聚正丁胺薄膜PH传感特性研究

将等离子体聚合的正丁胺薄膜直接淀积到玻璃态碳衬底上制成pH修饰电极。对其pH传感特性的研究表明聚正丁胺薄膜在浓H2SO4溶液中具有稳定的pH传感特性。敏感曲线在0．5～3mol／L间为线性响应．其斜率为66mV／pH。并对Na 、K 、SO42-等具有良好的抗干扰性。聚合条件对其pH传感特性有一定影响，低放电功率下制备的聚合膜响应敏感度较高，这归结于聚合膜中胺基含量较高的缘故；而高放电功率下制备的聚合膜具有较宽的响应范围，这归结于薄膜结构交联度较高的缘故。     

C2H2／H2／SiH4等离子体聚合及其沉积物的结构与性能的研究

利用Ｃ２Ｈ２／Ｈ２／ＳｉＨ４混合单体等离子体聚合沉积在ＨＤＰＥ板表面制备薄膜，发现薄膜与ＨＤＰＥ粘接良好，Ｈ２使薄膜与基体附着性能提高但其沉积速率下降，而引入ＳｉＨ４则使薄膜的耐磨性能有较大的提高。ＩＲ和ＸＰＳ光谱表明：薄膜中含有较多的－ＯＨ，Ｏ－Ｃ，Ｃ－Ｓｉ和Ｓｉ－Ｏ基团，随着ＳｉＨ４／Ｈ２的增加薄膜中的Ｃ／Ｓｉ比可达１．２２２，说明产物的结构介于无机材料和有机物之间。     

聚偏氟乙烯压电薄膜的应用及国内发展动态

聚偏氟乙烯压电薄膜的应用及国内发展动态吴琼近年来，在压电功能材料中，有机压电材料发展得很快，特别是聚偏氟乙烯（ＰＶＯＦ）压电薄膜发展得尤为迅速，投放市场后倍受青睐。ＰＶＤＦ压电薄膜是一种具有良好的压电性能的高分子聚合物，它是一种以－ＣＨ＿２－ＣＦ＿２...     

低压气相生长金刚石薄膜成核机理的研究

本文论述了低压气相生长金刚石薄膜中活性原子团ＣＨ＿３和原子态氢在金刚石成核运动中的作用以及衬底材料性能对成核的影响，认为活性基ＣＨ＿３是生长金刚石的主要活性物质，它们在衬底表面的吸附、碰撞、聚集等构成了成核运动，原子氢在成核运动中的主要作用是参与ＣＨ＿３的脱氢反应和石墨相碳原子团的刻蚀反应，并且还有稳定ＣＨ＿３中ＳＰ￣３杂化轨道的作用。衬底材料性能对成核的影响在于晶格失配而导致的错配位错和晶格畸变所引起的界面势垒和晶核弹性能的增加。最后讨论了金刚石薄膜与衬底之间是否存在过渡层问题，认为过渡层不是金刚石唯一的成核区，它的存在与生长条件密切相关，并且解释了关于过渡层实验研究中遇到的相互矛盾的结论。     

C-2CH复合型PTCR薄膜

采用溶胶包裹再凝胶工艺制备了Ｃ－２ＣＨ复合型ＰＴＣＲ薄膜。实验表明，这种材料的ＰＴＣ效应是由２ＣＨ的相变体膨胀引起的，Ｃ的粒径大小对复合薄膜ＰＴＣ特性有十分显著的影响。较高的热循环温度和较多的热循环老化次数使ＰＴＣＲ薄膜电性能重现性得以改善。     

C-H体系CVD金刚石薄膜

化学气相淀积金刚石薄膜过程中,ＣＨ３和Ｃ２Ｈ２是金刚石生长的主要前驱基团。Ｃ２Ｈ２与ＣＨ３浓度比（［Ｃ２Ｈ２］／［ＣＨ３］）的变化将影响金刚石薄膜的生长取向。用非平衡热力学耦合模型设计了Ｃ－Ｈ体系ＣＶＤ金刚石薄膜生长过程中Ｃ２Ｈ２浓度和ＣＨ３浓度随淀积条件的变化,并进一步获得了［Ｃ２Ｈ２］／［ＣＨ３］随衬底温度和ＣＨ４浓度的变化关系,从理论上探讨了金刚石薄膜（１１１）面和（１００）面取向生长与淀积     

