Preparation Of Oriented Carbon Nanotubes Composite And Its Terahertz Time - Domain Spectral Response Mechanism

Recent years, Terahertz technology is more and more widely to used in the researches and the applications, and the most important task is to developed the functional components in low cost, simple technology, and good performance. Carbon nanotubes (CNTs) present excellent anisotropic electrical, magnetic, optical properties due to their quasi one dimensional structure. Based on CNTs, we can fabricate some composite materials which with repeatability and multifunctionality. So this work will not only have an significant innovation for deeper understand the intrinsic properties of carbon nanomaterials in the terahertz range theoretically, but also have a fundamental support various modern applications in the electrical and optical industry.In this paper, Well-organized CNT-SiC hybrid structures and aligned carbon nanotube arrays were prepared by floating catalytic chemical vapor deposition (CCVD) process. The structure and morphology of the samples were detected by thermgravimwtric analysis (TGS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), etc. The results show that the size of the samples was micro-scale. Based on the CNT-SiC hybrid structures and taken the PVA, gelatin as the matrix, we fabricated four kinds of composite materials, MWCNTs/PVA, CNT-SiC/PVA, MWCNTs/ gelatin, CNT-SiC/gelatin. The composite materials were stretched to 2.5 times of the original length, and detected by the THz time-domain spectroscopy technology. The results indicated that the alignment of CNT-SiC hybrid structures in the gelatin polymer was the best, and the anisotropic properties of CNT-SiC/gelatin composite films were more excellent. Also we prepared the CNTs/gelatin and CNTs/Epon-812 composite materials by casting the gelatin solution, Epon-812 solution on the aligned carbon nanotube arrays. By analyzing the technologies, we concluded that gelatin can easily to be the films, but can’t penetrate into the carbon nanotube arrays. However, the permeability of Epon-812 is excellent, it can fully immersed in the carbon nanotube arrays and the structure of some biological tissue.