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Controllable Synthesis and magnetic Properties of Monodisperse Fe_3O_4 Nanoparticles

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Chinese Physics Letters 2016年第10期33卷 107-111页

作者：王朱良马慧王芳李敏张利国许小红 key laboratory of magnetic molecules and magnetic information material(Ministry of Education) School of Chemistry and Materials ScienceShanxi Normal University

Magnetite （Fe3O4） nanoparticles with different sizes and shapes are synthesized by the thermal decomposition method. Two approaches, non-injection one-pot and hot-injection methods, are designed to investigate the growth mechanism in detail. It is found that the size and shape of nanoparticles are determined by adjusting the precursor concentration and duration time, which can be well explained by the mechanism based on the LaMer model in our synthetic system. The monodisperse Fe3O4 nanoparticles have a mean diameter from 5nm to 16nm, and shape evolution from spherical to triangular and cubic. The magnetic properties are size-dependent, and Fe3O4 nanoparticles in small size about 5 nm exhibit superparamagnetie properties at room temperature and maximum saturation magnetization approaches to 78 emu/g, whereas Fe3O4 nanoparticles develop ferromagnetic properties when the diameter increases to about 16nm.

关键词： Fe acac in is on of Controllable Synthesis and magnetic Properties of Monodisperse Fe3O4 Nanoparticles

Structure and magnetic Properties of the γ’-Fe4N Films on Cu Underlayers

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Chinese Physics Letters 2015年第8期32卷 148-151页

作者：江凤仙赵烨周国伟张君范九萍许小红 key laboratory of magnetic molecules and magnetic information material(Ministry of Education) School of Chemistry and Materials ScienceShanxi Normal University

The γ＇-Fe4N films on Cu underlayers are deposited on the glass and Si substrates by dc magnetron reactive sputtering. The effects of Cu underlayer on the structure, morphology and magnetic properties of the γ＇-Fe4N films are studied. The single-phase γ＇-Fe4N films with Cu underlayers on the glass substrate are obtained, while the mixture of Fe and γ＇-Fe4N is observed on the Si substrate. In comparison with the films without Cu underlayers, the grains of the films with Cu underlayers exhibit a non-uniform size distribution and give rise to a rougher surface. The magnetic measurements indicate that the γ＇-Fe4N films show a good soft ferromagnetic behavior. The enhanced coercivity in the films with Cu underlayers is observed due to the deterioration of the crystallographic structure as well as the rougher surface.

关键词： Fe4N Films on Cu Underlayers Cu Structure and magnetic Properties of the

Synergistic effect of Ni^(Ⅱ)and Co/Fe^(Ⅲ)in doped mixed-valence phosphonate for enhancing electrocatalytic oxygen evolution

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Green Energy & Environment 2022年第3期7卷 432-439页

作者： Juan-Juan Hou Jian-Tao Yuan Wei Zhang Ying-Xia Wang Xian-Ming Zhang key laboratory of magnetic molecules and magnetic information materials(Ministry of Education) School of Chemistry and Material ScienceShanxi Normal UniversityLinfen041004China

Metal organophosphonates have been explored in energy-related fields due to their high chemical and thermal stability as a type of uniformly precursor,but only few of pristine metal organophosphonate are directly used for oxygen evolution reaction(OER)***,a mixedvalence iron phosphonate(Fe_(3)-ppat)has been constructed and applied to OER catalysis considered the potential active sites in pillars Fe^(Ⅱ)(-H_(2)O)_(4)(COO)_(2)and inorganic layers Fe^(Ⅲ)(μ_(2)–OH)PO_(3).Specifically,isostructural trimetallic framework Fe_(1.7)Co_(0.3)Ni_(1.0)-ppat possesses a minimum overpotential(291 mV),small Tafel slope(91.65 mV dec^(-1)),and high stability up to 83 *** enhanced catalytic performance could be mainly ascribed to the synergistic effect of Ni^(Ⅱ)equivalent occupancy in pillars and Co/Fe^(Ⅲ)in layers.