二乙胺聚合膜特性研究

用等离子体方法将二乙胺单体聚合成聚二乙胺薄膜。红外光谱分析表明聚合膜中有 C- H,C- N及 N- H键存在。实验表明聚合膜性能同聚合工艺条件特别是射频放电电压有关。放电电压增加 ,热稳定性增加。聚合膜中碳含量增加而氢含量减少。在放电电压较低条件下聚合物具有长程无序态结构。而放电电压增大 ,等离子体中受激碳原子从电场中获得较多能量 ,在交联过程中能够调整其在网络结构中的位置 ,因而无序程序降低 ,有序态增加 ,甚至出现晶化现象。     

750℃下用低压化学汽相沉积在Si上外延生长单晶SiC薄膜

在（１００）硅单晶衬底上，７５０℃外延生长了立方晶系（１００）晶向的ＳｉＣ薄膜，该生长温度是目前所报道的最低生长温度。采用一种简单的硅碳比为１：１的甲基硅烷（ＳｉＣＨ３Ｈ３）源材料和Ｈ２，用低压化学汽相沉积工艺生长了ＳｉＣ薄膜。用透射电子显微镜（ＴＥＭ）、单晶和双晶ｘ射线衍射仪、红外吸收、椭球仪、厚度测量、四探针测量以及其它方法表征了生长的薄膜。ｘ射线测量结果表明，我们生长的薄膜结晶学质量与类似厚度的商用ＳｉＣ薄膜的质量相当。介绍了本研究中所用的新的生长装置和ＳｉＣ薄膜的性质。     

[Si(Pc)O]n晶体在NaCl单晶衬底上的外延生长

电子衍射实验表明，当单体酞菁硅二醇Ｓｉ（Ｐｃ）（ＯＨ）２在ＮａＣｌ单晶（１００）解理面上气相沉积时，所得聚酞菁硅氧烷（Ｓｉ（Ｐｃ）Ｏ）ｎ薄膜晶体中的分子链轴相对于膜面的取向，随衬底温度的升高而发生有规律的变化，不确定（１５０℃）→平行→平等＋垂直→垂直（≥３５０℃）高分辨电子显微像显示，与其在固态聚合时的情形不同，气相沉只时所得的（Ｓｉ（Ｐｃ）Ｏ）ｎ微晶主要属于四方晶系，只有少量属于带心的正交晶系     

射频反应溅射GexC1—x薄膜的特性

通过在Ａｒ＋Ｃｈ４气体中的射频反应溅射法制备出ＧｅｘＣ１－ｘｄ薄膜。利用俄歇电子能谱，Ｘ射线衍射，光度计及硬度测定等研究了沉积薄膜的成分，结构和性能。结果表明，薄膜中的Ｇｅ／Ｃ原子比随气体流量比ＣＨ４／（Ａｒ＋ＣＨ４）的增加而下降。     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

High-quality single-crystal CdSe nanoribbons and their optical properties

Large-scale synthesis of single-crystal CdSe nanoribbons is achieved by a modified thermal evaporation method, in which two-step-thermal-evaporation is used to control CdSe sources＇ evaporation. The synthesized CdSe nanoribbons are usually several micrometers in width, 50 nm in thickness, and tens to several hundred micrometers in length. Studies have shown that high-quality CdSe nanoribbons with regular shapes can be obtained by this method. Room-temperature photolumines-cence indicates that the lasing emission at 710 nm has been observed under optical pumping （266 nm） at power densities of 25-153 kW/cm^2. The full width half maximum （FWHM） of the lasing mode is 0.67 nm     

Propagation of hermite-cosh-gaussian beams passing through ABCD optical system with an annular aperture

By using the expansion of the aperture function into a finte sum of complex Gaussian functions, the corresponding analytical expressions of Hermite-cosh-Gaussian beams passing through annular apertured paraxially and symmetrically optical systems written in terms of ABCD matrix were derived, and they could reduce to the cases with squared aperture. In a similar way, the corresponding analytical expressions of cosh-Gaussian beams through annular apertured ABCD matrix were also given. The method could save more calculation time than that by using the diffraction integral formula directly.     

Influence of polarization extinction ratio on distributed polarization coupling detection

Distributed polarization coupling in polarization-maintaining fibers can be detected by using a white light Michelson interferometer. This technique usually requires that only one polarization mode is excited. However, in practical measurement, the injection polarization direction could not be exactly aligned to one of the principal axes of the PMF, so the influence of the polarization extinction ratio should be considered. Based on the polarization coupling theory, the influence of the incident polarization extinction on the measurement result is evaluated and analyzed, and a method for distributed polarization coupling detection is developed when both two orthogonal eigenmodes are excited.     

Call for Papers

正Communications—VLSI Researches and industries of telecommunications have been growing rapidly in the last 20 years and will keep their high growing pace in the next decade.The involved researches and developments cover mobile communications,highway and last-mile broadband communication,domain specific communications,and emerging D2D M2M communications.Radio communication steps into its