检索结果-南通市图书馆

Regulating Effect of Substrate Temperature on Sputteringgrown Ge/Si QDs under Low Ge Deposition

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(materials Science) 2024年第4期39卷 888-894页

作者：舒启江 YANG Linjing LIU Hongxing 黄鹏儒 Institute of information Yunnan University of Chinese MedicineKunming 650500China guangxi key laboratory of information materials and guangxi collaborative innovation Center of structure and property for new energy and materials School of Material Science&EngineeringGuilin University of Electronic TechnologyGuilin 541004China

The effect of deposition temperature on the morphology and optoelectronic performance of Ge/Si QDs grown by magnetron sputtering under low Ge deposition(~4 nm)was investigated by atomic force microscopy,Raman spectroscopy,and photoluminescence(PL)*** experimental results indicate that temperatures higher than 750℃effectively increase the crystallization rate and surface smoothness of the Si buffer layer,and temperatures higher than 600℃significantly enhance the migration ability of Ge atoms,thus increasing the probability of Ge atoms meeting and nucleating to form QDs on Si buffer layer,but an excessively high temperature will cause the QDs to undergo an Ostwald ripening process and thus develop into super large *** addition,some PL peaks were observed in samples containing small-sized,high-density Ge QDs,the photoelectric properties reflected by these peaks were in good agreement with the corresponding structural characteristics of the grown *** results demonstrate the viability of preparing high-quality QDs by magnetron sputtering at high deposition rate,and the temperature effect is expected to work in conjunction with other controllable factors to further regulate QD growth,which paves an effective way for the industrial production of QDs that can be used in future devices.

关键词： Ge/Si QDs deposition temperatures evolution law photoelectric performance

Exploring the Cation Regulation Mechanism for Interfacial Water Involved in the Hydrogen Evolution Reaction by In Situ Raman Spectroscopy

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第3期16卷 303-312页

作者： Xueqiu You Dongao Zhang Xia‑Guang Zhang Xiangyu Li Jing‑Hua Tian Yao‑Hui Wang Jian‑Feng Li School of Ocean information Engineering Fujian Provincial Key Laboratory of Oceanic Information Perception and Intelligent ProcessingJimei UniversityXiamen 361021People’s Republic of China State key laboratory of Physical Chemistry of Solid Surfaces MOE Key Laboratory of Spectrochemical Analysis and InstrumentationiChEMCollege of Chemistry and Chemical EngineeringCollege of MaterialsCollege of EnergyXiamen UniversityXiamen 361005People’s Republic of China key laboratory of Green Chemical Media and Reactions Ministry of EducationCollaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsCollege of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007People’s Republic of China innovation laboratory for Sciences and Technologies of energy materials of Fujian Province(IKKEM) Xiamen 361005People’s Republic of China

Interfacial water molecules are the most important participants in the hydrogen evolution reaction(HER).Hence,understanding the behavior and role that interfacial water plays will ultimately reveal the HER ***,investigating interfacial water is extremely challenging owing to the interference caused by bulk water molecules and complexity of the interfacial ***,the behaviors of interfacial water in different cationic electrolytes on Pd surfaces were investigated by the electrochemistry,in situ core-shell nanostructure enhanced Raman spectroscopy and theoretical simulation *** spectral evidence reveals a red shift in the frequency and a decrease in the intensity of interfacial water as the potential is shifted in the positively *** comparing the different cation electrolyte systems at a given potential,the frequency of the interfacial water peak increases in the specified order:Li+structure of interfacial water was optimized by adjusting the radius,valence,and concentration of cation to form the two-H down *** unique interfacial water structure will improve the charge transfer efficiency between the water and electrode further enhancing the HER ***,local cation tuning strategies can be used to improve the HER performance by optimizing the interfacial water structure.

