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Twisted Integration of Complex Oxide Magnetoelectric Heterostructures via Water‑Etching and Transfer Process

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Nano-Micro Letters 2024年第1期16卷 360-369页

作者： Guannan Yang guohua dong Butong Zhang Xu Xu Yanan Zhao Zhongqiang Hu Ming Liu State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research LaboratoryKey Laboratory of the Ministry of EducationEngineering Research Center of Spin Quantum Sensor ChipsUniversities of Shaanxi ProvinceSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Manipulating strain mode and degree that can be applied to epitaxial complex oxide thin films have been a cornerstone of strain *** recent years,lift-off and transfer technology of the epitaxial oxide thin films have been developed that enabled the integration of heterostructures without the limitation of material types and crystal ***,twisted integration would provide a more interesting strategy in artificial magnetoelectric heterostructures.A specific twist angle between the ferroelectric and ferromagnetic oxide layers corresponds to the distinct strain regulation modes in the magnetoelectric coupling process,which could provide some insight in to the physical *** this work,the La_(0.67)Sr_(0.33)MnO_(3)(001)/0.7Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.3PbTiO_(3)(011)(LSMO/PMN-PT)heterostructures with *** *** angles were assembled via water-etching and transfer *** transferred LSMO films exhibit a fourfold magnetic anisotropy with easy axis along LSMO.A coexistence of uniaxial and fourfold magnetic anisotropy with LSMO[110]easy axis is observed for the 45°Sample by applying a 7.2 kV cm^(−1)electrical field,significantly different from a uniaxial anisotropy with LSMO[100]easy axis for the 0°*** fitting of the ferromagnetic resonance field reveals that the strain coupling generated by the 45°twist angle causes different lattice distortion of LSMO,thereby enhancing both the fourfold and uniaxial *** work confirms the twisting degrees of freedom for magnetoelectric coupling and opens opportunities for fabricating artificial magnetoelectric heterostructures.

关键词： Magnetoelectric heterostructures Twist angle Epitaxial lift-off Magnetic anisotropy Ferromagnetic resonance

Large electrical strain in lead-free K_(0.5)Na_(0.5)NbO_(3)-based ceramics by heterovalent doping

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Journal of Materiomics 2023年第5期9卷 959-970页

作者： Xiangjian Wang Jun Wang Wenping Geng guohua dong Brahim Dkhil Xiaojie Lou Department of Information Engineering Quzhou College of TechnologyQuzhou324000China Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an710049China Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan030051China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchXi'an Jiaotong UniversityXi'an710049China Applied Physics Division of Materials ScienceDepartment of Engineering Sciences and MathematicsLuleåUniversity of TechnologySE-97187LuleåSweden Laboratoire Structures Proprietes et Modelisation des SolidesUniversite Paris SaclayCentraleSupelecCNRS-UMR8580Grande Voie des VignesCh^atenay MalabryCedex92295France

Heterovalent doped(K_(0.48-0.07)xNa_(0.52-0.43)xBi_(0.5)x)(Nb_(0.95-0.95x)Sb_(0.05-0.05x)Zrx)O_(3)ceramics were fabricated using conventional solid-state ***,the phase structures,dielectric,ferroelectric,and electricstrain properties were *** compositions were tuned to be located at polymorphic phase boundary with increasing heterovalent Bi3t and Zr4t doping levels.A large strain of 0.19%was obtained at relatively low electric fields of 30 kV/cm in the composition of x=*** normalized large-signal d33*values were approximately 633 pm/V under a low driving electric field of 30 kV/cm,which were comparable or larger than the values reported for other lead-free *** large strains obtained can be attributed to the formation of nanodomains and high-density domain walls,which were confirmed by the observations of domain morphology using transmission electron microscopy(TEM)*** temperature stability of the strain properties of the x=0.04 sample could be ascribed to the sluggish behaviour for the local structural heterogeneity in heterovalent-ion doped KNN *** simulations revealed that the Zr^(4t)produce the local stress at the BO6 octahedra and Bi3t could yield off-centering of AO12 ployhedron due to the nature of Bi 6s lone pair electrons,which induced lattice expansion and local distortions in the *** local displacements are strongly anisotropic in heterovalent-ion doped *** is believed that random local fields exist in these compositions owing to the eixstence of charge *** heterovalent doping of Bi^(3t)and Zr^(4t)could destory simultaneously the orthorhombic symmetry and the short-range ferroelecctric order,leading to the formation of complex nanodomains and local structral *** doping may,therefore,offer a new avenve to design novel K0.5Na0.5NbO3(KNN)-based materials for their mutifunctional applications.

