检索结果-南通市图书馆

Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 433-436页

作者： CHEN ChangCheng xie erqing School of Materials Science and Engineering Georgia Institute of Technology School of Physical Science and Technology Lanzhou University

M2SisN8：Eu2＋-based （M=Ca, Sr, Ba） red-emitting phosphors are fabricated at relatively low temperature （1200℃） and atmos- pheric pressure using a simple solid-state reaction process. Several processing parameters are systematically investigated to optimize the phosphors structural characterization and photoluminescence performance, including the amount of europium and the properties of the precursor materials. The as-prepared M2SisNs：Eu2＋-based （M=Ca, Sr, Ba） phosphors are orange in color and are intensively emitted in the red region of 580-670 nm under 465 nm excitation.

关键词： M2SisN8:Eu2+-based phosphors nitrate reduction luminescence

Cu_2ZnSnS_4 thin films prepared by sulfurization of ion beam sputtered precursor and their electrical and optical properties

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第z1期25卷 315-319页

作者： ZHANG Jun SHAO Lexi FU Yujun xie erqing School of Physics Science and Technology Zhanjiang Normal University Zhanjiang 524048 China School of Physics Science and Technology Lanzhou University Lanzhou 730000 China School of Physics Science and Technology Zhanjiang Normal University Zhanjiang 524048 China School of Physics Science and Technology Lanzhou University Lanzhou 730000 China School of Physics Science and Technology Lanzhou University Lanzhou 730000 China

Cu2ZnSnS4 (CZTS) thin films were successfully prepared by sulfurization of ion bean sputtered precursors on soda-lime glass substrate. The single phase of stannite-type structure CZTS films were obtained as revealed in EDS and XRD analysis when the ratios of the constituents of CZTS thin films are close to stoichiometric by optimizing the conditions of precursor preparation and sulfurization. A low sheet resistivity as about 0.156 Ω·cm and a high absorption coefficient as 1×104 cm-1 were achieved in this method by Hall effect measurements and UV-VIS spectrophotometer. The optical band-gap energy of the CZTS sample is about 1.51 eV, which is very close to the optimum value for a solar-cell absorber.

关键词： Cu2ZnSnS4 thin film solar-cell ion beam sputtering

The thermodynamically directed dendrite-free lithium metal batteries on LiZn alloy surface

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第6期16卷 8354-8359页

作者： Huanqin Zheng Xu Cheng Quan Zheng Jianjun Zhang Tao Li erqing xie Ying Xu School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China School of Materials and Energy Lanzhou UniversityLanzhou 730000China Southeast Research Institute of Lanzhou University Fujian 351100China

Metical lithium(Li)is one of the most promising alternatives as an anode in next-generation high energy batteries for its high theoretical specific capacity and low redox ***,severe Li dendrite growth leading to poor stability and safety issues hinders its practical ***,three-dimensional carbon cloth(CC)with full zinc oxide quantum dots(ZnO QDs)covering is rationally chosen as the substrate for the suppression of Li *** to the spontaneous reaction between ZnO QDs and molten Li,LiZn alloy is formed and covered on CC,which endows substrate with high affinity for Li adsorption and suitable barrier energy for Li *** thermodynamic regulation on substrate is beneficial for homogeneous Li nucleation and deposition,thus enabling high stability for over 1,900 h at ultrahigh current density of 10 mA∙cm^(−2) in symmetrical cell and delivering superior performance in full batteries.

关键词： LiZn alloy adsorption energy diffusion barrier dendrite-free Li metal batteries

Influence of temperature on the microstructure of V_2O_5 film prepared by DC magnetron sputtering

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

Rare Metals 2006年第z1期25卷 82-87页

作者： SU Qing PAN Xiaojun xie erqing WANG Yinyue QIU Jiawen LIU Xueqin Department of Physics Lanzhou University Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Lanzhou Institute of Physics Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Lanzhou Institute of Physics Lanzhou 730000 China

V2O5 films were prepared on silicon wafers by DC magnetron sputtering and post-annealing under various conditions. The influence of depositing and post-annealing temperatures on microstructure of V2O5 films was studied by XRD and Raman scattering measurements. The results reveal that sputtered V2O5 films show preferred growth orientation along (001) planes and the c-axis is perpendicular to the silicon substrate surface. It is interesting to find that both the V2O5 film deposited at temperature of 511 ℃ and the one annealed at 500 ℃ exhibit desirable layer-type structure of orthorhombic symmetry. Such layer-typed V2O5 films are promising candidates for cathodes of rechargeable lithium or magnesium thin-film batteries.

