TY - JOUR
T1 - Wet deposition of carbon nanotube black coatings for stray light reduction in optical systems
AU - Azoubel, Suzanna
AU - Cohen, Rina
AU - Magdassi, Shlomo
N1 - Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/1/25
Y1 - 2015/1/25
N2 - 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. °C and -. 196. °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.
AB - 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. °C and -. 196. °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.
KW - Carbon nanotubes
KW - Spray coating
KW - Stray light reduction
KW - Super-black coating
UR - http://www.scopus.com/inward/record.url?scp=84920938460&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2014.11.063
DO - 10.1016/j.surfcoat.2014.11.063
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AN - SCOPUS:84920938460
SN - 0257-8972
VL - 262
SP - 21
EP - 25
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -