Anodic aluminum oxide film

V. ELECTROPHYSICAL PROPERTIES OF ANODIC ALUMINUM OXIDE FILMS... 

Itaya, K., S. Sugawara, K. Arai and S. Saito. 1984. Properties of porous anodic aluminum oxide films as membranes. J. Cheim. Eng. Japan 17(5) 514-20. 

Fig. 10.1.2 SEM photographs of the anodic aluminum oxide Film with 30 nm channels (a) surface and (b) cross section. (From Ref. 12.)...

A variety of nanomaterials have been synthesized by many researchers using anodic aluminum oxide film as either a template or a host material e.g., magnetic recording media (13,14), optical devices (15-18), metal nanohole arrays (19), and nanotubes or nanofibers of polymer, metal and metal oxide (20-24). No one, however, had tried to use anodic aluminum oxide film to produce carbon nanotubes before Kyotani et al. (9,12), Parthasarathy et al. (10) and Che et al. (25) prepared carbon tubes by either the pyrolytic carbon deposition on the film or the carbonization of organic polymer in the pore of the film. The following section describes the details of the template method for carbon nanotube production. 

In addition to the impregnation method with furfuryl alcohol, Kyotani et al. attempted to deposit pyrolytic carbon on the inside of the straight channels of anodic oxide film in the following way (9,12). They used two types of anodic aluminum oxide films with different channel diameters (30 and 230 nm). Each anodic oxide film... 

Anodic aluminum oxide film Carbon nanotubes... 

Kyotani, T., Tsai, L.F., and Tomita, A. Preparation of ultrafine carbon tubes in nanochannels of an anodic aluminum oxide film. Chem. Mater. 8, 1996 2109-2113. 

In these equations, A, , represents the exposed area of the specimen, p,. is the Him resistivity, e is the vacuum permittivity, and Eq/ is the relative permittivity of the metal oxide. Consistently, with such equations, the reciprocal capacitance of anodic aluminum oxide films increases on increasing the formation potential in both alkaline (Figure 6.15) and acidic media (Figure 6.14). This behavior reflects the increase in the film thickness on increasing the formation potential. 

Physical templates have also been used to facilitate the growth of PAn nanostructures. Nanofibril arrays were prepared by chemically depositing PAn into 20-200 nm pores in anodic aluminum oxide film (30-60 pm thick) that was subsequently etched away with 0.3 M H3P04or through ultrasonication.221... 

A self-aligning silver NP substrate was fabricated by Huang et al. (2011). A porous anodic aluminum oxide film was used for directing the silver NPs. Adenine was a test substance in SERS experiments and an enhancement of 10 was achieved. 

---