Local structural studies through EXAFS and effect of Fe2+or Fe3+existence in ZnO Nanoparticles

Chithira Pulickalputhenpura Rajan, Nagendra Abharana, Shambhu Nath Jha, Dibyendu Bhattacharyya, Teny Theresa John

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A simple solution-based chemical precipitation method was used to synthesize the Fe-doped ZnO nanoparticles. X-ray Photoelectron Spectroscopy (XPS) measurement showed that mostly Fe2+ions are incorporated in a lower percentage of Fe doping, while a higher percentage leads to Fe3+. The broad absorption band in the visible range shows the d-d crystal field transitions between the multiplets of 3d5configuration of the high spin Fe3+substituting Zn2+under the influence of a tetrahedral ZnO crystal field. Raman measurement also supports the optical absorption data. ESR results show that the occurrence of broad signals is due to the exchange interactions among the TM ions in the doped samples. Fe exists in a mixed phase in Fe1 and the wide curve in Fe10 is due to the exchange interaction among Fe3+-Fe3+. EXAFS measurements confirm that the spectral features showing the peak edge position is similar to Fe2O3corresponding to the Fe3+state. From this, it can be inferred that Fe exists mostly in a +3 oxidation state in all the samples, but there may be existence of +2 states in the surface layers as observed from XPS measurement. Fe1 shows RTFM with a coercivity of ~70 Oe. The non-saturating, linear magnetic moment at higher applied magnetic field is due to the paramagnetic contribution from the uncoupled Fe3+ ions.

Original languageEnglish
JournalJournal of Physical Chemistry C
DOIs
StatePublished - 1 Jan 2021
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy (all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'Local structural studies through EXAFS and effect of Fe2+or Fe3+existence in ZnO Nanoparticles'. Together they form a unique fingerprint.

Cite this