关键词： phosphonate stability organo

Grain boundary-induced drastic sensing performance enhancement of Fe_(2)O_(3) gas sensors for acetone

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Rare Metals 2024年第9期43卷 4412-4424页

作者： Tian-Jun Hu Yi-Fan Li Yu-Zhu Tian Ying Wang Ya-Ru Chen Jun-Ming Zhang Er-Gui Luo Jian-Feng Jia key laboratory of magnetic molecules&magnetic information materials Ministry of Education School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030032China

Exploring the structure-activity relationship between the performance of gas sensors and the structure of semiconductor metal oxide(SMO)nanomaterials is crucial for understanding and designing gas-sensing materials and overcoming the application limitations of SMO-based gas *** of a single SMO microstructure provides a promising solution to address this scientific problem due to its controllable *** this study,we control the grain boundary(GB)density of Fe_(2)O_(3)nanomaterials using a simple solvothermal *** have similar chemical compositions and crystal phases,providing an ideal platform for studying the influence of the GB density on the gas-sensing ***-sensing tests showed that the Fe_(2)O_(3)-1 sensor with medium GB density and the Fe_(2)O_(3)-2 sensor with high GB density had higher sensitivity and selectivity than the Fe_(2)O_(3)-0 sensors with low GB density before reaching the optimal operating ***,when the GB density increased,the response to acetone decreased slightly,whereas the optimal operating temperature *** work highlights the unique performance of the GB density in enhancing the gas sensitivity of a single SMO.

关键词： Semiconductor metal oxide(SMO) Grain boundary(GB)density Oxygen adsorption Charge transfer Gas sensors

Flexible Organic Single Crystal with Elastic Bending and Plastic Twisting Capabilities

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Chinese Journal of Structural Chemistry 2022年第12期41卷 4-6页

作者： Jiang Peng Wanjun Zhao Jing Zhang Chuchu Han Junhui Jia Tingting Feng Jiawen Sun key laboratory of magnetic molecules and magnetic information material Ministry of EducationCollege of Chemistry and Material ScienceShanxi Normal UniversityTaiyuan 030000China

INTRODUCTION Organic single crystals have found wide-spread applications in smart materials,[1]optical waveguide devices,[2]photonic applications,[3]lasers,[4]OLED materials,and so on.

关键词： waveguide Crystal OLED

Performance improvement of Sb2Se3 thin-film solar cells through ultraviolet ozone treatment

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Rare Metals 2022年第8期41卷 2671-2679页

作者： Jian-Min Wu Yan-Ping Lv Jin-Zeng Wang Liu Yang Fang Wang Hao Wu Xiao-Hong Xu key laboratory of magnetic molecules and magnetic information materials Ministry of EducationSchool of Chemistry and Materials ScienceShanxi Normal University

Antimony selenide（Sb2Se3） is a promising photovoltaic thin-film absorber material that has been widely studied in recent *** Sb2Se3thin-film solar cells,cadmium sulfide（CdS） is generally used for the fabrication of electron collection layers because of its high electron affinity,electronic mobility,and environmental *** study demonstrates the effects of ultraviolet ozone（UVO） treatment of chemical-bath-deposited CdS thin films on film crystallinity,surface morphology,and photoelectric *** find that UVO treatment not only enhances the crystallinity,transmittance,and conductivity of the CdS film,but it also decreases residual organic impurities on the CdS surface significantly,substantially improving the overall device *** efficiency of the superstrate CdS/Sb2Se3heterojunction solar cell reaches to 4.66%.This UVO treatment is a facile,low-cost,and fast process,which can be performed at room *** study demonstrates a good method for optimizing the performance of CdS/Sb2Se3solar cells and is expected to find wide applications in the future.

关键词： Thin-film solar cells CdS buffer layer Ultraviolet ozone treatment Sb_2Se_3

Interface engineering of Co_(3)O_(4)-SmMn_(2)O_(5) nanosheets for efficient oxygen reduction electrocatalysis

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Frontiers of materials Science 2021年第4期15卷 567-576页

作者： Ying WANG Fan LIU Hongjie YUAN Tianjun HU key laboratory of magnetic molecules&magnetic information materials(Ministry of Education) School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030006China

Interface engineering is an efficient strategy to modify electronic structure and further improve electrocatalytic ***,crystalline/amorphous heterostructured Co3O4-SmMn2O5 nanosheets(Co3O4-SMO NSs)have been synthesized by coupling of SMO(electron acceptor)with higher Fermi-level Co3O4(electron donor),via a one-step hydrothermal method followed by *** resulting Co3O4-SMO NSs display higher half-wave potential and specific activity than those of pure SMO or *** addition,Co3O4-SMO NSs exhibit superior stability and methanol *** crystalline/amorphous heterostructure and the electron interaction between SMO and Co3O4 result in interfacial charge *** leads to more active valence states and more oxygen vacancies,optimizing the adsorption energy of O species and expediting electron migration,thus boosting oxygen reduction reaction(ORR)catalytic *** study provides a promising strategy to design efficient ORR electrocatalysts by interfacial engineering.

关键词： mullite oxide interfacial engineering work function oxygen reduction

Diluted magnetic oxides

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Science China(Physics,Mechanics & Astronomy) 2013年第1期56卷 111-123页

作者： LI XiaoLi QI ShiFei JIANG FengXian QUAN ZhiYong XU XiaoHong School of Chemistry and materials Science Key Laboratory of Magnetic Molecules and Magnetic Information MaterialsMinistry of EducationShanxi Normal University

In this review,we review the progress of research on ZnO-and In2O3-based diluted magnetic oxides(DMOs).Firstly,we present the preparation and characterization of *** former includes the preparation methods and conditions,and the latter includes the characterization techniques for measuring ***,we introduce the magnetic and transport properties of DMOs,as well as the relationship between ***,the origin and mechanism of the ferromagnetism are ***,we introduce other related work,including computational work and pertinent heterogeneous structures,such as multilayers and magnetic tunnel ***,we provide an overview and outlook for DMOs.

关键词： diluted magnetic oxide preparation magnetism transport

Cobalt-iron oxide/black phosphorus nanosheet heterostructure:Electrosynthesis and performance of(photo-)electrocatalytic oxygen evolution

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Nano Research 2023年第5期16卷 6057-6066页

作者： Man Zhao Xiaoru Cheng He Xiao Jianru Gao Shoufeng Xue Xiaoxia Wang Haishun Wu Jianfeng Jia Nianjun Yang key laboratory of magnetic molecules&magnetic information materials Ministry of Education The School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030000China Institute of materials Engineering University of SiegenSiegen 57076Germany

Highly active,stable,and cut-price(photo-)electrocatalysts are desired to overwhelm high energy barriers for anodic oxygen evolution reaction ***,a heterostructure of cobalt-iron oxide/black phosphorus nanosheets is in-situ synthesized via a facile and novel three-electrode electrolysis *** black phosphorus is exfoliated into its nanosheets at the cathode while the CoFe oxide is derived directly from the metal wire anode during the electrolysis *** heterostructure exhibits excellent electrocatalytic oxygen evolution reaction(OER)performance,and the overpotential at 10 mA·cm^(−2)is 51 mV lower than that of the commercial RuO_(2)*** superior OER performance stems from the favorable adsorption behavior and an enlarged electrochemical active surface area of the *** reveal the origin of excellent OER performance from the point of adsorption strength of OH*,methanol oxidation reaction(MOR)test is applied under the identified OER operating *** introduction of light illumination enhances the OER activity of this *** overpotential drops down to 280 mV,benefiting from pronounced photochemical response of black phosphorus nanosheets and iron oxide inside the *** work develops a new electrochemical method to construct high performance and light-sensitive heterostructures from black phosphorus nanosheets for the OER.

关键词： electrosynthesis oxygen evolution reaction black phosphorus cobalt oxide iron oxide