High-optical-absorption carbon nanomaterial and preparation method thereof

Abstract

The invention belongs to the field of optical absorption, and discloses a high-optical-absorption carbon nanomaterial which comprises carbon black and carbon nanowalls which grow on the surface of the carbon black through a chemical vapor deposition method and have light trapping capacity, and light absorption is achieved through gap structures between the walls. A radio frequency plasma enhanced chemical vapor deposition process is adopted, a mode of increasing plasma energy density by using inert gas is adopted, chemical bonds of carbon source gas are opened under the action of reducing gas hydrogen, a vertically arranged carbon nano wall is constructed on the surface of carbon black through the processes of nucleation, migration, orientation, growth and the like, the effective refractive index is close to 1, the material has good interface impedance matching, incident light penetrates through the surface of the material to enter clearance spaces of walls in an almost non-reflection mode and is finally absorbed and converted into heat energy through multiple times of reflection between the walls, and efficient optical absorption in ultraviolet-visible light wave bands is achieved under the combined action of the physical mechanisms.

Description

technical field [0001] The invention belongs to the technical field of optical materials, and relates to a high optical absorption carbon nanometer material and a preparation method thereof. Background technique [0002] Optical absorbing materials are functional materials widely used in space optical load systems such as reconnaissance, observation, and remote sensing. The effective observation of weak signal targets plays an important role in the application fields of space cameras, star sensors, and space telescopes. The structure of traditional absorbing coating materials is relatively dense, and there is a sudden change in refractive index between the coating and air, and their interface impedance matching is low, resulting in high reflection of light at the interface and reducing the light absorption capacity of the material. However, there are almost no materials with a refractive index less than 1.3 in nature, and it is difficult to achieve a low refractive index di...

AI Technical Summary

Problems solved by technology

The structure of traditional absorbing coating materials is relatively dense, and there is a sudden change in refractive index between the coating and the air, and their interface impedance matching is low, resulting in high reflection of light at the interface and reducing the light absorption capacity of the material.

However, there are almost no materials with a refractive index less than 1.3 in nature, and it is difficult to achieve a low refractive index difference at the material-air interface, which limits the development of traditional light-absorbing coatings.

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