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We prepared Au-LaNiO 3Àd (Au-LNO) nanocomposite thin films by a sol-gel coating method. The effects of the doped Au on the microstructure and electrical properties of the Au-LNO films under different types of thermal strain were investigated. Introduction of Au into the LNO films changed their preferential orientation and markedly lowered their room-temperature resistivity. Moreover, the resistivity of the films containing Au nanoparticles showed negligible dependence on thermal strain, in contrast to the behavior of Au-free LNO films. We performed microstrain analysis and x-ray photoelectron spectroscopy to explore the strain-resistivity relationship of the films. Microstrain was closely related to the density of oxygen vacancies in LNO films and dominated the change in electrical properties of polycrystalline LNO films. The addition of Au promoted crystallization of the LNO films and decreased the density of oxygen vacancies, which stabilized the microstrain in the films under different external strain and accounted for the strain independence of the resistivity of the Au-LNO films.

In this work, we prepared LaNiO3 (LNO) and Au-LaNiO3 (Au-LNO) films using sol–gel multilayer coating method. The effects of lattice mismatch on the microstructure and electrical properties of the films were investigated by choosing different single-crystal substrate. XRD, SEM, and AFM results showed the high quality of LNO and Au-LNO films, indicating the successful epitaxial growth of the films on the single-crystal substrates. The room temperature resistivity of LNO films increased with the increase of lattice mismatch while different tendency was observed in Au-LNO films, suggesting that different mechanisms prevailed in the LNO and Au-LNO films. Both the transport behavior and the residual resistivity ratio were checked to explore the relationship between the lattice mismatch and the electrical properties of the films. Strain and defect concentration were proposed as the predominating factors for the changes in the resistivity of LNO and Au-LNO films under the influence of lattice mismatch.