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•A new process of magnetron sputtering silver onto porous diatomite was proposed.•Such silver coating obtained by magnetron sputtering has high degree of crystallization and low surface roughness.•The infrared emissivity of such silver-coated diatomite also showed good performance.
Diatomite has delicate porous structures and various shapes, making them ideal templates for microscopic core–shell particles fabrication. In this study, a new process of magnetron sputtering assisted with photoresist positioning was proposed to fabricate lightweight silver coated porous diatomite with superior coating quality and performance. The diatomite has been treated with different sputtering time to investigate the silver film growing process on the surface. The morphologies, constituents, phase structures and surface roughness of the silver coated diatomite were analyzed with SEM, EDS, XRD and AFM respectively. The results showed that the optimized magnetron sputtering time was 8–16min, under which the diatomite templates were successfully coated with uniform silver film, which exhibits face centered cubic (fcc) structure, and the initial porous structures were kept. Moreover, this silver coating has lower surface roughness (RMS 4.513±0.2nm) than that obtained by electroless plating (RMS 15.692±0.5nm). And the infrared emissivity of coatings made with magnetron sputtering and electroless plating silver coated diatomite can reach to the lowest value of 0.528 and 0.716 respectively.