Carbon nanotube array VACNT is a new type of nanomaterial. Carbon nanotubes (CNT) are like grass. They form dense grass, that is, carbon nanotube array VACNT.
Different preparation methods of carbon nanotube array VACNT will make the interaction between single CNT and different CNTs in CNT macroscopic bodies different, which will have a great impact on subsequent processing and application. Generally speaking, CNTs grown on disordered catalysts show a certain agglomeration structure, severe entanglement, and disordered arrangement, making subsequent dispersion and other processing difficult. Under certain conditions, CNTs can be oriented significantly and arranged in parallel, that is, forming a CNT array. The excellent performance of carbon nanotubes depends to a large extent on the mechanical, optical, and electrical properties in the c-axis direction brought about by their huge aspect ratio. In the carbon nanotube array, carbon nanotubes are arranged in parallel, and their good orientation leads to low entanglement and easy dispersion, so that they can better play the various characteristics caused by their huge aspect ratio. For example, the native array can be directly used as field emission devices, anisotropic conductive materials, nano brushes, sensors and many other functional materials; some arrays can be drawn into wires and films to obtain CNT fibers or films with extremely excellent performance; even if the CNT arrangement in the array is destroyed, it can be applied to the fields of electrical conductivity, thermal conductivity and reinforced composite materials after being dispersed, and it still has better performance than agglomerated CNTs; in addition, the progress of CNT arrays in the application of super-strong, super-tough, and thermally conductive materials has potential and great engineering significance.
After obtaining a certain scale of arrays, people have carried out a lot of pioneering work on the application of carbon nanotube arrays. Because the carbon nanotubes in the array have good orientation, long aspect ratio, and three-dimensional regular arrangement structure, they can be directly processed into many functional devices. Some arrays are spinnable, and carbon nanotube films and carbon nanotube filaments with excellent performance can be obtained. Even if the array is dispersed, if it can still maintain a large aspect ratio, it also has great advantages in application. For the wide application and industrialization of a material, especially the excellent performance of carbon nanotube arrays in composite materials, there is a great demand for low-cost and mass production of carbon nanotube arrays.
The initial preparation method of carbon nanotube arrays is to use certain post-processing methods, such as polymer slicing and stretching; electric field, magnetic field, chemical bonding to assist orientation; gas or liquid flow shearing to orient disordered carbon nanotubes. Compared with the orientation of carbon nanotubes controlled by growth, these post-processing methods are usually complicated and difficult to prepare in large quantities and on a large scale. In addition, other media are often introduced to assist, making it difficult to obtain carbon nanotube arrays with extremely high purity. Therefore, obtaining carbon nanotube arrays by direct growth has become the mainstream method for preparing carbon nanotube arrays. The preparation methods of carbon nanotubes can be divided into three major methods, including graphite arc method, laser evaporation method and chemical vapor deposition method. Among them, chemical vapor deposition method has become the mainstream due to its many advantages in mild reaction conditions, low cost and good controllability.
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