Li-N-H共掺法制备 p型 ZnO薄膜

采用Li-N-H共掺技术在玻璃衬底上生长p型ZnO薄膜．XRD结果表明共掺ZnO薄膜具有高度c轴取向,Hall测试表明薄膜的电阻率为25．2Ω·cm,Hall迁移率为0．5cm~2/(V·s),空穴浓度为4．92×10~(17)/cm~3．此外,p-ZnO薄膜在可见光区域具有90%的高透射率．     

铝氮共掺制备p型ZnO薄膜的电学性能研究

本文通过直流反应磁控溅射,采用Al N共掺的方法在N2O-O2气氛下制备p型ZnO薄膜.结果表明,衬底温度为500 ℃时共掺所得p型ZnO的载流子浓度最高,并且比单独掺氮时高近3个数量级.本文还讨论了生长气氛对薄膜电学性能的影响,当衬底温度为500 ℃时,在纯N2O气氛下制备的p型ZnO的空穴浓度最高,为7.56×1017 cm-3,同时薄膜的电阻率和载流子的迁移率分别为94.3 Ω*cm和0.09 cm2V-1s-1.     

SiO2/Si衬底制备ZnO薄膜及表征

本文报道了利用脉冲激光沉积技术在热氧化p型硅衬底上生长ZnO外延薄膜.引入高阻非晶SiO2缓冲层,有效地降低了检测过程中单晶衬底对ZnO薄膜的电学性能影响.利用XRD,SEM,Hall和PL对其进行研究.结果表明,在衬底温度为500℃时,生长的ZnO薄膜具有优良的晶体质量,电学性能和发光性能.     

Al、N共掺杂实现ZnO的p型转变及其掺杂机理探讨

利用直流反应磁控溅射以Al、N共掺杂的方法生长p-ZnO薄膜.ZnO薄膜沉积于具有不同衬底温度的玻璃或Si衬底上,N来自NH3与O2的生长气氛,Al来源于AlxZn1-x(x=0.08%)靶材.利用XRD、XPS、Hall测试对其性能进行了分析.结果表明,用Al、N共掺杂的方法可以得到c轴择优取向的p型ZnO薄膜,载流子浓度为(1014～1015) cm-3,电阻率为(1.54～3.43)×103 Ω·cm,迁移率为(1.16～4.61) cm2/V·s.由Al、N共掺杂和仅掺N的两种情况下ZnO薄膜的N1s的XPS图谱可以推断出,N的掺入可能是以Al-N键的形式存在,而且Al的存在促进了N原子作为受主的掺入.     

掺杂ZnO薄膜研究

采用电子束蒸发方法在玻璃衬底上制备ZnO薄膜和掺杂ZnO薄膜.通过X射线衍射、台阶仪及Hall效应等测试研究了衬底温度和掺杂对晶体质量和电学性能的影响,发现原位生长的ZnO薄沿c轴择优生长,且掺杂ZnO薄膜具有低达3.029×10-4Ω·cm的电阻率.     

喷雾热解法生长N掺杂ZnO薄膜机理分析

通过超声喷雾热解工艺,以醋酸锌和醋酸铵的混合水溶液为前驱溶液,在单晶Si(100) 衬底上制备了N掺杂ZnO薄膜,采用热质联用分析(TG—DSC—MS)、X射线衍射(XRD)、场发射扫描电镜(FESEM)和霍耳效应(Hall-effect)测试等手段研究了喷雾热解工艺下N掺杂ZnO薄膜的生长机理、晶体结构和电学性能.结果表明,随衬底温度的不同,薄膜呈现出不同的生长机理,从而影响薄膜的晶体结构和电学性能.在优化的衬底温度下,实现了ZnO薄膜的p型掺杂,得到的p型ZnO薄膜具有优异的电学性能,载流子浓度为3.21×10¹⁸cm^-3,霍耳迁移率为110cm²·V^-1s^-1,电阻率为1.76×10^-2Ω·cm.     

离子注入法制备N掺杂p型ZnO薄膜

采用离子注入技术对射频磁控溅射制备的ZnO薄膜进行N掺杂,通过退火实现了ZnO薄膜的p型转变.利用X射线衍射(XRD)和Hall实验对样品热退火前后的性能进行了研究.实验数据表明,该掺杂方法能得到稳定的p型ZnO薄膜,其电学性能随热退火温度的升高和时间的延长而进一步改善,其中在950℃、7min退火条件时,载流子浓度为1.68E 16cm-3,电阻率为41.5Ω·cm.     

化学溶液沉积法制备的Bi_4Ti_3O_(12)铁电薄膜的电学性能研究

采用化学溶液沉积工艺在电阻率为 6～ 9Ω·cm的n -Si(10 0 )衬底上生长Bi4Ti3O1 2 铁电多晶膜 ,研究了薄膜的电学性能 ,结果表明在 6 50℃下退火 1h得到的Bi4Ti3O1 2 薄膜具有良好的介电和铁电性能 ,其介电常数ε =12 9,剩余极化Pr=5.1μC/cm2 ,矫顽电场Ec=96kV/cm。     