关键词： In situ Raman Interfacial water Hydrogen evolution reaction Cations

Imaging momentum-space Cooper pair formation and its competition with the charge density wave gap in a kagome superconductor

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 142-150页

作者： Yiming Sun Yubing Tu Yang Luo Shuikang Yu Hongyu Li Yunmei Zhang Ping Wu Zhuying Wang Fan Zhang Wanru Ma Zuowei Liang Jianjun Ying Tao Wu Ziji Xiang Junfeng He Lei Shan Zhenyu Wang Xianhui Chen Department of Physics CAS Key Laboratory of Strongly Coupled Quantum Matter Physicsand Hefei National LaboratoryUniversity of Science and Technology of ChinaHefei 230026China information materials and Intelligent Sensing laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China collaborative innovation Center of Advanced Microstructures Nanjing 210093China

The superconducting ground state of kagome metals AV_(3)Sb_(5)(where A stands for K,Rb,or Cs)emerges from an exotic charge density wave(CDW)state that potentially breaks both rotational and time reversal ***,the specifics of the Cooper pairing mechanism,and the nature of the interplay between these two states remain elusive,largely due to the lack of momentum-space(k-space)superconducting energy gap *** implementing Bogoliubov quasiparticle interference(B QPI)imaging,we obtain k-space information on the multiband superconducting gap structureΔ_(SC)^(i)(k)in pristine CsV_(3)Sb_(5).We show that the estimated energy gap on the vanadium d_(xy/x^(2)-y^(2))orbital is anisotropic but nodeless,with a minimal value located near the M ***,a comparison ofΔ_(SC)^(i)(k)with the CDW gapΔ_(CDW)^(i)(k)obtained by angle-re solved photoemission spectro scopy(ARPES)reveals direct k-space competition between the se two order parameters,i.e.,the opening of a large(small)CDW gap at a given momentum corresponds to a small(large)superconducting *** the long-range CDW order is suppressed by replacing vanadium with titanium,we find a nearly isotropic energy gap on both the V and Sb *** information will be critical for identifying the microscopic pairing mechanism and its interplay with intertwined electro nic orders in this kagome superconductor family.

关键词： kagome lattice charge density wave superconducting energy gap scanning tunneling microscopy

Crystalline-amorphization-recrystallization structural transition and emergent superconductivity in van der Waals semiconductor SiP under compression

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 115-122页

作者： Chunhua Chen Zhenyu Ding Yonghui Zhou Yifang Yuan Nixian Qian Jing Wang Shuyang Wang Ying Zhou Chao An Min Zhang Xuliang Chen Xiaoping Yang Mingliang Tian Zhaorong Yang Anhui key laboratory of Low-energy Quantum materials and Devices High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China key laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityHefei 230601China Institutes of Physical Science and information Technology Anhui UniversityZhengzhou 450001China collaborative innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

van der Waals(vdW)semiconductors have gained significant attention due to their unique physical properties and promising applications,which are embedded within distinct crystallographic ***,we report a pressure-induced crystallineamorphization-recrystallization transition under compression in binary vdW semiconductor *** compression to 52 GPa,bulk SiP undergoes a consecutive phase transition from pristine crystalline to amorphous phase,ultimately to recrystallized *** employing synchrotron X-ray diffraction experiments in conjunction with high-pressure crystal structure searching techniques,we reveal that the recrystallized Si P hosts a tetragonal structure(space group I4mm)and further transforms partially into a cubic phase(space group Fm3m).Consistently,electrical transport and alternating-current magnetic susceptibility measurements indicate the presence of three superconducting phases,which are embedded in separate crystallographic symmetries—the amorphous,tetragonal,and cubic ***,a high superconducting transition temperature of 12.3 K is observed in its recovered tetragonal phase during *** findings uncover a novel phase evolution path and elucidate a pressure-engineered structure-property relationship in vdW semiconductor *** results not only offer a new platform to explore the transformation between different structures and functionalities,but also provide new opportunities for the design and exploration of advanced devices based on vdW materials.

关键词： recrystallization transition amorphous

Construction of ZnO@CDs@Co_(3)O_(4) sandwich heterostructure with multi-interfacial electron-transfer toward enhanced photocatalytic CO_(2) reduction

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 147-152页

作者： Xiuzheng Deng Yi Ke Jiawen Ding Yingtang Zhou Hui Huang Qian Liang Zhenhui Kang Advanced Catalysis and Green Manufacturing collaborative innovation Center CNPC-CZU Innovation AllianceSchool of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Institute of Functional Nano&Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Zhejiang key laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316004China

