Large-area freestanding carbon nanotube paper and preparation method thereof

Abstract

The invention provides large-area freestanding carbon nanotube paper and a preparation method thereof. The carbon nanotube paper is composed of disordered carbon nanotubes and in a non-woven fabric form. The preparation method comprises the steps of: dissolving carbon nanotube powder in a solvent, dispersing it uniformly and placing the dispersion solution in a pumping filtration device, conducting pumping filtration to deposit the carbon nanotube on filter paper, then separating the carbon nanotube paper and the filter paper, thus obtaining a target product with thickness ranging from micrometers to hundreds of micrometers. The method of the invention is not limited to a specific carbon nanotube kind, pumping filtration device and dispersion degree, and can be realized by ordinary filtering equipment and dispersion equipment. With an area more than 50cm<2>, the prepared carbon nanotube paper has the advantages of freestanding capability, low content and easy removal of a dispersing agent, controllable flexibility and poriness, simple operation technology, and low cost, thus being applicable extensively in the fields of new energy, heat radiation of high power electronics, advanced chemistry, chemical and biological separation, filtering membranes and high performance light polymer composite materials.

Description

technical field [0001] The invention particularly relates to a large-area self-supporting carbon nanotube paper and a preparation method thereof, belonging to the technical field of nanocarbon material preparation. Background technique [0002] Due to their excellent mechanical and mechanical properties, carbon nanotubes have recently become a strong competitor to existing materials in the fields of microelectronic devices, smart sensing, and energy conversion. However, since carbon nanotubes are nanomaterials, it is more practical to process them into macroscopic bodies. The current carbon nanotube macroscopic bodies are mainly disordered carbon nanotube paper and ordered carbon nanotube array. It can be produced on a large scale under the condition of technology. Compared with the array that must rely on the substrate, carbon nanotube paper can be self-supporting, and its thickness is controllable, generally in the order of tens of microns to millimeters. The electrical ...

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Problems solved by technology

The advantage of method 1) is that it can prepare a carbon nanotube blanket with a super large area and basically the same orientation of the internal carbon tubes, but the disadvantage is that the equipment is extremely complex and the cost is high, and due to the continuous addition of catalysts, the impurity content in the carbon tube film or fiber is relatively high. On the other hand, since carbon nanotube fibers need to be extracted from the high-temperature (T=1200°C) hydrogen atmosphere to the atmospheric environment, the operational safety and impact on the environment cannot be ignored

The advantage of method 2) is that the size, thickness, density and other parameters of carbon nanotube paper can be freely controlled, and the orientation of carbon tubes in the prepared carbon nanotube paper is also basically the same, but its disadvantage is that the ultra-long carbon nanotubes used as raw materials Arrays and spinnable carbon nanotube arrays are relatively expensive and require equally expensive polished and surface-oxidized silicon wafers as substrates, so their large-scale applications are greatly limited

Method 3) Compared with the first two methods in terms of raw materials and preparation tools, it has obvious advantages, so it has greater practical application value, but there are still many deficiencies in this existing technology. For example, the publication number is CN 1198391C The method for preparing carbon nanotube paper by evaporating the dispersion liquid described in the patent application for invention, it is difficult to obtain relatively dense carbon nanotube paper, and there are also problems with the uniformity and thickness of the product, and it is removed in the presence of a dispersant. The process of dispersant is complicated and the cost is high

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