Na掺杂含量对ZnO:Na_x薄膜结构和光电性能的影响

利用激光脉冲沉积法(PLD)制备了Na掺杂ZnO∶Nax薄膜(0≤x≤0.1),并较全面地研究了Na含量对ZnO∶Nax薄膜结晶质量和光电性能的影响。研究结果表明Na含量低于5%时,ZnO∶Nax薄膜能够保持良好的c轴择优取向生长。随着Na含量的增加,薄膜由本征n型转变为p型。并且当Na含量为2%时,获得p型性能良好的薄膜:电阻率为53.5Ωcm,迁移率为0.55cm2V-1s-1,空穴浓度为2.1×1017cm-3。结合XPS测试结果,我们认为p型转变是因为Na掺杂在ZnO中主要形成受主态NaZn。PL测试表明ZnO∶Na0.0 2薄膜在377nm处具有良好的室温紫外带边发射。     

Al、N共掺Zn1-xMgxO薄膜的制备与性能研究

采用直流反应磁控溅射方法,由氨气和氧气的混合气体在玻璃和单晶硅衬底上制备Al、N共掺Zn1-xMgxO薄膜.采用XRD、FE-SEM、Hall实验、UV-VIS透射谱以及EDS等方法对共掺Zn1-xMgxO薄膜的结晶性能、电学和光学性能进行研究.结果表明薄膜有明显的C轴择优取向,玻璃衬底上制备的p-Zn0.9Mg0.1O薄膜的电阻率为8.28 Ω穋m,空穴浓度和迁移率分别为1.09×1019 cm-3和0.069 cm2/V穝.并且掺Mg的ZnO薄膜透射光谱表现出明显的蓝移.p-Zn0.9Mg0.1O/n-Si异质结的I-V特性曲线表现出明显的整流特性,可以确定制备的Al、N共掺Zn0.9Mg0.1O薄膜的导电类型是p型的.     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

Investigation of the Corrosion Behaviors of HVOF-Sprayed Carbide Cernet Coatings in Molten Al-Zn-Si Alloy Bath

In continuous hot-dip galvanization process the corrosion and chemical stability of the sink roll in the galvanizing bath are important problem which effects on the quality and productivity. In order to protect the sink roll the carbide cermet and/or ceramic coatings were deposited on the surface of the sink roll. The WC-, Cr3 C2-cermet coatings were deposited by high velocity oxygen fuel (HVOF) spray, respectively. The coating samples were immersed in molten Zn-alloy containing 50 wt % aluminum at 833 K for 24 hr and 144 hr, respectively. The inter-diffusion and inter-reaction of Zn, Al and elements in coating and corrosion behaviors of these coatings were investigated by XRD, SEM and EPMA etc. The corrosion mechanisms of the carbide cermet coatings and ceramic coatings in molten High Al-Zn-alloy were approached.     

Fundamental study of adhesion of ice to cooling solid surface (Discussion on influence of copper oxide layer on ice adhesion force)

In many situations, ice often adheres to a cooling solid surface, frequently causing serious accidents. It is critical to clarify the mechanism of ice adhesion to the cooling surface in order to prevent ice adhesion. In a past study, the shearing stresses of two kinds of test plates with a copper surface having the higher thermal conductivity were measured. The shearing stress corresponds to ice adhesion force. Both shearing stresses were significantly different; however, the cause remains unclear.Therefore, the present study focuses on an oxide layer as the main factor causing the difference of both shearing stresses; the influence of the oxide layer formed on shearing stress was discussed. And in the removal and reformation processes of the oxide layer, the time variation of the shearing stress was clarified. Moreover, the relationship between the state of the copper surface and the shearing stress was also clarified by surface analysis.     

重塑标准推行格局 推动LED照明的普及（英文）

正When you are enjoying the green,energy-saving and healthy lighting of IKEA LED luminaire,you may not realize that most of IKEA’s LED bulbs are produced by the LED luminaire smart manufacturing system of Hangzhou Zhongwei Photoelectricity CO.,LTD(ZVISION).No longer enclosed in the laboratory,the product standards are brought into the factory workshop and even to the entire production process.Thus,the standards are promoted and applied in a favorable way by enterprises,benefitting consumers with high quality products.     

Chinese Experts Contribute to ISO＇s New Toy Standards

正The international standard,ISO 8124-6,Safety of toys–Part 6:Certain phthalate esters in toys and children’s products,was officially issued by ISO worldwide on August 15.It was the first time for Chinese experts to lead the ISO standard development in toys industry.The standard was drafted by a group of Chinese experts from SAC/TC for toys and relevant Chinese departments and finally completed by a dedicated international group of experts.ISO 8124-6 makes a substantive breakthrough in the aspects of the scope of toys,limitation of plasticizer types,control of test cost,accuracy of test,operation convenience,etc.,offering the operational guidance for toy manufactures and testing laboratories.     

中国质量(北京)大会(英文)

正Themed on"quality,innovation,development",the first China Quality Conference(Beijing)was held in the Great Hall of the People on September 15.Chinese Premier Li Keqiang delivered an important speech at the conference.State Councilor Yang Jing and Wang Yong attended the conference with over 600 domestic and international representatives from foreign,regional and international quality organizations     

National Working Meeting on Land and Resources Standardization

正The National Working Meeting on Land and Resources Standardization was held in Beijing on July 15,2014.Wang Min,the Deputy-Minister of the Ministry of Land and Resources,and Yin Minghan,the Chief-Engineer of SAC addressed the meeting.Representatives from relevant competent departments and technical committees were present.The meeting aims to summarize work,discuss existing problems and make clear working thoughts,promoting standardization work of land and resources to a new level.Wang Min pointed out that the standardization work of land and resources should be centered on the basic principles of"protecting land and resources dutifully,intensively and economically utilizing land and resources,and making all-out efforts to safeguard the public’s rights and interests",highlighted the