Chinese Scholars Have Developed Ultra-black Light Absorption Coating With A Light Absorption Rate As High As 99%

- Apr 26, 2019-

Chinese scholars have developed ultra-black light absorption coating with a light absorption rate as high as 99%

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Recently, ningbo institute of materials, Chinese academy of sciences advanced coating and additive manufacturing technology team after years of research, successfully developed a super-black coating. The absorption rate of 200nm-25 m band is up to 99%. The coating can be deposited on the surface of a variety of substrates, and large area of batch preparation can be realized at the same time, and it can adapt to the extreme service environment of high temperature, low temperature, vacuum, liquid and so on, with a very broad application prospect.

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FIG. 1 ultra black coatings developed by the advanced coatings and additive manufacturing team

 

Ultra - black coatings have been or potential applications in a wide range of fields. For example, when the space infrared astronomical telescope is in the working state, its internal components will produce trace infrared ray due to heat, thus interfering with the observation of the space target band of the instrument. Therefore, it is necessary to absorb the optical interference generated by the instrument itself, so as to improve the sensitivity of the telescope to the target signal. Of course, the shielding of impurities is not only necessary for astronomical telescopes, but also for all precision optical instruments, such as Raman, ultraviolet and infrared spectrometers. In addition, optical or microwave anechoic Chambers need to be truly "dark" to ensure that the internal instruments work without interference. At the same time, the military also needs stealth technology, such as military equipment or personnel to provide a variety of necessary camouflage. In addition, solar cells also need to enhance the absorption of specific light sources to improve energy conversion efficiency.

 

The research of light - absorbing materials focuses on ultra - black matter. When light interacts with an object, some of the energy is absorbed by the object, while some of the unabsorbed energy is reflected, scattered or transmitted. The reflected and scattered parts affect the color of the object we observe. When all visible light is absorbed by an object, the object appears black, so the blacker the material, the wider the range of light it absorbs. The difficulty of related research lies not only in the development of ultra-black substance itself, but also in the development of preparation technology of ultra-black coating, because only the preparation of ultra-black substance as coating can achieve its long-term work. Moreover, the application scenarios have various needs for the substrate, and the service conditions of the coating are different, which leads to the difficulties in the development of ultra-black coating.

 

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FIG. 2 ultra black coatings developed by the advanced coatings and additive manufacturing team

 

 

After many years of research, ningbo institute of materials, Chinese academy of sciences advanced coating and additive manufacturing technology team researchers successfully developed a new type of superblack material, and developed a new type of superblack coating. The coating can be deposited on almost all substrate surfaces, including flexible substrates, without limitation in size and shape, and can achieve efficient and large-area controllable preparation, which can be used in extreme environments such as ultra-low temperature, high temperature, vacuum and liquid. It has been tested by a third party authority and has an absorption rate of up to 99% at 200nm-25 m band. At the same time, the ultra-black coating material used in the ultra-light, will not increase the weight of the instrument itself.

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FIG. 3 demonstration of light absorption effect of ultra-black coating

 

In addition to space exploration, precision instruments, ultra-dark Chambers, and photovoltaic modules, the coating is expected to be used in all areas requiring optical signal control, including satellite optical positioning, digital cameras, building insulation, and visual art design. In the future, more potential applications are expected to continue to be developed, which will be a vast blue sea.

 

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FIG. 4 absorbance test results of third-party testing institutions