氧化铝模板中Ag纳米线阵列的选择性生长

利用Ag离子与Br离子之间的化学沉积作用在孔隙中充满明胶的阳极氧化铝（AAO）模板中制备了AgBr/AAO纳米介孔复合材料.材料选择性曝光后,利用原位显影液对其进行化学显影,在AAO模板中选择性得到Ag纳米线阵列.实验结果表明：Ag纳米线是连续的、致密的,且具有多晶结构,充满了曝光部分的模板孔隙.本文还对影响Ag纳米线选择性生长的因素进行了简单讨论.     

AAO模板的制备及其应用

以多孔阳极氧化铝膜为模板制备纳米结构材料具有独特的优越性,得到了广泛的关注。本文介绍了在草酸溶液中制备的AAO模板的工艺过程,并用扫描电子显微镜（SEM）对阳极氧化铝膜的形貌和结构进行了表征,最后介绍了AAO组装体系的应用。     

模板法组装Ag纳米线阵列及其微结构

以多孔阳极氧化铝(AAO)作为模板,利用直流电沉积法,在AAO模板孔洞中成功组装了Ag纳米线阵列。扫描电子显微镜(SEM)分析表明,Ag纳米线的长度分布十分均匀,其长度随着沉积时间的延长而线性增长,生长速度约为5μm/h。透射电子显微镜(TEM)表明,Ag纳米线粗细均匀,直径约为200 nm。选区电子衍射(SAED)分析表明,所得Ag纳米线具有多晶结构。     

沉积温度和时间对多孔SiC薄膜的光致发光性能的影响

为了增强碳化硅(SiC)的光致发光性能,设计了三层结构的多孔SiC薄膜,衬底是单晶硅,中间层是双通阳极氧化铝(AAO)模板,顶层是SiC薄膜。采用磁控溅射工艺在AAO模板上沉积SiC薄膜,沉积温度为100~500 ℃,溅射时间为1~30 min。研究了沉积温度和沉积时间对SiC的光致发光性能的影响。结果表明:SiC薄膜为非晶态,SiC主要沉积在AAO模板的上层骨架结构上;与未经过溅射的样品相比,当衬底温度为200 ℃,溅射时间为1 min时, SiC的荧光性能增强至14.23倍;多孔SiC薄膜的荧光主要来自2.3 eV的主峰和2.8 eV的次主峰,主峰可能来自Al₂O₃的O缺陷发光与SiC本征发光,次主峰可能来自SiO₂的O缺陷发光。磁控溅射结合双通AAO模板法可应用于多孔荧光SiC薄膜的工业化快速制备。     

纳米氧化铝模板(AAO)的制备

多孔性阳极氧化铝(AAO)模板具有制备容易、成本低、孔道分布均匀等特点,是制备纳米材料的理想无机模板,近几年颇受人们的关注,获得了深入的研究。本文介绍了在草酸和磷酸溶液中,制备纳米氧化铝模板的阳极氧化工艺以及不同的电解液对模板特性的影响,并用扫描电子显微镜(SEM)对阳极氧化铝膜的形貌和结构进行了表征。     

高度有序多孔氧化铝模板影响因素的研究

在酸性电解液中,用阳极氧化法制备得到了多孔阳极氧化铝(anodic aluminum oxide,AAO)模板。用金相显微镜观察了铝箔退火后表面上的晶界,并结合扫描电镜对多孔氧化铝薄膜进行了观察和表征。研究了影响多孔氧化铝模板孔洞有序性的关键性因素。实验结果表明,多孔阳极氧化铝膜的有序度依赖于铝箔预处理、氧化电压和电解液等的选择。     

AAO模板制备条件的研究

为了得到高度有序的多孔阳极氧化铝(anodic aluminum oxide,AAO)模板,本文分别研究氧化电压、氧化温度、电解液种类、电解液浓度等影响因素对阳极氧化铝模板形成的影响,利用扫描电镜( SEM)观察不同条件下氧化铝膜的微观结构,从而得出了阳极氧化铝模板的最佳制备工艺范围:温度0～20℃,氧化电压35～50...     

