Au-Pt合金枝状纳米线无酶过氧化氢传感器

通过交流电沉积的方法,在Au微电极表面制备Au-Pt合金枝状纳米线,采用扫描电子显微镜和X射线能谱表征了合金纳米线的形貌和成分.用枝状纳米线构筑成H2O2传感器,研究结果表明,该传感器具有很好的电化学催化性能,对H2O2响应线性范围为20×10-6～8.38×10-3mol.dm-3,检出限可达1.5×10-6mol.dm-3,灵敏度达到129.2μA.dm3.mmol-1.cm-2.对比文献报道同类传感器的性能,该传感器对H2O2传感性能卓越,有良好的应用前景.     

基于声表面波谐振器的三维纳米团簇敏感薄膜关键技术研究

设计了一种新型基于声表面波技术的气体传感器,理论分析了三维纳米线结构的比表面积大、灵敏度高等优点,采用具备高Q值和低插损的谐振型声表面波器件结构,制备了三维敏感膜结构的声表面波气体传感器.在此基础上,为提高吸附效应,对三维纳米线簇进行了修饰改进.通过将沙林气和芥子气注入放置了声表面波的气体传感器密闭腔体内,经过神经网络识别系统进行定性识别.实验结果表明,基于修饰改进后的纳米线簇敏感膜制备的声表面波气体传感器对给定毒气混合气体的整理识别率大于90%,能够满足通用的毒气定性检测要求.并且三维纳米声表面波气敏传感器的灵敏度和响应速度优于传统的传感装置,在识别系统加大样本数据量时,能够进一步提高识别精度.     

铝锑共掺氧化锌纳米线阵列LED发光性能研究

氧化锌(ZnO)纳米线因具有良好的结晶质量和独特的半导体性质,在光电子器件领域有重要应用前景.利用双元素共掺来提高掺杂元素在ZnO内的固溶度,是获得p型导电ZnO材料的有效方法.本文中利用化学气相沉积法制备Al和Sb共掺的p型ZnO纳米线阵列,通过XRD、SEM、EDS和XPS等手段分析共掺ZnO纳米线的形貌、成分和晶体质量,发现共掺ZnO具有良好的(001)晶向外延取向生长特性,且通过调整升温速率可以调控掺杂ZnO纳米线的晶体质量.基于n-GaN衬底外延生长的共掺ZnO纳米线阵列,构建异质结型LED器件.Ⅰ-Ⅴ曲线结果表明,在±4 V电压下,器件整流比高达13.7,纳米线异质结开启电压为3 V,器件表现出良好的pn结电学特性.电致发光(EL)光谱结果显示,共掺ZnO纳米线LED器件发光峰中心波长约为650 nm,表现为橙红光发射.     

基于Pd纳米线的过氧化氢无酶传感器

基于AAO模板采用电化学沉积法在玻碳电极表面制备Pd纳米线,采用扫描电子显微镜表征了纳米线的形貌。用Pd纳米线构建了过氧化氢无酶传感器。研究结果表明：该传感器对过氧化氢（H2O2）具有很好的电化学催化作用。对过氧化氢的响应范围为1.0×10^-5-1.62×10^-3mol/L,检出限达到6.0×10^-6mol/L。该传感器具有较好的稳定性和重现性。     

湖北民族学院国家自然科学基金在研项目

项目：高灵敏超细氧化钨纳米线传感器的制备研究 编号：20871044 主持人：胡卫兵 本项目主要研究用溶剂热法、气固相技术制备超细、高长径比氧化钨纳米线和氧化钨纳米网；探索具有可变高长径比的超细氧化钨纳米线、二维超细氧化钨纳米网和物理、化学改性后的氧化钨纳米线在传感器上的应用；     

基于纳米梳效应构筑单轴取向纳米线自组装薄膜

<正>纳米线是构筑新一代高级材料的重要基础单元.有序排列的纳米线薄膜能够将纳米线一维物理特性转换成宏观的各向异性,从而在面内表现出独特的光学和电学性质,在传感器、微电子、光电转换等领域有广阔的应用前景.然而,长径比较大的纳米线极易发生缠绕,很难获得高度取向的有序排列.虽然科学家     

VO_2纳米线的CVD,水热制备及结构形貌表征

我们采用CVD法,生长出高展弦比的VO2纳米线,并对其形貌、结构进行了表征,讨论了其生长机制.CVD方法生长的VO2纳米线沿着[100]的方向生长,且粗细均匀,具有较高的长径比,表面缺陷少,形貌均一,为制备以之为基元的光电传感器件打下了良好的材料基础.同时对比采用水热方法合成的VO2纳米线,探讨了两种方法生成产物在形貌上的差别及对器件性能可能产生的影响.     

基于氧化物半导体纳米线的气体传感器

纳米技术是21世纪一个重要的新兴科研领域,最近几年,大量的新型纳米结构与功能器件不断被研发出来,并在信息、医学以及国防等各个领域中展现出前所未有的应用前景。在各种纳米材料中,以ZnO纳米线、纳米带为典型代表的准一维纳米结构最为引人关注。2004年前,各国科研人员主要关注ZnO准一维纳米结构的制备和结构表征,由于研究手段的局限很少涉及ZnO纳米器件的研究。最近几年,以场效应晶体管、传感器为代表的功能器件应用成为纳米结构的研究热点。     

Si纳米线器件及其研究进展

Si纳米线是一种新型的准一维纳米半导体材料,具有独特的电子输运特性、场发射特性和光学特性等.本文对利用Si纳米线制备的各类电子器件,例如存储器、场效应晶体管、化学传感器和太阳能电池的研究进展做了简要评述.最后,对Si纳米线的应用前景进行了初步展望.     

基于ZnO/SiNWs异质结阵列的电容式湿度传感器

采用湿法化学刻蚀方法制备硅纳米线（SiNWs）,对其进行快速热退火处理,利用水浴法在SiNWs表面生长氧化锌（ZnO）纳米线,制备了ZnO/SiNWs异质结湿度传感器.采用扫描电子显微镜（SEM）和X射线衍射仪（XRD）分析了ZnO/SiNWs异质结的表面形貌和结构.测试了ZnO/SiNWs异质结湿度传感器不同湿度环境的电容响应,分析了它的工作机制.测试结果表明：传感器具有相对较大的灵敏度,较短的响应时间,较好的重复性、湿滞特性和稳定性,从而说明ZnO/SiNWs异质结在湿敏领域有很好的应用前景.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

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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