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Ultrathin AAO membranes

Ultrathin AAO templates have self-organized honeycomb-like nanopores, and they are usually from several ten nanometers to several hundred nanometers in thickness.Ultrathin AAO templates have been widely used for fabrication of large-scale ordered arrays of surface nanostructures such as nanodots and nanoholes on the surface of substrates. Pores of ultrathin AAO template are uniform in diameter and highly ordered in a short-range. In addition, the material (Al2O3) is transparent in the near-infrared and visible spectrum, and is electrically insulated. Compared to other technology for making ordered nanostructures, ultrathin AAO template has special advantages such as large pattern area (1 cm^2), high throughput, ultrahigh density (10^8–10&12 cm^2) of the surface nanostructures, and low equipment costs.Fig. 1. Up: Schmatic of our ultrathin AAO template product (or AAO membrane); bottom: a photo of large area PMMA/ultrathin AAO template film.Fig. 2. The product of ultrathin AAO templa...

2018 - 03 - 12
V shape AAO on substrate

A new type of AAO product (V-shape AAO) is developed by Topmembranes Technology. Compared to other anodic alumina membranes products, this profile of type of AAO is precisely tailored by the synergistic control of anodizing time, etching time and cyclic times, resulting in a unique structure for a wide range of applications.For more applications of V-shape AAO, please refer to: Adv. Mater. 2014, 26, 2805；ACS Nano, 2015, 9, 10287；Adv. Funct. Mater. 2017, 27, 1604720；Nanoscale Research Letters 2013, 8，268；J. Phys. Chem. C 2017, 121, 9757; Nano Energy, 2016, 22, 539; ACS Nano 2017, 11, 5113. Figure 1. Schematic of V-shape AAO product. Dint is the interpore distance，Dt is the diameter on the top surface and Db is the diameter at bottom. Figure 2. The SEM images of V shape AAO. (a)-(c) are different magnification of top view, and (d) is the cross section profile.V shape AAO template is a special AAO template with taper-nanopore or inverse-nanocone, which is similar with AAO...

2018 - 03 - 13
AAO on Al substrate

AAO on Al substrate has honeycomb-like structure (shown in Fig. 1), composed with hexagon column of Al2O3, with a circular pore in the center. At the end of the pore, there is a half-sphere shape barrier layer oxide layer in contact with aluminum. The porous oxide film contains mutually parallel cylindrical pores extending from the barrier oxide layer to the film surface. AAO on Al substrate is the simplest product in AAO family, which can be fabricated into large area with a high success rate. Fig. 2 shows a typical picture of the AAO template.Fig. 1. Schematic of AAO on Al substrate. Fig. 2. A large area AAO on Al substrate.The pore diameter can range from 10 nm to several hundred nanometers, and the depth (or thickness of AAO) can be controlled continuously from several ten nanometers, up to one hundred microns. The pores of AAO on Al substrate is short-range ordered over a large area, which can be used as a master to transfer porous structures into other materials. The high d...

2018 - 03 - 13
Isotropic AAO templates

Isotropic AAO templates, often referring to thicker AAO to be different from ultrathin AAO membrane, are widely used for a number of different fields. Topmembranes technology is specialized to make high quality isotropic AAO templates, with highly uniform and regular pore on both sides of the surfaces. The pores are arranged hexagonally within the single grains of the aluminum. The translucent nature of AAO is appealing to applications in biomedical field.Fig. 1. The structure diagram of isotropic AAO templates.Fig. 2. Typical SEM images of both sides of isotropic AAO template. Fig. 3. Typical SEM images of the cross section of isotropic AAO templates.Isotropic AAO templates are made from AAO on Al substrate. When the thickness is less than 1μm, they are called ultrathin AAO membrane, which often need other materials as supports. When the thickness reaches several tens micron, the structure can be self-supported, and has certain strength and elasticity, which can be used for ...

2018 - 03 - 13
Thinned barrier layer AAO

Using AAO as template, various one-dimensional nanomaterial arrays can be easily fabricated by electrochemical deposition. Generally, double-pass AAO templates are used. One layer of metal conductive layer is evaporated on the side of the template, and then nanomaterials are prepared by DC electrochemical deposition. However, double-pass AAO templates are fragile and inconvenient to operate. Evaporation of metal conductive layer also increases the cost and complexity of the experiment. If single-pass AAO templates can be used, the efficiency of the experiment will be greatly improved and the cost of preparation will reduce. However, in general, there is a thick barrier layer at the bottom of the single-pass AAO template hole. The layer of alumina insulation between the channel and the aluminium base is tens to hundreds of nanometers thick, which makes it difficult for electrons to pass through, even if AC electrochemical deposition is used, let alone DC electrochemical deposition.Figur...

2018 - 12 - 27
AAO on Si substrate

Fig. 1. In-situ fabrication of AAO templates on silicon wafers: (left) 2 inches, (right) 4 inches. The preparation of AAO template by using high purity aluminium sheet has the advantages of good uniformity and good operability. However, the AAO template prepared from high purity aluminium sheet is difficult to be compatible with semiconductor technology, and it is not easy to obtain more precise and controllable micro-structures and micro-devices. Moreover, the ultra-thin AAO template prepared by aluminium sheet is easy to form wrinkles when transferred to the substrate, and the adsorption force is not strong, and the local area is weak. There may be disengagement. In order to remedy the above shortcomings, in-situ growth of AAO on substrates has been rapidly developed in recent years. The basic principle is to evaporate aluminium on the substrate and then prepare AAO, which is called AAO on substrate.Figure 2. SEM diagram of AAO on Si substrate.A silicon AAO product is introduced...

2018 - 12 - 27
Polished Al

Polished Al Product descriptionPurity of the Al: 99.999%Thickness of the Al: 120~190μm

2018 - 12 - 27

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