Carbon nanotubes (CNTs) are graphite layers have hexagonal carbon rings rolled into cylinders which are discovered first in 1991 [1,2]. According to their unique properties of carbon nanotubes (CNTs) which coming from their atomic structure and size therefore CNTs take wide concerns in technology and science and wide range of application which CNTs entering in it such as electrodes, hydrogen storage and sensors [3,4]. CNTs have different structures and diameters which classified into three types such as: single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs) in addition to few wall carbon nanotubes (FWNTs) [5,6].
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