|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Functional Nanomaterials 2023
||Energetics of nanoscale films consisting of vertically-aligned oxide-metal pillars in nitride matrix
||Sreekar Rayaprolu, Ahmad Ahmad, Haiyan Wang, Anter El-Azab
|On-Site Speaker (Planned)
The three-phase nanocomposite thin film consisting of NiO, and Au pillars in TiN matrix exhibits excellent magneto-optical coupling. Following a template growth process, a recent study showed that NiO deposited on the TiN-Au template nucleates on Au producing an array of ordered nanopillars. Due to the oxygen-deficient NiO, Au-Ni interdiffusion develops Au shell around NiO and segregated clusters of Ni in Au pillars. Here, we report a comparative energetic study confirming that core-shell configuration is energetically favorable compared to configurations representing the system without interdiffusion of Au and Ni. An energy model accounting for the elastic energy due to lattice mismatch strain and capillarity effects, interfacial and chemical energies has been used for this purpose. We found that Au-Ni interdiffusion is immediate with deposition of oxygen-deficient NiO on TiN-Au template, and a critical ratio of Au and NiO pillar heights favors core-shell structure.
||Computational Materials Science & Engineering, Modeling and Simulation, Thin Films and Interfaces