Effects of Ti transition layer on stability of silver/titanium dioxide multilayered structure

Wang, Zhenguo; Cai, Xun; Chen, Qiulong; Chu, Paul K.

doi:10.1016/j.tsf.2006.08.040

Cited by 26 publications

(19 citation statements)

References 20 publications

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“…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.…”

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“…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].…”

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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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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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“…Silver has also been recognized as a well-matched biomaterial, mechanically and chemically stable, and various techniques can be applied to modify its surface properties. Moreover, in wear conditions, the incorporation of silver (Ag) into titanium (Ti) compounds can change their properties by acting as a solid lubricant [5][6][7]. Ti embedded in a carbon (C) matrix could improve adherence of the coated substrates to obtain better hardness and anticorrosive properties [8,9].…”

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Synthesis and Characterization of Complex Nanostructured Thin Films Based on Titanium for Industrial Applications

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Titanium-based composites—titanium and silver (TiAg) and titanium and carbon (TiC)—were synthesized by the Thermionic Vacuum Arc (TVA) method on substrates especially for gear wheels and camshaft coating as mechanical components of irrigation pumps. The films were characterized by surface morphology, microstructure, and roughness through X-ray Diffraction (XRD), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Small-Angle Neutron Scattering (SANS). The silver (Ag) films crystallized into a cubic system with lattice a = 4.0833 Å at room temperature, indexed as cubic Ag group Fm3m. The crystallites were oriented in the [111] direction, and mean grain size was <D>111 = 265 Å. The TiC structure revealed a predominant cubic TiC phase, with a = 0.4098 as a lattice parameter determined by Cohen’s method. Average roughness (Ra) was 8 nm for the as-grown 170 nm thick TiAg film, and 1.8 nm for the as-grown 120 nm thick TiC film. Characteristic SANS contribution was detected from the TiAg layer deposited on a substrate of high-quality stainless steel with 0.45% carbon (OLC45) in the range of 0.015 Å−1 ≤ Q ≤ 0.4 Å−1, revealing the presence of sharp surfaces and an averaged triaxial ellipsoidal core-shell object.

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“…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 [6][7][8][9][10][11][12][13][14]. Most (or practically all) products available today from this category (featuring high spectral selectivity and high LSG) 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.…”

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

Effects of Ti transition layer on stability of silver/titanium dioxide multilayered structure

Cited by 26 publications

References 20 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

Synthesis and Characterization of Complex Nanostructured Thin Films Based on Titanium for Industrial Applications

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

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