Abstract
Solar absorbers are the heart of sustainable photothermal utilization. To obtain higher photothermal conversion efficiency, nanomultilayer absorbers with low emissivity are undoubtedly the best choice. However, the strategy of co-sputtering with at least two targets is usually employed, which makes the preparation process complex and costly, so it is necessary to develop a one-step sputtering preparation through a target. Herein, we propose preparation of Ti–TiOx nanomultilayer solar selective absorption coatings (SSACs) with a single metal Ti target by one-step sputtering. The self-doped Ti nanoparticles as well as the Ti2+, Ti3+ and Ti4+ oxides in TiOx matrix can easily customize the band gap from ultraviolet to visible light, resulting in a high absorption of 0.92 and a low thermal emissivity of 0.07 (298.15K). The obtained Ti–TiOx SSACs exhibit excellent thermal stability after heat treatment at 250 °C for 300 h in air. More significantly, the measured surface temperature reached 114.5 °C under 1.5 suns simulated illumination, indicating its outstanding solar-thermal conversion ability. This work extends the application range of the titanium oxide, developing a simple method for designing low-emissivity solar absorbers.
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