Color tunable low cost transparent heat reflector using copper and titanium oxide for energy saving application

Dalapati, Goutam Kumar; Masudy‐Panah, Saeid; Chua, Sing Teng; Sharma, Mohit; Wong, Ten It; Tan, Hui Ru; Chi, Dongzhi

doi:10.1038/srep20182

Cited by 84 publications

(47 citation statements)

References 62 publications

(80 reference statements)

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“…There are several reports that have been published in the literature about the color properties of different types of thin-film materials (most of these are single-layer), except a couple of them were found to deal with the color properties of multilayer thin-film structures [29][30][31][32][33][34][35][36][37][38][39]. For example, Dalapati et al, reported about the preparation and properties of color-tunable low-cost transparent heat reflectors using copper and titanium oxide for energy-saving applications [40]. However, they proposed to control the color properties of the multilayer structures by means of post-deposition annealing process, which can force the metal layer to transform into an array of nanoparticles and can change the optical properties, e.g., the transmission spectra.…”

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confidence: 99%

Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

et al. 2020

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Coated glass products, and especially the low-emissivity coatings, have become a common building material used in modern architectural projects. More recently, these material systems became common in specialized glazing systems featuring solar energy harvesting. Apart from achieving the stability of optical parameters in multilayer coatings, it is also important to have improved control over the design of visual color properties of the coated glass. We prepare metal-dielectric composite (MDC)-based multilayer thin-film structures using the radio frequency (RF)-magnetron sputtering deposition and report on their optical and chromaticity properties in comparison with these obtained using pure metal-based Dielectric/Metal/Dielectric (DMD) trilayer structures of similar compositions. Experimentally achieved Hunter L, a, b values of MDC-based multilayer building blocks of coatings provide a new outlook on the engineering of future-generation optical coatings with better color consistency and developing approaches to broaden the range of achievable color coordinates and better environmental stability.Low-E coatings can still be expected to represent core technology in advanced windows, whether or not additional technologies are embedded. The Low-E coatings are typically structured as metal-dielectric multilayer thin films, which are designed to prevent heat leakage (from the inside of buildings into the environment) by providing strong and very wide-band reflection of thermal infrared wavelengths.In recent years, the optical properties of metal-dielectric coatings and their influence on building energy efficiency have been studied extensively due to their superior performance compared to other multilayer coating structure types. The metal-dielectric coatings performance mainly depends on the choice of materials and its design philosophy [7][8][9][10][11][12][13][14][15]. Most (or practically all) products available today from this category (featuring high spectral selectivity) employ at least two silver (Ag) layers within their structure, and these coatings cannot withstand prolonged (weeks-scale) exposure to either the ambient atmospheric air or dry-heat test temperatures in excess of 160-180 • C. However, the stability problems of ultrathin Ag layers (normally of less than 20 nm thickness) originate from a range of factors related to the metal layer growth morphology. To overcome these issues, a significant number of research works have been proposed, conducted, and resulted in reporting various solutions, where some of them require more complex materials processing and process parameters optimization [10][11][12][13][14][15][16][17][18][19]. Several reports have been published about the properties of various metal-dielectric composite (MDC) thin-film layer chemistries, including Ag + SiO 2 , Ag + TiO 2 , and Ag + MgF 2 ; however, most of them were about metal-dielectric nanoparticle array properties of interest for various applications [20][21][22][23]. We previously proposed and partially implemented the developmen...

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Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

et al. 2020

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“…Therefore, we need to inevitably compromise the absorptance value to achieve a colourful coating. A number of studies have been reported explaining the effect of different parameters such as thickness, rate of gas flow, anti-reflection layer on the color of a selective coating [3,9,10].…”

Section: Resultsmentioning

confidence: 99%

“…The variation of the absorptance and emittance value with respect to annealing time has been presented in Fig 4a. According to international Energy Agency, the Performance Criterion (PC) of a flat plate collector can be expressed in terms of a change in the absorptance (Δ ) and emittance (Δ ) values by the following relation [4]:……………………………………………………… (10). This relationship indicates the average life time of the flat plate collector for at least 25 years with a decrease in annual solar fraction 5%.…”

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Colored selective absorber coating with excellent durability

et al. 2016

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The colored solar-thermal collectors can provide advantages of architectural integration over energy performance. The colour appearance of the solar-thermal collectors can be achieved by increasing the number of layers. W/WAlN/WAlON/Al 2 O 3 coating, fabricated by DC and RF magnetron sputtering showed a high solar absorptance of 0.948 and the low thermal emittance of 0.08 with a sky blue color appearance. The tandem absorber exhibited excellent long-term thermal stability at 500 °C in air for 100 hrs. The absorber deposited on SS substrates showed high solar selectivity (α/ε) of 0.918/0.11, even after heat treatment in air up to 500°C for 100 hrs. The selective performance of the coating can be stable more than 25 years. The humidity test confirms the significant moisture resistant of the coating. In summary, the new W/WAlN/WAlON/Al 2 O 3-based coating with its colourful appearance is appropriate to be used in solar thermal collectors.

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“…For example, Dalapati et. al., reported about the preparation and properties of color-tunable low-cost transparent heat reflectors using copper and titanium oxide for energy-saving applications [36]. However, they proposed to control the color properties of the multilayer structures by means of post-deposition annealing process, which can force the metal layer to transform into an array of nanoparticles and can change the optical properties e.g.…”

Section: Introductionmentioning

confidence: 99%

Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

Nur-E-Alam¹,

Rahman²,

Basher³

et al. 2020

Preprint

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Over the last decades, the coated glass products, and especially the low-emissivity coatings have become a common building material used in modern architectural projects. More recently, these material systems became common in specialized glazing systems featuring solar energy harvesting. Apart from achieving the stability of optical parameters in multilayer coatings, it is also important to have improved control over the design of visual color properties of the coated glass. We prepare metal-dielectric composite (MDC) based multilayer thin-film structures using the RF-magnetron sputtering deposition and report on their optical and chromaticity properties in comparison with these obtained using pure metal-based Dielectric/Metal/Dielectric (DMD) trilayer structures of similar compositions. Experimentally achieved Hunter L, a, b values of MDC-based multilayer building blocks of coatings provide a new outlook on the engineering of future-generation optical coatings with better color consistency and developing approaches to broaden the range of achievable color coordinates and better environmental stability.

show abstract

Color tunable low cost transparent heat reflector using copper and titanium oxide for energy saving application

Cited by 84 publications

References 62 publications

Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

Colored selective absorber coating with excellent durability

Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

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