关键词： V2O5 films sputtering raman XRD microstructure

High-performance magnesium ion asymmetric Ppy@FeOOH//Mn3O4 micro-supercapacitor

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第9期31卷 352-360,I0010页

作者： Xueliang Lv Yaxiong Zhang Xijuan Li Zhiye Fan Guo Liu Wenjian Zhang Jinyuan Zhou erqing xie Zhenxing Zhang Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000GansuChina

Micro-supercapacitors(MSCs)are attractive electrochemical energy storage devices owing to their high power density and extended cycling ***,relatively low areal energy density still hinders their practical ***,an asymmetric Mg ion MSC with promising high energy density is ***,indium tin oxide(ITO)NWs were synthesized by chemical vapor deposition as the excellent current ***,nanostructured Mn_(3)O_(4)and Ppy@FeOOH were deposited on the laser-engraved interdigital structure ITO NWs electrodes as the positive and negative electrodes,*** from the hierarchical micro-nano structures of active materials,high conductive electron transport pathways,and charge-balanced asymmetric electrodes,the obtained MSC possesses a high potential window of 2.2 V and a high areal capacitance of 107.3 mF cm^(-2)at 0.2 mA cm^(-2).The insitu XRD,VSM,and ex-situ XPS results reveal that the primary energy storage mechanism of Mg ions in negative FeOOH electrode is Mg ions de-/intercalation and phase transition reaction of ***,the MSC exhibits a high specific energy density of 71.18μWh cm^(-2)at a power density of 0.22 mWh cm^(-2)and capacitance retention of 85%after 5000 cycles with unvaried Coulombic *** results suggest promising applications of our MSC in miniaturized energy storage devices.

关键词： CVD Iron hydroxide Electrochemical deposition Asymmetric micro-supercapacitor Laser engraving

Aqueous Zn-MnO_(2) battery: Approaching the energy storage limit with deep Zn^(2+) pre-intercalation and revealing the ions insertion/extraction mechanisms

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第4期31卷 225-232页

作者： Yaxiong Zhang Xiaosha Cui Yupeng Liu Situo Cheng Peng Cui Yin Wu Zhenheng Sun Zhipeng Shao Jiecai Fu erqing xie Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000GansuChina

Rechargeable aqueous zinc ion batteries(AZIBs)were considered as one of the most promising candidates for large-scale energy storage due to the merits of high safety and *** AZIBs cathode material,Mn O_(2)possesses great merits but was greatly hindered due to the sluggish diffusion kinetic of Zn^(2+) during electrochemical ***,deep Zn^(2+) ions intercalatedδ-Mn O_(2)(Zn-Mn O_(2))was achieved by the in situ electrochemical deposition route,which significantly enhanced the diffusion ability of Zn^(2+) due to the synergistic effects of Zn^(2+) pillars and structural H;*** resultant Zn-Mn O_(2)based AZIBs delivers a record capacity of 696 m Ah/g(0.5 m Ah/cm^(2))based on the initial mass loading,which is approaching the theoretical capacity of Mn O_(2)with a two-electrons ***-situ Raman studies reveal highly reversible Zn^(2+)ions insertion/extraction behaviors and here the Zn-Mn O_(2)plays the role of a container during the charge–discharge *** charge storage mechanism investigations point out the insertion/extraction of Zn^(2+) and H^(+) coincides,and such process is significantly facilitated results from superior interlayered configurations of Zn-Mn O_(2)The excellent electrochemical performance of Zn-Mn O_(2)achieved in this work suggests the deep ions pre-intercalation strategy may aid in the future development of advanced cathodes for AZIBs.

关键词： Aqueous zinc ion batteries Deep Zn^(2+)intercalated MnO_(2) Interlayer distance engineering Ions insertion/extraction mechanisms

22 AMeV Fe Ions Induced Irradiation Damage in C60 Films: a Raman spectra study

在线全文

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 2004年 86-87页

作者： xie erqing School of Physical Science and Technology Lanzhou University Lanzhou 730000 China

In order to investigate the structural stability of fullerene (C60) under swift heavy ion irradiation, the irradiation experiments of thin C60 films were performed with 22 AMeV 56Fe ions delivered by HIRFL. The flux was not more than 1×108 ions/cm2·s to limit thermal effects during irradiation. The irradiation fluences were 5×1010- 8×1013 ions/cm2.

