University of Oulu

XPS study of Cu3TeO6 semiconductors synthesized at different pH values

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Author: Jussila, Laura1
Organizations: 1University of Oulu, Faculty of Science, Physics
Format: ebook
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 10.2 MB)
Pages: 46
Persistent link:
Language: English
Published: Oulu : L. Jussila, 2023
Publish Date: 2023-05-22
Thesis type: Master's thesis
Tutor: Fernández-Catalá, Javier
Cao, Wei
Reviewer: Martin Vazquez, Gonzalo


For this thesis, X-ray photoelectron spectroscopy (XPS) was used to study copper tellurates synthesized at different pH values using novel hydrothermal synthesis. Copper tellurate compound (Cu3TeO6) is a semiconductor that belongs to the metal tellurate family and exhibits fascinating electronic and magnetic properties like antiferromagnetism. It also has applications in ceramics and as a possible drug sensor. The new hydrothermal synthesis route provides better control over the composition and size of the nanoparticles. Since there is high interest in these materials and a new synthesis method has been used, a thorough characterization is needed.

XPS is a surface-sensitive method based on the photoelectric effect and is suitable for identifying elements and chemical states in the sample. Here, XPS spectra were peak fitted to identify the binding energies of copper, tellurium, and oxygen species in the samples. Copper was revealed to be Cu(II) species, tellurium spectra included both Te(IV) and Te(VI) components, meanwhile, oxygen spectra had a strong shoulder peak for either hydroxide or defective oxygen, the latter of which would explain the unexpected Te(IV) peak. The results also showed the presence of a hydroxide component, which was removed by calcination. Chemical shifts were observed for copper and tellurium peaks. The findings of this study provide insights into the synthesis and properties of copper tellurates, which can guide future research.

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Copyright information: © Laura Jussila, 2023. Except otherwise noted, the reuse of this document is authorised under a Creative Commons Attribution 4.0 International (CC-BY 4.0) licence ( This means that reuse is allowed provided appropriate credit is given and any changes are indicated. For any use or reproduction of elements that are not owned by the author(s), permission may need to be directly from the respective right holders.