022年第8期31卷 505-511页

作者： Meng Peng Jun-Bo Yang Hao Chen Bo-Yuan Li Xu-Lei Ge Xiao-Hu Yang Guo-Bo Zhang Yan-Yun Ma Department of Physics National University of Defense TechnologyChangsha 410072China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518000China Key Laboratory for Laser Plasmas(MoE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

Space radiation with inherently broadband spectral flux poses a huge danger to astronauts and electronics on aircraft,but it is hard to simulate such feature with conventional radiation sources. Using a tabletop laser-plasma accelerator, we can reproduce exponential energy particle beams as similar as possible to these in space radiation. We used such an electron beam to study the electron radiation effects on the surface structure and performance of two-dimensional material(Fe PS3).Energetic electron beam led to bulk sample cleavage and damage between areas of uneven thickness. For the Fe PS3sheet sample, electron radiation transformed it from crystalline state to amorphous state, causing the sample surface to *** full widths at the half maximum of characteristic Raman peaks became larger, and the intensities of characteristic Raman peaks became weak or even disappeared dramatically under electron radiation. This trend became more obvious for thinner samples, and this phenomenon was attributed to the cleavage of P–P and P–S bonds, destabilizing the bipyramid structure of [P2S6]4-unit. The results are of great significance for testing the maximum allowable radiation dose for the two-dimensional material, implying that Fe PS3cannot withstand such energetic electron radiation without an essential shield.

关键词： space radiation laser–plasma interaction two-dimensional material Raman spectroscopy

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Bifunctional optical probe based on La_(3)Mg_(2)SbO_(9):Mn^(4+)phosphors for temperature and pressure sensing

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Journal of Materials science & technology 2024年第27期194卷 98-109页

作者： Zhanglin Chen Songmo Du Fei Li Shijia Zhang Shuo Zhao Zhaobo Tian Jie Zhang Xuanyi Yuan Guanghua Liu Kexin Chen State Key Laboratory of New Ceramics&Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China Advanced Ceramics and Structures Center Yongjiang LaboratoryNingbo 315021China Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China

Photoluminescent materials,serving as optical probes,constitute a significant medium for reliable re-mote sensing of fundamental state parameters such as temperature and ***,we report a novel Mn^(4+)-activated perovskite-type La_(3) Mg2 SbO9 phosphor(LMS:Mn^(4+))for bifunctional application in both thermometry and *** excitation with 341 nm,LMS:Mn^(4+)(0.7%Mn^(4+))emits a bright narrow-band red light peaking at 705 nm with an FWHM(full width at half maximum)of 32 *** a thermometer,when the temperature surpasses 298 K,non-radiative transitions from the ^(2)Eg excited state lead to a sharp decrease in decay lifetimes with increasing *** allows for lifetime-based luminescence thermometry with a relative sensitivity of 2.52%K^(−1) at 391 ***,LMS:Mn^(4+)was processed into a temperature-sensing coating and its non-contact thermometry functionality was *** manometry applications,the LMS:Mn^(4+)probe experiences substantial pressure-dependent redshift with a sensitivity of 1.20 nm GPa^(−1) in the testing range of 9.48 GPa,which is about 3.3 times that of conventional ruby ***,its FWHM consistently remains below 37 nm,which con-tributes to a high reliability of pressure *** above results indicate that the LMS:Mn^(4+)constitutes a promising bifunctional luminescence probe material in thermometry and manometry.

关键词： Perovskite Phosphors Thermometry Manometry

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