Abstract
This paper presents the spectral reflectance of thermally evaporated ZnS/Ag nanostructures. The coating of ZnS/Ag nanostructures was performed in two steps while varying the film thickness and deposition angle. Silver metal wire (99.99% purity) was heated under vacuum at a pressure of \(2.5 \times 10^{-5}\) mBars and deposited on glass slide substrates in the diffusion pump microprocessor vacuum coater (Edwards AUTO 306). Pieces of zinc sulphide (99.99% purity) were heated and deposited to the glass slides previously coated with silver to form the ZnS/Ag/glass composite. The optical reflectance of the samples was studied by the UV/Vis/NIR spectrometer (Perkin Elmer Lambda 19) with UV-WinLab software. The reflectance was measured at angles of incidence between \(15^o\) and \(75^o\). Spectrophotometric studies showed that reflectance decreased with decrease in film thickness and decreased with increase in deposition angle of silver nanoparticles. The reflectance of ZnS/Ag nanostructures decreased with increase in deposition angle of zinc sulphide.
Highlights
The reflectance properties of surfaces of optical components in several devices in use today require careful tailoring to meet the requirements of technological advances
The reflectance decreased with increase in deposition angle of ZnS
The reflectance results of the multilayer structures of normally and obliquely evaporated ZnS/Ag films on glass substrate show that the reflectance decreased with decrease in film thickness and deposition angle of ZnS
Summary
The reflectance properties of surfaces of optical components in several devices in use today require careful tailoring to meet the requirements of technological advances. Reflective mirrors for use in domestic and industrial housing units in hot climates should have the potential to reflect a high percentage of infrared radiation but transmit a desirable amount of visible light These reflective surfaces are susceptible to environmental degradation. The additional technical characteristic of silver at nano-scale is that of high chemical and optical activity with the capacity to fuse with dielectric materials to form hybrid semiconductor layers [6–8] Whenever materials such as silver, gold, copper, and aluminium are exposed to the environment, they tend to age out due to environmental degradation. It is very important to measure and establish the reflectance values for different angles of incident radiation for every reflecting surface This information is very important in structural design of fenestration especially transparent windows and doors [27]. The authors present the spectral reflectance of ZnS/Ag nanostructures hinged on film thickness, deposition angle and angle of incidence of electromagnetic radiation
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