Optical properties of unprotected and protected sputtered silver films: Surface morphology vs. UV/VIS reflectance

Abstract

The optical properties of opaque sputtered silver films are investigated and related to their surface morphology. As reference, an evaporated sample produced by thermal flash evaporation has been studied, too. Standard optical and electrical characterizations as well as scanning electron microscopy (SEM) and X-ray reflectometry have been carried out with unprotected silver films directly after deposition and reveal strong correlations between the corresponding characterization results. The aging behavior of the normal incidence reflectance has been studied over a time period of 36 weeks. Protected silver mirrors have been prepared by sputtering using silica and alumina as the protective coating. It is shown by model calculations that the main spectral features occurring in the reflectance spectra of as-deposited unprotected coatings, unprotected coatings after aging, and protected coatings can be reproduced assuming a rough silver surface covered by a corresponding ultrathin absorbing interface layer or overlayer.

Scalable and Reconfigurable Green Electronic Textiles with Personalized Comfort Management

“…At roughly 15:00, in comparison to commercial cotton and polyester covering, the temperature is 1.9 and 1.7 °C cooler under RGET coverage, respectively (Figure f). This is attributed to the fact that the cooling effect of RGET is mainly determined by two factors: (1) in the MIR region, the high emissivity of PLA indicates that the radiative cooling of RGET dominates; and (2) in the visible and near-infrared regions, EGaIn alloy with naturally smooth surfaces exhibits high reflectivity, where the reflection of RGET dominates. − Additionally, the net cooling of the textile-covered skin temperature at outdoor conditions is explored using a one-dimensional steady-state heat transfer model that comprehensively considered heat conduction, heat convection, and heat radiation from RGET (Figure S18).…”

High-reflective coatings for ground and space based applications

“…The combined effect of the interface roughness and the covering absorbing debris layer leads to a spectral shift of the plasmonic absorption feature. In combination with the appearance of a spectrally broad absorption tail mainly originating from the intrinsic absorption of silver sulfide [3], this mechanism can explain the observed differences between the films and also the loss in reflectance over the entire UV-VIS spectral region as a result of ageing. These influences upon the reflectance of silver films can be modelled [3] applying a model including an absorbing overlayer and a rough silver surface.…”

Green synthesis of titanium dioxide nanoparticles with volatile oil ofEugenia caryophyllatafor enhanced antimicrobial activities

“…The samples’ diffraction peaks were identified by comparison (00‐021‐1272 card, variable slit intensity). The full width at half maximum (FWHM) and Scherer's equation were used to determine the crystallite size [39], The strain value η [40] and the dislocation densities δ values [41] were also calculated. Scanning electron microscope (SEM) (Vega Tescan, USA), at the University of Technology, the Centre for Nanotechnology and Advanced Materials, Iraq, was utilised to analyse NPs.…”