关键词： Lead-free Strain Heterovalent doping Local structure Nanodomain

Synthesis of Bis-benzimidazolium Cyclic Receptors and Their Anion Binding Properties

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Chinese Journal of Chemistry 2013年第5期31卷 673-678页

作者： Xiaozhi Jiang Meiyun Feng Dawei Zhang Binshen Wang Zhiyun dong guohua Gao Shanghai Key Laboratory of Green Chemistry and Chemical Processes Department of Chemistry East China Normal University 3663 North Zhongshan Road Shanghai 200062 China

A series of cyclic receptors 1--5 based on bis-benzimidazolium group were designed and synthesized. Their anion recognition properties were investigated by UV-vis, fluorescent spectroscopy, 1H NMR and MALDI-TOF mass spectrometry. The UV-vis and fluorescent spectroscopic studies showed that the receptors 1--5 had different binding abilities for various anions such as fluoride, chloride, bromide, iodide and acetate. The high selectivity of the receptors for fluoride and acetate anions is attributed to their basicity. Job plot and MALDI-TOF mass spec- trometry demonstrated that the receptors form 1 ： 1 complex with fluoride. DFT calculation and 1H NMR studies indicated that the receptors bind anions through （C--H）＋…X- hydrogen bond.

关键词： cyclic ionic receptors bis-benzimidazolium anion recognition hydrogen bond

Recent Progress in the Application of Polyoxometalates for Dye-sensitized/Organic Solar Cells

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Chinese Journal of Chemistry 2016年第8期34卷 747-756页

作者： Tengling Ye Junhai Wang guohua dong Yanxia Jiang Chen Feng Yulin Yang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 China College of Chemistry and Chemical Engineering Qiqihar University Qiqihar Heilongjiang 161006 China

At present, high efficiency and low fabrication cost are still the main goal that people pursuit for next-generation solar cells such as dye-sensitized solar cells (DSSCs) and organic solar cells (OPVs). Polyoxometalates (POMs), as an environmentally friendly material, are a type of stable, low cost and soluble oxide clusters with desirable features, including highly tunable structural properties, peculiar optoelectronic properties and excellent redox properties. Thus, during the recent years, POMs have been increasingly recognized as important building blocks for DSSCs and OPVs. In this review, the development of various molecular and hybrid materials derived from POMs is discussed with regard to the function in solar cells.

关键词： polyoxometalates solar cell optoelectronic devices DSSC OPV

Stress-induced controllable magnetic properties in flexible epitaxial Mn_(0.5)Zn_(0.5)Fe_(2)O_(4) ferrite films

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Journal of Materiomics 2022年第3期8卷 596-600页

作者： Tian Wang guohua dong Yuxuan Ma Haixia Liu Ziyao Zhou Ming Liu Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic and Information EngineeringState Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an710049China

Flexible ferrite film has high potential applications in electronic skins and wearable ***,it is an enormous challenge to fabricate flexible ferrite film because of its high *** work uses a novel etching sacrificial Sr_(3)Al_(2)O_(6)(SAO)layer to synthesize flexible Mn_(0.5)Zn_(0.5)Fe_(2)O_(4)(MZFO)ferrite *** MZFO film remains its single crystal structure after being transferred onto a flexible *** to the great lattice mismatch between SAO and MZFO,the as-grown and transferred MZFO films exhibit the difference in magnetic properties,which is more sensitive along out-of-plane *** controllable magnetic properties of the film under the bending test are characterized by ferromagnetic resonance(FMR).A huge FMR field(Hr)shift of 704 Oe is achieved along out-of-plane direction when the bending radii are 5 ***,the FMR linewidth(dH)of bent MZFO film(1267 Oe)is about 4 times higher than that of the unbent film(310 Oe).These controllable changes mainly come from the contribution of the two magnon scattering(TMS)***,the Hr and dH almost return to their initial states when the stress is released,indicating a great recoverability.

