期刊
SURFACE & COATINGS TECHNOLOGY
卷 262, 期 -, 页码 21-25出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.11.063
关键词
Super-black coating; Carbon nanotubes; Stray light reduction; Spray coating
资金
- National Research Foundation, Prime Minister's Office, Singapore
- Israel Ministry of Trade and Industry under its NES Magnet program
Stray light, also known as optical noise, affects the performance of many optical devices. It can be reduced to a tolerable level by well-designed and well-baffled system or/and by using functional black coatings that are fabricated in a complex and costly process. Carbon nanotubes (CNTs) absorb light strongly, making them an ideal candidate for realizing a super black coating. CNT coatings were formed by spraying formulations composed of a silicon binder and low cost multiwalled CNTs on a pre-heated aluminum plate. The diffuse reflectance of the coatings in the VIS range (350-800 nm) was in the range of 2.6-5.11%, depending on the MWCNT concentration in the coating. In the NIR range (850-2400 nm), the reflectance values were in the range of 4-6.5%, however the dependence on MWCNT concentration was not very significant. Excellent adhesion to the aluminum substrates was achieved, for coatings with CNT concentration below 15%, while still having very low reflectance, even at temperature cycling between 200 degrees C and -196 degrees C. The proposed coating formulations enable simple and low cost approach for producing high light-absorbing coating of complex 3D structures within a very short time by wet deposition of CNTs. (C) 2014 Elsevier B.V. All rights reserved.
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