![]() Towards this, we have developed the Cu-based low cost color tunable anti-scratch heat reflector coating for the THR window (THRW) application.Ĭonventional windows not only pass the visible solar spectrum but also allows near infrared (IR) radiation (known as the source of heat). On the other hand, copper (Cu) has high reflectivity of IR radiation and low market price compared to the Ag and Au. ![]() Similarly, gold (Au) exhibits optimum reflectivity spectrum of heat reflecting coating, but its potential is greatly reduced by the high price. Currently, most IR reflectors are made of silver (Ag) due to its color neutrality. Transparent heat reflecting (THR) coating has a high reflectance at the near infrared (IR) radiation and a high transmittance at the visible region 1, 2. The present work shows promising characteristics of Cu-based THR coating for energy-saving building industry. The wear performance of the TiO 2/Cu/TiO 2 multilayer structure has been evaluated through scratch hardness test. Performance of TiO 2/Cu/TiO 2 heat reflector coating decreases after thermal treatment at 600 ☌. Highest visible transmittance of 90% and IR reflectance of 85% at a wavelength of 1200 nm are demonstrated for the TiO 2/Cu/TiO 2 multilayer thin film after annealing at 500 ☌. Significant enhancement of transmittance in the visible range and reflectance in the infra-red (IR) region has been observed after thermal treatment of TiO 2/Cu/TiO 2 multilayer thin film at 500 ☌ due to the improvement of crystal quality of TiO 2. The impact of thermal treatment on the overall performance of sputter deposited TiO 2/Cu/TiO 2 multilayer thin film on glass substrate is investigated in detail. Color tunable transparent heat reflecting coating was realized through the design of multilayer structure and process optimization. The main highlight is the utilization of Cu, a low-cost material, in-lieu of silver which is widely used in current commercial heat reflecting coating on glass. Multilayer coating structure comprising a copper (Cu) layer sandwiched between titanium dioxide (TiO 2) were demonstrated as a transparent heat reflecting (THR) coating on glass for energy-saving window application.
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