TiO2纳米薄膜的制备与氧敏性能的研究

本文通过Sol-gel法在Al2O3基片上制得了TiO2纳米薄膜，经XRD分析，薄膜具有多晶结构，其主晶相为金红石，本实验还对TiO2薄膜的氧敏特性进行了研究，实验结果表明，TiO2纳米薄膜在800度下具有良好的氧敏特性和重复性，并且具有较快的响应速度。     

TiO_(2-x)纳米粒子薄膜型氧敏元件的性能

以钛酸丁酯和无水乙醇分别为前驱体和溶剂 ,添加适量稳定剂制成稳定溶胶 ,用浸涂法在 Al2 O3基片上制备 Ti O2 薄膜 ,经在 10 0 0℃氢气氛下还原制得 Ti O2 - x薄膜 .通过 SEM照片发现薄膜颗粒在几十纳米左右 ,颗粒分布均匀 .由 XRD分析 ,薄膜的 x值在 0～ 0 .5之间 .实验结果表明 ,Ti O2 - x薄膜在 80 0℃下具有良好的氧敏感性和响应特性 ,薄膜在 N2 条件下具有很好的电阻 -温度特性     

LaNiO3纳米陶瓷薄膜氧敏特性的研究

以La(NO3)3.6H2O和Ni(NO3)2.6H2O,为原料,采用柠檬酸为螯合剂,利用溶胶－凝胶法合成了钙钛矿型稀土复合氧化物LaNiO3纳米陶瓷薄膜,研究了薄膜的氧敏特性及烧成温度和掺杂对薄膜氧敏特性的影响。     

LaNiO_3纳米陶瓷薄膜氧敏特性的研究

以 L a(NO3) 3· 6 H2 O和 Ni(NO3) 2 · 6 H2 O为原料 ,采用柠檬酸为螯合剂 ,利用溶胶 -凝胶法合成了钙钛矿型稀土复合氧化物 L a Ni O3纳米陶瓷薄膜 ,研究了薄膜的氧敏特性及烧成温度和掺杂对薄膜氧敏特性的影响     

掺Fe3+TiO2薄膜型氧气传感器研究

讨论了TiO2对氧气的吸附过程及敏感机理,重点分析了掺铁对氧敏特性的影响.设计出了基于Ti02薄膜结构氧气传感器,通过硅工艺制作了Fe3+掺杂的TiO2薄膜型氧气传感器、并在400℃下对传感器的氧敏特性进行了测试.实验结果表明,该氧气传感器在高温条件下对氧气含量的变化有明显的响应,且具有低电阻的特性.     

TiO_2纳米晶薄膜电极的瞬态光电流特性

采用 Ti Cl4 水解法制备 Ti O2 纳米微粒 ,并研究这种微粒形成的纳米晶薄膜电极的瞬态光电流特性 .利用能带模型和循环伏安特性讨论 Ti O2 纳米晶薄膜电极光生电荷的产生及转移动力学规律 .     

HfO_x缓冲层对γ-Fe_2O_3纳米微粒膜电阻开关特性的影响

本文利用射频磁控溅射和滴涂法在Pt/Ti/SiO2/Si衬底上制备了HfOx/γ-Fe2O3/HfOx三明治结构,研究了HfOx缓冲层对γ-Fe2O3纳米微粒薄膜电阻开关特性的影响.微结构观测分析结果显示:γ-Fe2O3纳米微粒平均粒径约为34.3 nm,HfOx缓冲层为氧配比不足的单斜相多晶薄膜.电学性能测试表明:插入HfOx缓冲层后,γ-Fe2O3纳米微粒薄膜的电阻开关特性明显改善:在-0.8 V读取电压下,高/低电阻态阻值平均比值约为18.7,该比值可稳定维持100个循环周期.指数定律拟合实验曲线结果表明:高阻态漏电流以缺陷主导的空间电荷限制隧穿电流为主;而低阻态则以欧姆接触电导为主.Ag上电极与HfOx缓冲层界面处氧离子的定向漂移使得薄膜中氧空位缺陷形成的导电细丝通道周期性地导通与截断,从而使得薄膜呈现电阻开关效应.     

水热法合成染料敏化太阳能电池薄膜电极及其性能

目的研究不同水热反应条件对薄膜太阳能电池性能的影响,使其光电转换效率达到较高水平.方法采用通常的水热合成方法制备纳米Ti O2和掺Zn2+纳米Ti O2,用其组装染料敏化太阳能电池,利用紫外可见光谱测试分析不同薄膜样品对染料的吸附量和吸光特性,利用标准太阳光模拟器和数字源表测定电池的光电转换效率,利用扫描电子显微镜观察薄膜形貌.结果用180℃水热反应12 h合成的纳米Ti O2制作成的电池,所得光电转换效率最高可达到4.00%.用200℃水热反应12 h并且掺杂Zn2+的纳米Ti O2制作成的电池,所得光电转换效率最高可达3.65%.纳米Ti O2薄膜对染料的吸附量最高可达2.51×10-7mol/cm2.结论扫描电镜观察揭示出样品的孔结构丰富,有较小的粒径,说明水热合成法制备的纳米Ti O2薄膜电极具有较大的比表面积.当230℃水热反应12 h时,Ti O2薄膜对染料的吸附量最大.当180℃水热反应12 h时,染料敏化太阳能电池的光电转换效率最大.Zn2+的掺杂并未改善薄膜电极的光电特性.     

NiO-TiO_2纳米复合薄膜的阻变特性

利用溶胶凝胶法制备了不同n(Ni)/n(Ti)比的Ni O-TiO_2复合薄膜,电学测试表明薄膜具有可重复双极阻变特性,且开关比与Ni O薄膜相比有显著提升.400℃退火n(Ni)/n(Ti)为7∶1的样品阻变阈值电压低、开关比高且稳定性好,原因是Ni O-TiO_2薄膜可形成P-N结纳米结构.焦耳热分析表明薄膜荷电输运属于热激发,高阻态符合由氧空位缺陷俘获电荷所致空间电荷限制导电机制,低阻态为欧姆特性,阻变机理为电荷俘获及再释放.     

BZT 25纳米粉体的制备及PVDF/BZT 25纳米复合材料的介电性能

通过一步水热法制备了BaZr0.25Ti0.75O3纳米粉体,所得纳米颗粒为均一球形,含钡、锆、钛和氧4种元素.对其成分分析表明,制备的纳米颗粒对应BaZr0.25Ti0.75O3.通过溶液铸膜法,将BaZr0.25Ti0.75O3纳米颗粒作为填充剂制备了PVDF/BaZr0.25Ti0.75O3纳米复合材料薄膜,并表...     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has