Broadband visible to mid-infrared aluminum-black absorbers and the aging behavior

Huang, Yuancan; Yang, Suhui; Ling, Chen; Li, Zhuo; Wang, Xin; Zhang, Jinying; Liao, Yingqi

doi:10.1016/j.infrared.2021.103735

Cited by 9 publications

(11 citation statements)

References 40 publications

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“…Generally, black metals are considered to be stable up to 300 °C. [ 5 ] Several metals, such as silver, [ 6 ] gold, [ 7,8 ] platinum, [ 9 ] tungsten, [ 10 ] titanium, [ 11 ] palladium, [ 12 ] and aluminum, [ 13,14 ] are known to be fabricated in the form of black metals. Black aluminum (Black Al) is a metal that has good thermal stability and at the same time is inexpensive to produce.…”

Section: Introductionmentioning

confidence: 99%

“…[3,4] Such coatings must have good thermal stability, namely they must retain their porous structure and, consequently, heatabsorbing properties at elevated temperatures. Generally, black metals are considered to be stable up to 300 C. [5] Several metals, such as silver, [6] gold, [7,8] platinum, [9] tungsten, [10] titanium, [11] palladium, [12] and aluminum, [13,14] are known to be fabricated in the form of black metals. Black aluminum (Black Al) is a metal that has good thermal stability and at the same time is inexpensive to produce.…”

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confidence: 99%

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Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Romanova

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Novotný

et al. 2021

Physica Status Solidi (b)

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The thermal stability of black aluminum (Black Al) films deposited on unheated fused silica substrates by pulsed DC magnetron sputtering is investigated. The deposited films have porous moth‐eye morphology and a relatively soft surface that can be easily damaged mechanically. Photothermally stimulated exoelectron emission (PTSE) spectra of the films have emission peaks at 180 and 300 °C, which can be associated with processes of aluminum recrystallization occurring at these temperatures. The total emitted charge of PTSE decreases according to a power law with each subsequent heating, indicating that the most pronounced structural changes on the film surface occur during its first annealing. The shape of the mechanically intact pores of the films does not change after heating. However, spiral‐shaped aluminum nanowires grow from scratches and abrasions on the film surface already after heating up to 200 °C due to the stress‐induced migration of aluminum atoms. When scratches are deliberately applied to the surface of an already annealed film, the nanowires do not grow when the film is reheated. The results of this study show that mechanically intact as‐deposited Black Al films are thermally stable up to temperatures of at least 400 °C.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Romanova

More-Chevalier

Novotný

et al. 2021

Physica Status Solidi (b)

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“…The green dashed line in Figure b is the measured total transmission spectrum of the silver black film on the quartz glass. The transmission expression is , where T all is the measured total transmission of silver black films on quartz glass and T glass is the transmission of quartz glass. The transmission of the quartz glass can be excluded according to eq to obtain the transmission of the monolayer silver black film ( T silver black ).…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, the vis–NIR reflection of the silver black film was measured, as shown by blue dashed lines. The measured reflection partially consisted of silver black films and was partially reflected by the glass substrate, as shown in Figure , which can be written as , where R all is the measured reflection of the silver black coatings on quartz glass and R glass is the reflection of quartz glass. Because of the low reflection of the glass substrate and the low transmission of the silver black film, the third term and subsequent terms in eq were as low as 1‰, which can be ignored.…”

Section: Resultsmentioning

confidence: 99%

“…The long-term stability of the optical properties is worthy of attention for applications . The aging behaviors of gold black and aluminum black films have been reported; , both appeared to have a certain degree of absorption loss after room temperature aging. Gaur et al reported that the absorption loss of gold black films reached nearly 7% at a wavelength of 10 μm .…”

Section: Introductionmentioning

confidence: 99%

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Nanoscale-Thick Silver Black Films Fabricated in He/Ar Inert Gas Conditions for Broadband Absorbers

Huang

Yang

Ling

et al. 2022

ACS Appl. Nano Mater.

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Broadband light absorbers are attractive for their applications in photodetection and photothermic conversion. Metal black absorbers are highly nanoscale porous deposits in the presence of inert gas and exhibit nanoscale structure. Silver nanoparticles have attracted intensive research interest because of their distinctive electrical and optical properties. Here, we fabricated a number of silver black films with nanoscale thicknesses under various gas ambient atmospheres (He and Ar). Our aim is to fabricate broadband absorbers with high absorption performance from the visible-to-mid-IR (MIR) spectral range and investigate their aging behaviors. The He-ambient silver black film exhibited average absorption coefficients of 3.17, 2.27, and 1.81 μm–1 in the visible, near-IR (NIR), and MIR ranges, respectively, with the highest value of 6.50 μm–1 at a wavelength of 357 nm. Those of the Ar-ambient film were 0.48, 0.51, and 0.443 μm–1 in visible, NIR, and MIR ranges, respectively. The absorption coefficients of the He-ambient film were much higher than those of the Ar-ambient film, which were very promising candidates as broadband absorbers. Moreover, metal black films suffered from aging phenomena because of their nanoscale porous structure. The long-term stability of the optical properties was worthy of attention for applications. Therefore, the room temperature aging behaviors of nanoscale-thick silver black films were investigated. Comparative analyses of the atomic content before/after aging demonstrated that the aging was attributed to crystallization, deliquescence, and oxidation. Comparative analyses of the absorption and photothermal response characteristics before/after aging were also performed. The results demonstrated that the nanoscale-thick silver black films possessed great absorption stability in the visible-to-MIR range and photothermal response stability, which can provide valuable reference for applications of broadband absorbers such as IR dynamic scene generation.

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Ultralarge Pixel Array Photothermal Film based on 3D Self‐Suspended Microbridge Structure for Infrared Scene Projection

Huang

Yang

Ling

et al. 2023

Small

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Infrared emitter is highly desirable for applications in infrared imaging and infrared stealth technology. It is also a core device in infrared scene generation. Light‐driven photothermal film has attracted considerable interest due to its outstanding photothermal properties and easy fabrication. However, the existing photothermal films suffer from low photothermal conversion efficiency (PCE) as well as small sizes. The improvement of the PCE is usually achieved at the expense of dynamic frame rate. Here, this work designs and fabricates a photothermal film based on 3D self‐suspended microbridge structure. Silicon (Si) microbridges are introduced into each microstructure to manipulate the thermal conductivity of the films. By optimizing the parameters of the Si microbridges, the high PCE and fast frame rate are both achieved. Moreover, the 3D structure microbridge film is 4‐inch in diameter, forming an ultralarge array with over 2200 × 2200 pixels. Finally, a high PCE infrared scene projector is realized based on this photothermal film. A visible image is projected on the film, the 3D‐microstructured photothermal film absorbs the visible light and emits an infrared image same as the visible one with high resolution and fast frame rate due to the excellent photothermal properties.

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Broadband visible to mid-infrared aluminum-black absorbers and the aging behavior

Cited by 9 publications

References 40 publications

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Nanoscale-Thick Silver Black Films Fabricated in He/Ar Inert Gas Conditions for Broadband Absorbers

Ultralarge Pixel Array Photothermal Film based on 3D Self‐Suspended Microbridge Structure for Infrared Scene Projection

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