关键词： ferrite film magnetic

Three-dimensional Flower-like Rutile TiO2 Microsphere Composed of Nanorods： a Potential Material as Light Scattering Layer for DSSCs

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Chemical Research in Chinese Universities 2017年第2期33卷 298-304页

作者： Yan Shi (1) Yulin Yang (1) guohua dong (1) (2) Yanxia Jiang (1) Liguo Wei (3) Ting Su (1) Ruiqing Fan (1) 1. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. China 2. College of Chemistry and Chemical Engineering Qiqihar University Qiqihar 161006 P. R. China 3. College of Environmental and Chemical Engineering Heilongjiang University of Science and Technology Harbin 150022 P. R. China

The low spectrum utilization and the recombination of photo-generated electrons are the main challengesfor improving the performance of dye sensitized solar cells（DSSCs）. In this article, a three-dimensional flower-likeruffle titanittm dioxide（TDF-TiO2） was successfully synthesized via a simple sol-thermal process. X-Ray diffractionpatterns（XRD） and scan electron microscopy（SEM） images exhibit that the TDF-TiO2 are the futile TiO2 microspherecomposed of lots of regular cuboid nanorods. Applying this TDF-TiO2 as light scattering layer on the photoanode ofDSSCs, the devices present an excellent photovoltage performance, yielding a power conversion efficiency（PCE） of7.69%, which can be mainly attributed to the enhanced light utilization and the reduced recombination of pho-to-generated electrons upon a combined analysis of electrochemical impedance spectroscopy（EIS）, open-circuit vol-tage decay（OCVD）, and intensity-modulated photocurrent spectroscopy and intensity-modulated photo voltage spec-troscopy（IMPS/1MVS）, etc. As a conclusion, TDF-TiO2 is a potential material as light scattering layer and opticaltransition medium to improve the performance of DSSCs, and this work further demonstrated that regulating themorphology and particle size of TiO2 is an efficient approach for enhancing the performance of DSSCs by optimizingthe utilization of light and the transporting behaviors of photo-generated electrons.

关键词： Dye sensitized solar cell Photoanode Three-dimensional flower-like rutile TiO2 Light scattering layer

4-Tert butylpyridine induced MAPbI3 film quality enhancement for improving the photovoltaic performance of perovskite solar cells with two-step deposition route

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4-Tert butylpyridine induced MAPbI3 film quality enhancement...

机构知识库之组织结构建设问题研究——以党校机构知识库建设为例

第六届新型太阳能电池材料科学与技术学术研讨会

作者： guohua dong Yulin Yang Wenzhi Zhang College of Chemistry and Chemical Engineering Qiqihar University School of Chemistry and Chemical Engineering Harbin Institute of Technology

As we known, high-efficiency of the solution-processed perovskite solar cells can be achieved by modulating the perovskite film quality. Here, the prevalent 4-tert-butylpyridine is firstly utilized as an additive of CHNHI solution for improving the CHNHPbI film quality fabricated with two-step deposition method. Due to the strong polarity and interaction between N atom on TBP and Pb atom on CHNHPbI, this strategy leads to a substantial enhancement of the CHNHPbI film quality with larger grains, higher crystallinity and more complete coverage on the substrate than that of the pristine one. Thereby, the TBP-based CHNHPbI film simultaneously exhibits superior optical properties and surface hydrophobicity. By optimization, the perovskite solar cells fabricated with TBP addition at a volume ratio of 7/1000(v/v, TBP/isopropanol) exhibits significant performance enhancement with a power conversion efficiency reaching 17.06%, while the pristine one merely obtains a lower value of 14.56%. More importantly, this type of cells also shows a desirable efficiency reproducibility and long-time stability in air atmosphere. In conclusion, our work demonstrates another meaningful application for the TBP additive and provides a facile and effective strategy for further improving the performance of perovskite solar cells

关键词： MAPbI3 perovskite solar cells 4-Tert butylpyridine film quality photovoltaic performance

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情报杂志 2014年第4期33卷 174-178,F0003页

作者：董国华海南省委党校图书馆海口571100

相对于机构数量,国内机构知识库建设成熟的依然较少,文章对机构知识库建设存在问题的研究进行了分析,包括内容建设(内容收集、质量控制、版权)、政策、资金、人员配备、宣传推广、与其他信息化系统对接等方面的问题,并对这些问题的解决... 详细信息

相对于机构数量,国内机构知识库建设成熟的依然较少,文章对机构知识库建设存在问题的研究进行了分析,包括内容建设(内容收集、质量控制、版权)、政策、资金、人员配备、宣传推广、与其他信息化系统对接等方面的问题,并对这些问题的解决对策与机构知识库的组织结构建设的相关性进行了分析,提出构建适合的组织结构是机构知识库建设和长期可持续发展的保证。

关键词：机构知识库( IR) 组织结构党校机构知识库可持续发展 institutional repository ( IR)

Insight into the Novel Z-scheme ZIF67/WO3 Heterostructure for Improved Photocatalytic Degradation of Methylene Blue under visible light

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Insight into the Novel Z-scheme ZIF67/WO3 Heterostructure fo...