Photocatalytic conversion of CO_(2) into small-molecule chemical feedstocks can meet the growing demand for energy and alleviate the global warming. Herein, a p-n ZnO@CDs@Co_(3)O_(4) heterojunction with sandwich structure was constructed by calcination method of self-assembled ZIF-8@CDs@ZIF-67. The ZnO@CDs@Co_(3)O_(4) with well-defined interfacial structure exhibited the significantly enhanced photocatalytic CO_(2) reduction activity, and the optimal catalyst indicated the(CO + CH_(4)) evolution rate of 214.53μmol g^(-1)h^(-1) under simulated solar light, which was superior to ZnO, Co_(3)O_(4) and binary ZnO@Co_(3)O_(4).The internal cavity, exposed active sites, multiple interfaces and constructed p-n heterojunction can facilitate the light harvesting and photoexcited electron transfer. Besides, after introduction of CDs placed in the middle layer between ZnO and Co_(3)O_(4), CDs with excellent photoelectric property further promoted charge separation and migration. This work represents an appealing strategy to construct well-defined photocatalysts for boosting CO_(2) photoreduction.

关键词： Metal-organic framework Photocatalytic CO_(2) reduction Carbon dots p-n heterojunction Sandwich heterostructure

The unique spontaneous polarization property and application of ferroelectric materials in photocatalysis

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第5期17卷 3571-3585页

作者： Jinghua An Chang Xu Lu Li Bo Tang College of Chemistry Chemical Engineering and Materials ScienceKey Laboratory of Molecular and Nano ProbesMinistry of EducationCollaborative Innovation Center of Functionalized Probes for Chemical Imaging in University of ShandongInstitute of Molecular and Nano ScienceShandong Normal UniversityJinan 250014China Laoshan laboratory 168 Wenhai Middle RdAoshanwei JimoQingdao 266237China

The unique spontaneous polarization property of ferroelectric material makes it to be a special catalyst in *** spontaneous polarization property can induce the formation of built-in electric field,which can improve the separation of photoelectrons and holes to affect photocatalytic *** internal electric field induced by spontaneous polarization can be influenced by multiple factors such as the morphology,the concentration of defect,the type of doped heteroatoms,as well as the composition of ***,the preparation method,pretreating temperature,the strength of prepolarized external electric field of ferroelectric-based photocatalysts as well as the strength of external mechanical force or external magnetic field in photocatalytic reactions can influence the photocatalytic effectivity via influencing spontaneous polarization-induced internal electric ***,it is urgently to unveil the mystery of structure-activity relationships for ferroelectric materials-based photocatalysts,which is usually *** this in mind,this review was provided for the role of various complex influencing factors on ferroelectric materials-based photocatalysis based on the latest advancement in the fields of new energy development,environmental *** the beginning,the basic structure and properties of ferroelectric material are ***,popular synthesis methods of ferroelectric-based photocatalysts are *** that,two main mechanisms of ferroelectric photocatalysis are *** research progress of ferroelectric photocatalysis is then given emphatically according to the classification of photocatalytic ***,the problems existing nowadays and the challenges facing in the future on the application of ferroelectric materials-based photocatalysts are outlined in the summary and outlook section.

关键词： spontaneous polarization photocatalysis ferroelectric separation of electrons and holes

Superior performance for lithium storage from an integrated composite anode consisting of SiO-based active material and current collector

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of materials Science 2020年第3期14卷 243-254页

作者： Junqiang Hua Hailiang Chu Ying Zhu Tingting Fang Shujun Qiu Yongjin Zou Cuili Xiang Kexiang Zhang Bin Li Huanzhi Zhang Fen Xu Lixian Sun guangxi key laboratory of information materials Guangxi Collaborative Innovation Centre of Structure and Property for New Energy Materialsand School of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin541004China

Silicon-based material is considered to be one of the most promising anodes for the next-generation lithium-ion batteries(LIBs)due to its rich sources,nontoxicity,low cost and high theoretical specific ***,it cannot maintain a stable electrode structure during repeated charge/discharge cycles,and therefore long cycling life is difficult to be *** address this problem,herein a simple and efficient method is developed for the fabrication of an integrated composite anode consisting of SiO-based active material and current collector,which exhibits a core-shell structure with nitrogen-doped carbon coating on SiO/P *** binder and conductive agent,the volume expansion of SiO active material in the integrated composite anode is suppressed to prevent its *** a current density of 500 mA·g−1,this integrated composite anode exhibits a reversible specific capacity of 458 mA·h·g−1 after 200 ***,superior rate performance and cycling stability are also *** work illustrates a potential method for the fabrication of integrated composite anodes with superior electrochemical properties for high-performance LIBs.

