Hard template fabrication nanowires

The utilization of soft templates is helpful for the construction of rare earth hydroxide nanotubes. The s)mthesis of Y(OH)3 nanotubes could be assisted by PEG (Tang et al., 2003) or grafted with PMMA (Li et al., 2004 Mo et al., 2005). Hard templates like A AO are also studied for the fabrication of rare earth hydroxide nanowires (Bocchetta et al., 2007). 

Other Ordered Mesoporous Silicas as Hard Template Other mesoporous silicas including MCM-41, HMS, MSU-1, MSU-H, SBA-1, SBA-7, SBA-12 and SBA-16 have also been explored as hard templates to fabricate mesoporous carbons. Mesoporous silica MCM-41, which has hexagonally ordered cylindrical one-dimensional pores, was found to be unsuitable as a template for mesoporous carbon as its use yielded disordered high surface area microporous carbon. This is due to the absence of complementary micropores within the MCM-41 silica walls. However, Tian et al. have successfully produced self-supported, ordered, ultrathin carbon nanowire arrays by employing the mesoporous silica MCM-41 as template.The carbon nanowire arrays exhibit high surface areas up to 1400 m g , large pore volumes of 1.1 cm g and uniform mesopore size of ca 2.2 nm. 

Among the several fabrication methods, hard template method, which was pioneered by Martin et al., has been the most famous route of nanotubes and nanowires. Nanotubes of conducting polymers could be readily prepared by filling the nanopores with polymer or polymer solution using AAO template or track-etched PC membrane. PPV nanotube and nanorod had been fabricated in the pores of alumina or PC filters with pore diameter 10-200 nm by... 

Template-assisted polymerization of condueting polymers has been an effective way to reproducibly fabricate conducting-polymer nanowires. Fundamentally, the technique employs a hard membrane template with pores of uniform length and diameter, typically composed of alumina. Polymerization can be performed chemically using a mixture of... 

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