The application of nanosized silver colloids in far infrared low-emissive coating

In this study, far infrared low-emissive coatings have been prepared using a spin-coated 2-μm layer of commercial inorganic binder under a spin-coat produced from nanosized silver solution, resulting in Ag films of thicknesses between 0.1 and 1 μm. The bilayer coatings were baked at various temperatures for 30 min in air. The 1-μm Ag film baked at 150 °C exhibited an extremely low emissivity of 0.04 in the far infrared range wavelengths of 8 to 14 μm. In addition, this nano-silver paint showed good adhesive strength and the capability to withstand a neutral salt test.