ZnO nanorods decorated with nanocrystalline (nc)Au Particles:Electronic structure and magnetic behaviours

B. Ghosh, E. M. Benecha, Sekhar C. Ray, Sweety Sarma, W. F. Pong, André M. Strydom, J. J. Wu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electronic structures and magnetic behaviours of zinc oxide nanorods (ZnO-NRs)decorated with nanocrystalline “Au”-particles (nc-Au)have been studied using different spectroscopies, superconducting quantum interference device-type magnetometer and plane wave pseudopotential density functional theory calculations. The presence of intrinsic defects viz. zinc interstitials (Zni)and/or oxygen vacancies (VO)are established using different spectroscopies measurements. Ultraviolet photoelectron spectroscopy and valence band photoemission spectroscopy suggests that the valence band density of states of O 2p - Zn 4sp hybridized states of nc-Au/ZnO-NRs is higher than pure ZnO-NRs that could be correlated with its higher ferromagnetic behaviour. An enhanced room temperature ferromagnetism has been observed when nanocrystalline (nc)gold (Au)particles are decorated on the surface of ZnO-nanorods (ZnO-NRs). This enhanced magnetic moment in nc-Au/ZnO-NRs comes from the metallic electrons of nc-Au that induces large orbital magnetic moment at the nc-Au/ZnO-NR interface. Theoretical calculations shows the enhancement of the density of states at the valence band region of ZnO with a decoration of optimum content nc-Au particles along with the increase of oxygen vacancies in nc-Au/ZnO-NRs; that further confirms the enhancement of magnetization.

Original languageEnglish
Pages (from-to)74-82
Number of pages9
JournalJournal of Alloys and Compounds
Volume797
DOIs
Publication statusPublished - 2019 Aug 15

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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