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Self-doped W–WOₓ nanocermet multilayer films fabricated by single tungsten target reactive sputtering for selective solar absorption

Wang, Wei, Wen, Huaixing, Ling, San, Li, Zhengtong, Su, Jingbu, Wang, Chengbing
Journal of materials chemistry 2018 v.6 no.32 pp. 15690-15700
absorbance, air, coatings, nanocomposites, nanoparticles, oxygen, thermal stability, tungsten
Metal–dielectric (cermet) solar selective absorber coatings (SSACs) have been extensively utilized in photo-thermal conversion due to their strong broad-band absorbance properties. To achieve plasmonic metal nanoparticles embedded in a dielectric matrix, co-sputtering with two or more targets is required. This makes the preparation process more complex, inevitably increasing the fabrication cost. Therefore, simplifying the production process of SSACs to yield platforms with excellent solar-thermal conversion efficiencies is highly desired. Herein, we developed novel self-doped W–WOₓ nanocermet multilayer SSACs using only a single tungsten target with limited reactive sputtering. During the process, the limited O₂ consumed only part of the sputtered W atoms to form WOₓ, so that plasmonic W nanoparticles were embedded in the WOₓ dielectric matrix and yielded self-doped W–WOₓ nanocomposite films. The resulting deposited self-doped W–WOₓ SSACs possessed high absorptance reaching up 0.93 and low thermal emittance of 0.058. It also possessed excellent thermal stability reaching up 250 °C in air over prolonged periods. Obviously, high-performance self-doped W–WOₓ SSACs are very promising for low-cost and large-scale industrial production.