Carbon nanotubes, template-synthesized

Various nanoporous AAO membranes have been obtained by varying different parameters such as applied voltage, temperature of electrolyte, electrolytic concentration and speed of rotation of electrolyte in two step anodization process. SEM analysis performed for evaluation of results. The relationship between pore size and variation of different parameters obtained. The synthesized membranes have been used as template for the synthesis of carbon nanotubes of different nano dimensions. 

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. 

Potential Application of Template-Synthesized Carbon Nanotubes... 

FIGURE 24.1 Scanning electron micrograph of an array of template-synthesized carbon nanotubes. These nanotubes are composed of disordered graphitic carbon. (From Miller, S.A., Young, V.Y., and Martin, C.R., J. Am. Chem. Soc., 123, 12335, 2001. With permission.)... 

Nanotubes of oxides of several transition metals, as well as of other metals, have been synthesized by employing different methodologies [24, 216-220]. Silica nanotubes were first produced as a spin-off product during the synthesis of spherical silica particles by the hydrolysis of tetraethylorthosilicate (TEOS) in a mixture of water, ammonia, ethanol and D,L-tartaric acid [216]. Since self-assembly reactions are not straightforward with respect to the desired product, particularly its morphology, templated reactions have been employed using carbon nanotubes to... 

Ordered mesoporous carbon can also be synthesized by a catalytic CVD method.[251] The ordered carbons possess bimodal pores the pores arise from the replica frameworks of the template and the pores correspond to carbon nanotubes formed in the channels of the template. 

Figure 9.20 Powder X-ray diffraction patterns of AlPO4-5 (Cu-Ka radiation, X— 1.5418 A), (a) as-Synthesized template-containing sample (b) pyrolysed sample containing carbon nanotubes (c) completely detemplated sample. The inset shows the variation of the (001) reflection position.

Single crystalline (3-Ag2Se nanorods have been synthesized using carbon nanotubes as templates (12). First, Ag/C nanocables are synthesized from AgNOs, K2CO3, and NH2SO3H under hydrothermal conditions. The Ag/C nanocables are first dispersed... 

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