关键词：

One dimensional CeO_(2) nanorods/poly(ethylene oxide) solid composite electrolyte for all-solid-state lithium-ion batteries

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 Rare Earths 2024年第3期42卷 570-577,I0005页

作者： Yudi Guo erqing Zhao Xiaofang Zhao Shuailei Liu School of Chemistry and Materials Engineering Xinxiang UniversityXinxiang453003China School of Chemistry and Chemical Engineering Henan Institute of Science and TechnologyXinxiang453003China

The research of poly(ethylene oxide)(PEO)-based solid composite electrolyte with high ionic conductivity and excellent interfacial stability is the key to the development of all-solid-state lithium-ion batteries(ASSLIBs). Herein, uniform nanorod structured CeO_(2) fillers were controllably synthesized by electrospinning, which were subsequently filled into PEO polymer to prepare CeO_(2)/PEO solid composite electrolyte. The addition of CeO_(2) nanorods can reduce both the glass transition temperature and the melting point of PEO polymer, and also interact with PEO and lithium bis(trifluoromethanesulphonyl)imide(LITFSI) by Lewis acid—base reaction. Therefore, the solid composite electrolyte exhibits a high ionic conductivity of 4.52 × 10^(-4)S/cm, a wide electrochemical stability window of about 4.8 V, and a good interfacial stability with Li at 55℃. Moreover, the LiFePO_4/Li ASSLIB divulges the discharging specific capacity of 165, 162, 156 and 146 mA,h/g at 0.2, 0.5, 1 and 2 C, respectively, and achieves the capacity retention of 90.3% after 150 cycles at 0.5 C. Consequently, one dimensional CeO_(2) nanorods can be considered as an alternative filler for polymeric solid electrolyte.

关键词： Poly(ethylene oxide) Solid composite electrolyte CeO_(2)nanorods Ionic conductivity Rare earths

在线全文

学校读者我要写书评

暂无评论

HfOxNy栅介质薄膜的电学特性

Journal of Semiconductors 2006年第Z1期27卷 172-174页

作者：蒋然谢二庆兰州大学物理科学与技术学院兰州730000 兰州大学物理科学与技术学院兰州730000

用直流溅射方法制备了HfOxNy薄膜,对其电学特性和导电机理进行了研究.实验结果表明,引入铪缓冲层并在氮气中退火有助于改善电学性能.研究了薄膜在电场下的漏电机理,发现在负向低电场下I-V特性遵从欧姆规律,在中强电场下导电机制遵从空... 详细信息

用直流溅射方法制备了HfOxNy薄膜,对其电学特性和导电机理进行了研究.实验结果表明,引入铪缓冲层并在氮气中退火有助于改善电学性能.研究了薄膜在电场下的漏电机理,发现在负向低电场下I-V特性遵从欧姆规律,在中强电场下导电机制遵从空间电荷限制电流理论.

关键词： HfOxNy 溅射空间电荷限制电流离子跳跃电导

Experiment and constitutive modelling of creep deformation in the frozen silt-concrete interface

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

Journal of Mountain Science 2024年第9期21卷 3172-3185页

作者： HE Fei LIU Qingquan LEI Wanyu WANG Xu MAO erqing LI Sheng CHEN Hangjie School of Civil Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province Lanzhou 730070China

To ensure the long-term safety and stability of bridge pile foundations in permafrost regions,it is necessary to investigate the rheological effects on the pile tip and pile side bearing *** creep characteristics of the pile-frozen soil interface are critical for determining the long-term stability of permafrost pile *** study utilized a self-developed large stress-controlled shear apparatus to investigate the shear creep characteristics of the frozen silt-concrete interface,and examined the influence of freezing temperatures(−1,−2,and−5°C),contact surface roughness(0,0.60,0.75,and 1.15 mm),normal stress(50,100,and 150 kPa),and shear stress on the creep characteristics of the contact *** incorporating the contact surface’s creep behavior and development trends,we established a creep constitutive model for the frozen silt-concrete interface based on the Nishihara model,introducing nonlinear elements and a damage *** results revealed significant creep effects on the frozen silt-concrete interface under constant load,with creep displacement at approximately 2-15 times the instantaneous displacement and a failure creep displacement ranging from 6 to 8 *** different experimental conditions,the creep characteristics of the frozen silt-concrete interface varied.A larger roughness,lower freezing temperatures,and higher normal stresses resulted in a longer sample attenuation creep time,a lower steady-state creep rate,higher long-term creep strength,and stronger creep *** upon the Nishihara model,we considered the influence of shear stress and time on the viscoelastic viscosity coefficient and introduced a damage factor to the *** improved model effectively described the entire creep process of the frozen silt-concrete *** results provide theoretical support for the interaction between pile and soil in permafrost regions.

关键词： Creep characteristics Contact surface Frozen silt Constitutive model Freezing temperature