CVD of nanowires and nanotubes, mass production, and industrialization
This chapter provides an overview on heterostructures and superlattices consisting of various types of one-dimensional (1D) nanomaterials produced by chemical vapour deposition (CVD)-based methods, including carbon nanotubes, silicon/ germanium nanowires, III–V, II–VI, and metal nanowires. In 1880, CVD process was developed to deposit carbon for the fabrication of carbon fibres. The selection of CVD method depends on many factors covering 1D nanomaterial, chemical precursor, substrate material, and the desired growth orientation. Thermal CVD methods include the use of process with and without catalysts. The complex structure of 1D nanomaterials, such as nanowire heterostructure devices, could take advantage of the strain relaxation in nanowires to produce the device components that would not be possible in bulk. Considerable effort has been made to fabricate 1D nanomaterials of different compositions and morphologies. Carbon nanotubes have also been utilized to prepare metal-based composites, in which carbon nanotubes increase tensile strength and modulus.