Preparation of tin oxide nanocoatings on borosilicate glass by the molecular layering method

The influence of the temperature on the preparation of tin oxide nanolayers on the surface of the C 52-1 borosilicate glass by the molecular layering method is investigated. Changes in the surface conductivity and the surface morphology of the glass modified by tin oxide nanolayers are analyzed as a function of the thickness of the coating and the synthesis temperature.     

High quality homoepitaxial CVD diamond for electronic devices

Recent achievements in homoepitaxial CVD diamond films for electronic devices have been discussed. We have successfully synthesized high-quality homoepitaxial diamond films with atomically flat surface by the microwave plasma chemical vapor deposition (CVD) using a low CH₄ concentration of CH₄/H₂ gas system less than 0.15% CH₄/H₂ ratio and Ib (001) substrates with low-misorientation angle less than 1.5°. These films are atomically flat over an area as large as 4×4 mm² and have shown a strong excitonic emission of 5.27 eV line, even at room temperature, with no essential emission lines in the visible light region in the cathodoluminescence (CL) spectra. Furthermore, high-quality Schottky junctions between Al and P type high-conductivity layers near the surface of these films have been obtained. Based on this growth method, we have also successfully synthesized B-doped diamond films using trimethylboron [B(CH₃)₃,TMB] gas as a B-doping source, whose Hall mobility is 1840 cm²/Vs at 290 K. Schottky junction fabricated by the B-doped diamond also shows excellent performances, indicating that the homoepitaxial diamond films presented here have a high potentiality for electronic devices.     

The influence of surface modifications of glass on glass fiber/polyester interphase properties

Unsized glass fibers and planar glass substrates were subjected to low temperature plasma or wet-chemical process to modify the fiber or substrate surface and thus influence the interphase properties of the glass/polyester system. Plasma-polymerized thin films (interlayers) of organosilicon monomers (hexamethyldisiloxane and vinyltriethoxysilane) were deposited in an RF helical coupling plasma system on the glass surface. Commercial silane coupling agent (vinyltriethoxysilane) was coated onto an unmodified glass surface from an aqueous solution. Bonding at the glass/interlayer interface was analyzed by employing a micro-scratch tester together with an optical polarizing microscope for the planar samples. The results revealed that the adhesion bonding could be controlled by plasma process parameters. Scanning electron and atomic force microscopies enabled characterization of the film surface morphology. Chemical composition and chemical structure of prepared interlayers were characterized using X-ray photoelectron and infrared spectroscopies. Microcomposites (macrocomposites) were tested to evaluate the interfacial shear strength (short-beam strength) of the glass fiber/polyester interphase using the microbond test (short-beam shear). Our study indicated that the most efficient interphase could be prepared by plasma polymerization or wet-chemical process using the vinyltriethoxysilane monomer. The short-beam strength was 110% higher than that for untreated fibers in both cases.     

Hydrothermal and electrochemical growth of complex oxide thin films for electronic devices

Thin film growth of complex oxides including BaTiO₃, SrTiO₃, BaZrO₃, SrZrO₃, KTaO₃, and KNbO₃ were studied by the hydrothermal and the hydrothermal–electrochemical methods. Hydrothermal–electrochemical growth of ATiO₃ (A = Ba, Sr) thin films was investigated at temperatures from 100 to 200 °C using a three-electrode cell. Current efficiency for the film growth was in the range from ca. 0.6 to 3.0%. Tracer experiments revealed that the ATiO₃ film grows at the film/substrate interface. Thin films of AZrO₃ (A = Ba, Sr) were also prepared on Zr metal substrates by the hydrothermal–electrochemical method. By applying a potential above ca. +2 V versus Ag/AgCl to the Zr substrates, AZrO₃ thin films were formed uniformly. Thin films of KTaO₃ and KNbO₃ were prepared on Ta metal substrates by the hydrothermal method. Perovskite-type KTaO₃ thin films were formed in 2.0 M KOH at 300 °C. Pyrochlore-type K₂Ta₂O₆ thin films were formed at lower temperatures and lower KOH concentrations.     

一窑双线平拉玻璃板面质量的改进

2001年3月,公司平拉生产线玻璃板面时常出现气泡、波筋、结石等缺陷.根据以往的经验和对具体情况的分析,认为这类缺陷产生的主要原因是配合料熔化不良所致,据此进行了深入的探索和全面的改进措施,取得了较为满意的效果.现将其改造过程作一介绍,供同行们参考.     

原料对玻璃质量影响的探讨

探讨了玻璃原料及其加工系统对浮法玻璃质量的影响 ,分析了几大影响因素 ,并作出相应的对比     

The influence of dissolved oxygen in solution on the titanium oxide growth at different sweep rates

The influence of dissolved oxygen on titanium oxide film growth at various sweep rates was explored for both pure titanium and a titanium alloy. The results showed that the dissolved oxygen becomes only significant when the sweep rate is sufficiently low, but which can be neglected in the case of enough high sweep rates. It reasonably assumes that there is no adequate time for oxygen to move to the anodic surface when the sweep rate is sufficiently high so that the role of oxygen becomes insignificant. However, the situation was found to be different when the anodic oxide film was growing at a sufficiently low sweep rate dynamically. This is because the reduction of dissolved oxygen in the solution occurs and produces an additional current, which opposes the oxide growth current produced by adsorption and subsequent charge reaction.     

钛材换热管热处理后表面氧化物的化学清洗

介绍了常温下去除钛材料换热管退火后氧化皮的酸洗过程与操作,定性讨论了酸洗液中各组分的性能、作用。     

浅谈电子玻璃布在织造中的质量控制

电子玻璃布(简称玻璃布)是覆铜板的主要原材料之一,随着电子技术的发展,对玻璃布的外观要求越来越高,玻璃布的细微疵点都可能会造成线路板的缺陷,所以提高玻璃布的质量是刻不容缓。     

Annealing temperature influence on sol-gel processed zirconium oxide thin films for electronic applications

A study of zirconium oxide (ZrO₂) thin films obtained by the non-alkoxide sol-gel method at different annealing temperatures, up to 450?°C, is presented. Morphological, compositional, and optical characterizations of zirconia thin films show high transparency and high bandgap, besides homogeneous and non-porous surface. Metal-insulating-metal (MIM) devices were assembled from this zirconia material for electrical characterizations and have shown high electric resistivity and high specific capacitance. A study of the thin film composition shows residues of S and Cl elements from the precursor solution that contributes for reduction of the dielectric constant of the zirconia thin films, even though they still present higher values when compared to SiO₂, which is a positive alternative to replace this oxide in electronic devices. A parallel study of MIM assembled on polymeric substrate and annealed at 100?°C also leads to positive results concerning high electrical insulating and capacitance. This study aims the understanding of the relations between annealing temperature and impurities found in sol-gel based thin films, as well as their relations to dielectric characteristics of zirconia thin films that impact the final properties of electronic devices, such as in field effect transistors.     

The evolution of graphene-based electronic devices

Successful isolation of single-layer graphene, the two-dimensional allotrope of carbon from graphite, has fuelled a lot of interest in exploring the feasibility of using it for fabrication of various electronic devices, particularly because of its exceptional electronic properties. Graphene is poised to save Moore's law by acting as a successor of silicon-based electronics. This article reviews the success story of this allotrope with a focus on the structure, properties and preparation of graphene as well as its various device applications.     

微发泡注塑制品表面质量的优化研究

以聚丙烯(PP)和高纯氮气为原料,采用高压短时和低压长时两种注气方式进行了微发泡注塑实验,并在以低压长时为注气方式的实验中,在不同熔体温度、注气压差和储料长度下,研究了冷却时间与制品表面出现大气泡概率之间的关系.结果表明,通过高压短时注气方式得到的制品表面出现大气泡的概率较高,严重影响制品质量;采用低压长时注气方式,制...     

Protection and retention of the quality of float glass surface

A method for active protection of the float glass surface from leaching based on spraying an aqueous phosphate solution on the surface of the moving glass band in the temperature interval of 120 – 560°C is considered. The coating provides for additional chemical modification of the glass surface and extends its storage period. Translated from Steklo i Keramika, No. 7, pp. 8–10, July, 1999.     

Phase constitution of the combustion products of thermite mixtures modified by titanium oxide

The products of frontal combustion of Fe₂O₃/TiO₂/Al thermite composite powder mixtures with various component ratios are studied. Differences in the composition of the combustion products are discussed. A probable mechanism of their formation is proposed. Practical uses of the results are considered. __________ Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 6, pp. 61–68, November–December, 2007.