硅基AAO模板法制备纳米阵列研究进展

硅基纳米材料结构与性能独特,在光学、半导体和材料科学等领域具有广阔的应用前景。本文介绍了硅基阳极氧化铝模板相对于铝基模板在集成纳米功能器件方面的优势及其制备方法,对阳极氧化工艺过程进行了分析,并对几种基于硅基AAO模板组装的纳米阵列进行了综述,总结了硅基纳米结构阵列性能的研究概况。     

模板浸润法制备非极性聚合物纳米管和纳米线

以孔径为200 nm的多孔阳极氧化铝(AAO)为模板,采用聚合物溶液或熔体浸润模板的物理方法,以非极性通用聚合物为原料,首次制备了非极性聚合物纳米管、纳米线及其阵列结构。对纳米管和纳米线的形貌和结构进行了表征,结果表明对非极性聚合物而言,温度是影响一维纳米结构的主要因素,在较低温度下只能制得纳米线;较高温度下才能得到纳米管。还指出AAO膜纳米孔的高表面效应与熔体的作用能是形成聚合物一维纳米结构的主要驱动力。     

Y型孔洞阳极氧化铝模板的制备研究

阳极氧化铝(AAO)模板由于制备简单,成本较低,其孔径大小具有可控性等优点,是制备形状均匀、有序纳米电子材料的理想无机模板。直流恒压下,在0.3 M草酸溶液中对铝实施两步阳极氧化,并在第二次阳极氧化中途降低电压为初始电压的1/2获得Y形孔洞的氧化铝模板。利用扫描电子显微镜(SEM)对模板进行表征,结果表明:氧化铝模板高度有序,主干孔径约90 nm,分支孔径为(42±5)nm。     

阳极氧化法制备大面积双面多孔氧化铝膜及其应用

室温下,以纯铝箔为基材,采用二步阳极氧化法,在0.3 mol/L草酸溶液中制备了大面积的双面氧化铝膜.在氧化过程中,电流呈现降低、升高、平稳、再降低的变化,最后接近于零.X射线衍射结果显示,双面氧化铝膜为无定型结构.扫描电镜结果显示:每面氧化铝膜的总厚度约为50 μm,孔径分布为50～100 nm.利用制得的双面氧化铝...     

Assembly of one-dimensional polymer nanostructure arrays by photolithographic approaches

In this work, large area polymer nanostructure arrays with different patterns were successfully obtained by photolithographic approach and wetting anodic aluminum oxide (AAO) templates. First of all, the AAO templates with patterns were produced by photolithographic approach. Then the AAO/pattern membrane was used as a secondary template to fabricate polymer nanostructure arrays by solution-wetting and melt-wetting methods. The morphology of the polymer nanostructures has been characterized using scanning electron microscopy and transmission electron microscopy. The different factors have been discussed in the process of experiments.     

多孔阳极氧化铝模板制备工艺的研究

以硫酸溶液为电解液,采用二次阳极氧化工艺制备高度有序的多孔阳极氧化铝模板.研究了电解液浓度、阳极氧化电压和阳极氧化温度对多孔阳极氧化铝模板形貌、孔径和孔间距的影响,并以高氯酸和丙酮的混合溶液为电解液,利用第三次阳极氧化,一步实现了多孔阳极氧化铝膜的通孔剥离,获得具有较大面积、韧性较好的通孔多孔阳极氧化铝模板.     

高度有序多孔阳极氧化铝制备工艺的研究

影响多孔阳极氧化铝(porous anodica lumina,PAA)形貌及结构等的因素有很多,如抛光铝片的表面粗糙度、电解液温度、氧化电压、氧化时间、搅拌速率等。本文采用二次阳极氧化法,以草酸为电解液,研究了高度有序AAO模板制备过程的主要工艺条件,并采用扫描电子显微镜对模板的形貌进行表征。结果表明,在电解液温度为12℃,氧化电压为40V能够得到高度有序的、孔径为80nm左右的多孔阳极氧化铝膜。     

Effects of anodization and electrodeposition conditions on the growth of copper and cobalt nanostructures in aluminum oxide films

Anodic aluminum oxide (AAO) films were prepared by alternative current (ac) oxidation in sulfuric acid and phosphoric acid solution. The porous structure of the AAO templates was probed by ac electrodeposition of copper. AAO templates grown using an applied square waveform signal in cold sulfuric acid solution exhibit a greater pore density and a more homogeneous barrier layer. UV–vis–NIR reflectance spectra of the Cu/AAO assemblies exhibit a plasmon absorption peak centered at 580 nm, consistent with the formation of Cu nanostructures slightly larger than 10 nm in diameter. Spectroscopic data also indicate that there is little or no oxide layer surrounding the Cu nanostructures grown by ac electrodeposition. The effect of pH of the cobalt plating solution on the magnetic properties of the Co/AAO assemblies was also investigated. Co nanowire arrays electrodeposited at pH 5.5 in H₂SO₄-grown AAO templates exhibit a fair coercivity of 1325 Oe, a magnetization squarness of about 72%, and a significant effective anisotropy. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.     

