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Controllable factors affecting the epitaxial quality of \(\hbox {LaCoO}_{3}\) films grown by polymer-assisted deposition

  • Yanping Zhang
  • Haifeng Liu
  • Ruishi Xie
  • Guohua Ma
  • Jichuan Huo
  • Haibin Wang
Article
  • 61 Downloads

Abstract

\(\hbox {LaCoO}_{3}\) epitaxial films grown on (100) \(\hbox {SrTiO}_{3}\) substrates were prepared by the simple polymer-assisted deposition successfully. Based on the characteristics by X-ray diffractometer, infrared spectroscopy and thermal analyzer, the influence of molecular weight of polyethyleneimine, heat-treatment condition, spin-coating speed on the crystallinity and epitaxial quality of \(\hbox {LaCoO}_{3}\) films were discussed. It is found that the number of –NH groups plays a key role in the cation-chelation of polyethyleneimine. Comparatively, more –NH groups existing in polyethyleneimine with larger molecular weight contribute to the improvement of epitaxial quality of \(\hbox {LaCoO}_{3}\) epitaxial film. When polyethyleneimine begins to release the bound metal ions, higher heat-treatment temperature and a relatively rapid rate of heating can effectively prevent nucleus from growing in other orientations, thereby improving the epitaxial quality of film. Besides, the choice of spin speed will directly affect the thickness and surface roughness of the film, and may even affect the structure and performance of the film. The results will help to understand the cation-chelation mechanism of polyethyleneimine in the polymer-assisted deposition and extend this simple method for preparation of epitaxial films.

Keywords

Polymer-assisted deposition \(\hbox {LaCoO}_{3}\) epitaxial film polyethyleneimine 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant no. 51502249); the Scientific Research Fund of Education Department of Sichuan Province (grant nos. 16ZA0133 and 15ZB0108); and the Doctoral Foundation of Southwest University of Science and Technology (grant no. 15zx7105).

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyangPeople’s Republic of China
  2. 2.Analytical and Testing CenterSouthwest University of Science and TechnologyMianyangPeople’s Republic of China
  3. 3.School of Chemistry and Chemical EngineeringMianyang Normal UniversityMianyangPeople’s Republic of China

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