Effect of Interface Structure on the Hydrophobicity, Mechanical and Optical Properties of HfO2/Mo/HfO2 Multilayer Films
Abstract
We report on the super-hydrophobicity and tunable and optical and mechanical properties of transparent HfO2(50 nm)/Mo(20 nm)/HfO2(50 nm) multilayer films facilitated by engineering the ceramic-metal interface microstructure. A comparative study of nano-columnar and glassy (dense) structured HfO2/Mo/HfO2 multilayer films demonstrate the remarkable effect of interface structure on their hydrophobicity and mechanical properties. The nano-columnar structured multilayer films exhibit the dominance over the glassy structured stack in terms of their enhanced characteristics, namely the mechanical characteristics, anti-reflection behavior, visible transmittance, and hydrophobicity. While hydrophobicity is derived from the combined effect of hierarchical surface roughness and nano-columnar structure of the top and bottom Hf-oxide ceramic layers, the enhanced mechanical response is derived from the columnar structure of Mo metallic interlayer vertically aligned with overall multilayer stack. The combination of super-hydrophobicity and enhanced mechanical properties of optically transparent HfO2/Mo/HfO2 multilayer films through HfO2-Mo interface structure control as demonstrated in this work may provide a pathway to further tune the efficiency and in the optimization of architectures for energy-saving applications.
- Publication:
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JOM - Journal of the Minerals, Metals and Materials Society
- Pub Date:
- October 2019
- DOI:
- 10.1007/s11837-019-03614-5
- Bibcode:
- 2019JOM....71j3711D