关键词： lithium-ion battery silicon monoxide red phosphorus rate performance integrated composite anode

Interfacial defect engineering and photocatalysis properties of hBN/MX_(2)(M=Mo,W,and X=S,Se)heterostructures

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第6期31卷 625-634页

作者： Zhi-Hai Sun Jia-Xi Liu Ying Zhang Zi-Yuan Li Le-Yu Peng Peng-Ru Huang Yong-Jin Zou Fen Xu Li-Xian Sun School of Material Science and Engineering Guilin University of Electronic TechnologyGuangxi Key Laboratory of Information MaterialsGuangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsGuilin 541004China

Van der Waals(VDW)heterostructures have attracted significant research interest due to their tunable interfacial properties and potential applications in many areas such as electronics,optoelectronic,and *** this work,the influences of interfacial defects on the electronic structures and photocatalytic properties of hBN/MX_(2)(M=Mo,W,and X=S,Se)are studied using density functional theory *** results reveal that the band alignment of hBN/MX_(2) can be adjusted by introducing vacancies and atomic *** type-Ⅰband alignment of the host structure is maintained in the heterostructure with n-type doping in the hBN ***,the band alignment changed into the type-Ⅱheterostructrue due to V_(B) defect and p-type doping is introduced into the hBN *** can conduce to the separation of photo-generated electron-hole pairs at the interfaces,which is highly desired for heterostructure *** addition,two Z-type heterostructures including h BN(BeB)/MoS_(2),hBN(Be_(B))/MoSe_(2),and hBN(V_(N))/MoSe_(2)are achieved,showing the decreasing of band gap and ideal redox potential for water *** results reveal the possibility of engineering the interfacial and photocatalysis properties of hBN/MX_(2) heterostructures via interfacial defects.

关键词： hBN/MX_(2)heterostructures interfacial defect electronic state photocatalytic properties

Stabilized multifunctional phase change materials based on carbonized Cu-coated melamine foam/reduced graphene oxide framework for multiple energy conversion and storage

在线全文

学校读者我要写书评

暂无评论

Carbon energy 2022年第6期4卷 1214-1227页

作者： Zhicong Hu Yongjin Zou Cuili Xiang Lixian Sun Fen Xu Menghe Jiang Sensen Yu guangxi key laboratory of information materials Guilin University of Electronic TechnologyGuilinGuangxiPR China guangxi collaborative innovation Center of structure and property for new energy materials GuilinGuangxiPR China

The leakage of organic phase change materials(OPCMs)at temperatures above their melting point severely limits their large-scale *** introduction of porous supports has been identified as an efficient leakageproofing *** this study,a novel carbonized Cu-coated melamine foam(MF)/reduced graphene oxide(rGO)framework(MF/rGO/Cu-C)is constructed as a support for fabricating stabilized multifunctional *** serves as the supporting material,while rGO and Cu act as functional *** a thermal energy storage material,polyethylene glycol(PEG)is encapsulated into MF/rGO/Cu-C through a vacuum-assisted impregnation method to obtain PEG@MF/rGO/Cu-C composite with excellent comprehensive ***@MF/rGO/Cu-C exhibits high phase change enthalpies of 148.3 J g^(-1)(melting)and 143.9 J g^(-1)(crystallization),corresponding to a high energy storage capability of 92.7%.Simultaneously,MF/rGO/Cu-C endues the composite with an enhanced thermal conductivity of 0.4621Wm^(-1) K^(-1),which increases by 463%compared to that of PEG@***,PEG@MF/rGO/Cu-C displays great light-to-thermal and electric-to-thermal conversion capabilities,thermal cycle stability,light-tothermal cycle stability,and shape stability,showing promising application prospects in different aspects.

关键词： Cu-coated network melamine foam PEG reduced graphene oxide stabilized multifunctional phase change materials