Magnetization reversal of Co/Pd multilayers on nanoporous templates

By making use of an e-beam deposition system, the [Co(2 Å)/Pd(10 Å)]₁₅ multilayers were prepared on a Si(100) substrate and anodized aluminum oxide [AAO] templates with average pore diameters of around 185, 95, and 40 nm. The mechanism of magnetization reversal of the Co/Pd multilayers was investigated. Wall motion was observed on the Co/Pd multilayers grown on the Si substrate. A combination of wall motion and domain rotation was found in the sample grown on the AAO template with a 185-nm pore diameter. For the samples grown on the AAO templates with pore diameters of around 95 and 40 nm, the reversal mechanism was dominated by domain rotation. The rotational reversal was mainly contributed from the underlying nanoporous AAO templates that provided an additional pinning effect.PACS: 75.30.Gw, magnetic anisotropy; 78.67.Rb, nanoporous materials; 75.60.Jk, magnetization reversal mechanisms.     

Fabrication of cobalt-nickel binary nanowires in a highly ordered alumina template via AC electrodeposition

Cobalt-nickel (Co-Ni) binary alloy nanowires of different compositions were co-deposited in the nanopores of highly ordered anodic aluminum oxide (AAO) templates from a single sulfate bath using alternating current (AC) electrodeposition. AC electrodeposition was accomplished without modifying or removing the barrier layer. Field emission scanning electron microscope was used to study the morphology of templates and alloy nanowires. Energy-dispersive X-ray analysis confirmed the deposition of Co-Ni alloy nanowires in the AAO templates. Average diameter of the alloy nanowires was approximately 40 nm which is equal to the diameter of nanopore. X-ray diffraction analysis showed that the alloy nanowires consisted of both hexagonal close-packed and face-centered cubic phases. Magnetic measurements showed that the easy x-axis of magnetization is parallel to the nanowires with coercivity of approximately 706 Oe. AC electrodeposition is very simple, fast, and is useful for the homogenous deposition of various secondary nanostuctured materials into the nanopores of AAO.     

Enhanced antibacterial activity of anodic aluminum oxide membranes embedded with nano-silver-titanium dioxide

In this work, the fabrication conditions of anodic aluminum oxide (AAO) templates with different pore size diameters were achieved using oxalic, tartaric, and phosphoric acidic electrolytes. Silver (Ag) nanostructures (NSs) were embedded in AAO template by simple hydrothermal and photoreduction methods. Moreover, titanium dioxide (TiO₂) NSs (nanowires) was deposited into these porous templates by sol-gel method. FESEM results suggested that Ag nanofishstars, nanonecklaces (NNs), and TiO₂ nanowires (NWs) like structures were grown in AAO pores with high-order and -aspect ratios. An anti-adhesive method was used to estimate the nano-size effect of the structures for enhancing antibacterial mechanism against Pseudomonas aeruginosa Gram-negative bacterium, and Staphylococcus aureus Gram-positive bacterium. In this study, the inhibition percentages of the Ag NNs/AAO membrane were 86.4, and 77.4%, respectively whereas that of the Ag film on glass substrate were 65, and 53.9%. Moreover, the inhibition percentages of the TiO₂ NWs/AAO membrane were 85.9, and 70.1%, on the other hand, the TiO₂ film on glass substrate were 60.3, and 45.2%. Results proved that the high porosity of the AAO template improved the contact-killing and release-killing actions of nanoparticles against biofilms.     

CdS纳米管合成方法研究进展

作为一种典型的光电半导体材料,硫化镉(CdS)一维纳米材料的合成近年来受到人们的广泛关注.本文综述了阳极氧化铝(AAO)、聚四氟乙烯(PTFE)硬模板,聚乙烯醇(PVA)软模板和超声化学法合成一维CdS纳米管,介绍了各种合成方法中CdS纳米管的形成机制.