Fabrication of Self‐Cleaning CNT‐Based Near‐Perfect Solar Absorber Coating for Non‐Evacuated Concentrated Solar Power Applications

Bera, Ranadip; Binyamin, Yaniv; Frantz, Cathy; Uhlig, Ralf; Magdassi, Shlomo; Mandler, Daniel

doi:10.1002/ente.202000699

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…[6] Other techniques, such as electroless plating coating, black solution spraying, and plasma electrolytic oxidation, have yet to be able to absorb 98% of broadband light, particularly in the ultraviolet to terahertz (THz) wavelength range. [15][16][17][18][19][20][21][22] Carbon nanofibers (CNFs) are perfect for integration into aluminum alloys because of their remarkable chemical and physical characteristics along with their low growth temperature under 600 °C. There has yet to be any attempt to combine CNFs on the aluminum alloy for use in broadband light absorbers.…”

Section: Introductionmentioning

confidence: 99%

Super Black Coating on the Commercial Black Anodized Al(6061) by Direct and Scalable CVD–Growth of Carbon Nanofibers

Truong,

Yuk,

Kim

et al. 2024

Adv Materials Inter

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Using carbon‐based super black coatings on optical devices can achieve superior stray light suppression for applications in astronomy. For the first time, the work presents carbon nanofiber‐based black coating on commercial anodized Al(6061), which facilitates the development of a highly effective route to directly integrate the carbon‐based material on the common substrate for optical baffles. The scalable and available structural engineering effect is synergized with the anodized Al(6061) coating with black dye composed of nickel catalyst and the intrinsic broadband light absorption of the CVD‐grown carbon material to ultimately achieve a superior broadband light absorber. Nickel catalysts embedded in anodized Al(6061) offer a practical pathway for carbon nanofiber growth through CVD without additional stacked catalysts. The CVD‐growing mechanism and CNF nanostructures are demonstrated through TEM and EDS element mapping, SEM, and Raman spectroscopy. CNF‐grown Al(6061) substrates offer above 99% broadband light absorption and low light reflectance below 1% in UV–vis–NIR and mid–IR ranges. This facile approach has been useful for super black coating on Al(6061)‐based complicated sculptures, such as concave substrate and an optical baffle. These results have demonstrated a facile method that can significantly impact the industrial scaling‐up of high‐quality, super‐black coating on spaceborne devices.

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Section: Introductionmentioning

confidence: 99%

Super Black Coating on the Commercial Black Anodized Al(6061) by Direct and Scalable CVD–Growth of Carbon Nanofibers

Truong,

Yuk,

Kim

et al. 2024

Adv Materials Inter

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“…Treating a surface with plasma creates a long-lasting nano-scale layer that uniformly covers a surface within minutes in a non-destructive process. It can confer water or oil philicity/phobicity properties that can be used in solar power applications, reduction of stray light in optical systems, and self-cleaning systems [3][4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic and Low Reflectance Carbon Nanotubes Buckypapers

Campos

Rocha

et al. 2022

Mat. Res.

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In this paper, carbon nanotube (CNT) buckypapers (BPs) were produced by vacuum filtration of CNT water suspensions prepared by sonication using 0.5 wt % of Triton X-100 dispersing agent. The as-produced BPs were efficiently dispersed and presented very low optical reflectance, with an average reflectance of 1.30% in the visible range and hydrophilic/oleophilic properties, readily absorbing water or oil liquid drops through their network of pores. Plasma treatment with 1, 1, 1, 2 tetrafluoroethane (C 2 H 2 F 4 ) turned the BPs superhydrophobic with water contact angles (CA) greater than 140°, while still maintaining their oleophilic properties unchanged. This effect is attributed to the combination of the decrease of surface energy and modification of the surface structure with micro/ nanopores due to the coating with a fluorocarbon film. After only 1 minute plasma treatment, the BPs presented high hydrophobicity (CA = 145°) while keeping their oleophilicity and the very low optical reflectance essentially unaffected. These results indicate that a good combination of low reflectance and a superhydrophobic/oleophilic behavior can be achieved which is of importance for technological applications that require super black surfaces and prevent water from being absorbed, improving the handling of optical signals and increasing the useful life of materials.

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“…However, these coatings were thermally stable in air at 350 C for 100 hours. 18 Liao et al developed RGO based spectrally selective coatings on aluminum substrates with high solar absorptance (0.92) and low thermal emittance (0.04) using sol-gel technique. 19 Few researchers have used reduced graphene oxide for solar cells applications and also used it as fillers in fluids for solar steam generation.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 Bera et al developed CNT based coatings for non‐evacuated concentrated solar thermal applications. However, these coatings were thermally stable in air at 350°C for 100 hours 18 . Liao et al developed RGO based spectrally selective coatings on aluminum substrates with high solar absorptance (0.92) and low thermal emittance (0.04) using sol‐gel technique 19 .…”

Section: Introductionmentioning

confidence: 99%

Sprayable reduced graphene oxide based high‐temperature solar absorber coatings for concentrated solar power applications

Nagarajan¹,

Karthik

Jose

et al. 2021

Intl J of Energy Research

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Summary Reduced graphene oxide (RGO) based composite non‐selective solar absorber coatings (RGO/silicate) were developed using a simple spray technique. RGO powders were prepared using the modified Hummers' method. RGO‐silicate suspensions were obtained by adding an appropriate quantity of RGO in a sodium silicate solution. Transmission electron microscopy studies showed the corrugated morphology of reduced graphene oxide powders. The presence of RGO in the composite absorber coatings was confirmed by X‐ray photoelectron spectroscopy data. In order to study the thermal stability, the coatings were deposited on stainless steel (SS) and Inconel substrates. The composite nonselective coating exhibited an absorptance (α) of 0.96 and emittance (ε) of 0.88 at 82°C on SS and Inconel substrates. The coatings sprayed on SS substrates showed good thermal stability for 428 hours at 500°C in air. The coatings sprayed on Inconel substrates were thermally stable in air at 600°C for 96 hours. The performance evaluation tests revealed that these coatings can be used for concentrated solar power applications.

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Fabrication of Self‐Cleaning CNT‐Based Near‐Perfect Solar Absorber Coating for Non‐Evacuated Concentrated Solar Power Applications

Cited by 13 publications

References 32 publications

Super Black Coating on the Commercial Black Anodized Al(6061) by Direct and Scalable CVD–Growth of Carbon Nanofibers

Super Black Coating on the Commercial Black Anodized Al(6061) by Direct and Scalable CVD–Growth of Carbon Nanofibers

Superhydrophobic and Low Reflectance Carbon Nanotubes Buckypapers

Sprayable reduced graphene oxide based high‐temperature solar absorber coatings for concentrated solar power applications

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