多孔氧化铝模板法制备取向碳纳米管阵列的研究进展

利用化学气相沉积技术在多孔氧化铝模板上可以制备取向碳纳米管阵列。通过调节阳极氧化参数可以改变模板的孔结构,进而可控制碳纳米管在孔道中生长的形貌。用这种方法制备的碳纳米管的直径、长度和密度可以选择性控制,这将有利于研究碳纳米管的性质和它在电化学及其他领域的应用。介绍了多孔氧化铝模板的形成原理以及碳纳米管在多孔氧化铝模板上的生长机理,讨论了阳极氧化条件、催化剂和气相沉积温度对碳纳米管特性的影响,并指出了这种技术中一些需深入研究的问题。     

在柠檬酸中制备大孔径阳极氧化铝模板的方法

现有的报道普遍认为柠檬酸作为阳极氧化铝的反应溶液只能制备出致密型的氧化铝膜。笔者发现柠檬酸作为反应溶液在350V直流电压下可制备出孔径600nm左右的多孔型的阳极氧化铝模板(AAO)模板.通过与以往研究结果比较发现要想获得较大孔径的AAO模板需要选择较小电离常数的酸液.在去除阻挡层时,磷酸腐蚀了模板的反面,导致模板反面的孔径大约是正面孔径的一倍.     

AAO工艺+絮凝沉淀处理高COD废水

为解决某植物榨汁饮料厂的废水COD高、有异味等问题,研究了厌氧—缺氧—好氧(AAO)工艺和絮凝沉淀混合工艺对废水的处理效果。探索了初始浓度、曝气量、絮凝剂的种类和投加量等对废水处理效果的影响机制。实验结果表明,初始浓度为4000 mg/L的废水,经AAO工艺后COD去除率可达77%。继续投加合适的絮凝剂后废水COD去除率可达90%。处理后的废水澄清无异味,可进行后续处理排放。     

Pb(Zr0.52Ti0.48)O3 nanotubes synthesis and infrared absorption properties

Herein a useful methodology to synthesize the lead zirconate titanate (PZT) nanotubes via a dip-coating deposition process with anodic aluminum oxide (AAO) template is proposed. The nano-porous AAO templates were produced using a controlled two-step electrochemical anodization technique. The PZT/AAO composite was formed using the dip-coating wetting technique. The prepared PZT precursor solution was driven into the nanopore channels of AAO template under the driving force of capillary action, subsequently the sintering process of the as-filled templates was carefully tuned to obtain Pb(Zr_0.52Ti_0.48)O₃ nanotubes of crystalline tetragonal phase with uniform pore size and ordered arrange. Fourier transform infrared spectroscopy (FTIR) results show that in the 1200–1900 cm⁻¹ band, the composite structure of PZT/AAO has obvious absorption peaks at 1471.56 cm⁻¹ and 1556.09 cm⁻¹, the absorption intensity of the composite structure is about six times of pure AAO template. The unusual optical properties found in PZT/AAO composite will stimulate further theoretical and experimental interests in ferroelectric nanostructures.     

铜纳米线的合成及其催化性能

利用多孔氧化铝(AAO)模板经交流电沉积制备得到了铜纳米线阵列,扫描电子显微镜(SEM)、能谱仪(EDS)分析结果表明:其长度在1~2μm,直径在60~80nm之间。利用制备的铜纳米线催化生长了纳米碳纤维阵列(VACNFs),利用SEM对VACNFs的形貌进行了表征,结果表明,所制备的VACNFs呈现阵列状分布,每根纤维垂直基底直立生长,在纤维末端距离较近的纤维之间相互吸引缠绕形成纤维束。最后分析了纳米碳纤维阵列的生长机制并提出了生长模型。     

Characteristics of ACPDP test panels with aluminum fence electrode formed via anodic bonding with soda‐lime glass

Abstract— In an attempt to reduce materials and processing costs of ACPDPs, aluminum fence electrodes were prepared on soda‐lime glass substrates by chemically etching aluminum foil bonded directly onto the substrate via an anodic‐bonding process. Several different fence‐electrode patterns were designed and coated either with a glass dielectric layer or with an anodic aluminum oxide layer. Firing voltages, operation margin, luminance, and luminous efficiency of such test panels were evaluated. The results indicated that the performance of test panels with aluminum fence electrodes is comparable with conventional test panels with ITO/Ag electrodes, demonstrating the possibility of a dramatic reduction in the costs of ACPDPs.     

Research on the preparation of amorphous diamond nanorod arrays and their excellent field emitting properties

During recent years, with the rapid development of IT and micro-electrics, the ultra- thin, ultra-large display screen with low power consumption, has attracted more and more attention. As the core of devices, cathode materials are made much more demands in the vacuum microelectronic technology. So the materials with low power consumption, outstanding field emission properties and extreme stability are very important. To resolve the problem, many researchers have been making efforts. Diamonds…     

采用阳极氧化铝做掩膜生长氮化镓膜

采用均匀的多孔阳极氧化铝做掩膜在氢化物气相外延设备中生长出高质量的氮化镓膜.采用扫描电镜观察了氮化镓膜的界面性质并用阴极发光谱表征了截面上氮化镓层在不同位置的的发光性质,发现随着厚度的增加,其发光特性得到改善,而且由于掩膜结构的引入,外延膜中的压应力得到一定程度的释放.     

直流电沉积CdS纳米线的研究

在磷酸溶液中，采用二次铝阳极氧化法得到了多孔铝阳极氧化膜(AAO)．以AAO为模板，选用直流电沉积方法在孔内组装CdS半导体纳米线，溶去模板后，获得粗细均一、直径约为100nm、长度约为1．5μm的纳米线，与AAO模板的孔径一致．该方法在制备过程中，无需对AAO模板进行去除阻挡层、喷金或预镀金属等处理过程，而是直接在纳米孔内电沉积CdS，形成CdS半导体纳米线阵列．该方法工艺简单，操作方便，容易获得半导体CdS的一维纳米材料．TEM和XRD测试结果表明，CdS纳米线为六方晶型结构．对CdS纳米线的生长机理还进行了初步的分析和探讨．     

Fabrication of quasi-one dimension silicon carbide nanorods prepared by RF sputtering

Anodic aluminum oxide (AAO) template was prepared by a two-step anodization method at low temperature (1 °C) and silicon carbide was deposited on the templates by non-reactive radio frequency sputtering method. Well-aligned quasi-one dimension silicon carbide nanorods with the average diameter about 80-90 nm and a mean length of 400 nm were obtained perpendicular to the substrate and observed by AFM and SEM after the aluminum substrates were striped off. Then some samples were annealing at flowing N₂ at 400, 500 and 600 °C and FTIR was performed on these samples to obtain the information of structure.