Growth of nanoporous high-entropy oxide thin films by pulsed laser deposition Academic Article uri icon

abstract

  • AbstractHigh-entropy oxides (HEO) with entropic stabilization and compositional flexibility have great potential application in batteries and catalysis. In this work, HEO thin films were synthesized by pulsed laser deposition (PLD) from a rock-salt (Co0.2Ni0.2Cu0.2Mg0.2Zn0.2)O ceramic target. The films exhibited the targets crystal structure, were chemically homogeneous, and possessed a three-dimensional (3D) island morphology with connected randomly shaped nanopores. The effects of varying PLD laser fluence on crystal structure and morphology were explored systematically. Increasing fluence facilitates film crystallization at low substrate temperature (300C) and increases film thickness (60140nm). The lateral size of columnar grains, islands (19nm to 35nm in average size), and nanopores (9.3nm to 20nm in average size) increased with increasing fluence (3.4 to 7.0J/cm2), explained by increased kinetic energy of adatoms and competition between deposition and diffusion. Additionally, increasing fluence reduces the number of undesirable droplets observed on the film surface. The nanoporous HEO films can potentially serve as electrochemical reaction interfaces with tunable surface area and excellent phase stability. Graphical abstract

published proceedings

  • Journal of Materials Research

author list (cited authors)

  • Guo, H., Wang, X., Dupuy, A. D., Schoenung, J. M., & Bowman, W. J.

complete list of authors

  • Guo, Huiming||Wang, Xin||Dupuy, Alexander D||Schoenung, Julie M||Bowman, William J

publication date

  • January 2022