Study on the grain size, valence state and electrical properties of bismuth ferrite nanofibers

R. Rivera, R. Kappera, M. Sin, M. Chhowalla, A. Safari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report the effect of diameter on the composition, optical, and electronic properties of the BiFeO3 (BFO) nanofibers. Bismuth ferrite nanofibers with different diameter (20 to 150nm) have been fabricated by a sol gel based electrospinning route. The effect of quantum confinement has been found to influence the photoconductivity, grain size and optical properties of the nanofibers. A shift in the band gap to 2.1 eV was observed as a result of the variation on the nanofiber diameter. The position and intensity of the Raman peaks in the low wavenumber are found to shift depending on the diameter due to local stress in the nanofiber. Transmission electron microscopy revealed the nanocrystalline morphology. The composition analysis through energy dispersive detector and electron energy loss spectroscopy revealed the heterogeneous nature of the composition with Bi-rich and Fe-rich regions. X-ray photoelectron spectroscopy results confirmed the combination of Fe3+ and Fe2+ valence state in the nanofibers with a major contribution from Fe3+ which varies with the nanofiber diameter. Photoconductivity measurements show a considerable increase in the current flowing through the nanofibers when measured under illumination. The photoresponse of the nanofibers is increased considerably with decreasing the diameter. This effect is described by a size dependent surface recombination mechanism.

Original languageEnglish
Title of host publication2014 Joint IEEE International Symposium on the Applications of Ferroelectric, International Workshop on Acoustic Transduction Materials and Devices and Workshop on Piezoresponse Force Microscopy, ISAF/IWATMD/PFM 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479938605
DOIs
Publication statusPublished - Oct 13 2014
Event2014 Joint IEEE International Symposium on the Applications of Ferroelectric, International Workshop on Acoustic Transduction Materials and Devices and Workshop on Piezoresponse Force Microscopy, ISAF/IWATMD/PFM 2014 - State College, United States
Duration: May 12 2014May 16 2014

Publication series

Name2014 Joint IEEE International Symposium on the Applications of Ferroelectric, International Workshop on Acoustic Transduction Materials and Devices and Workshop on Piezoresponse Force Microscopy, ISAF/IWATMD/PFM 2014

Other

Other2014 Joint IEEE International Symposium on the Applications of Ferroelectric, International Workshop on Acoustic Transduction Materials and Devices and Workshop on Piezoresponse Force Microscopy, ISAF/IWATMD/PFM 2014
CountryUnited States
CityState College
Period5/12/145/16/14

Keywords

  • Bismuth Ferrite
  • Electrospinning
  • Nanofibers
  • Photoresponse

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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    Rivera, R., Kappera, R., Sin, M., Chhowalla, M., & Safari, A. (2014). Study on the grain size, valence state and electrical properties of bismuth ferrite nanofibers. In 2014 Joint IEEE International Symposium on the Applications of Ferroelectric, International Workshop on Acoustic Transduction Materials and Devices and Workshop on Piezoresponse Force Microscopy, ISAF/IWATMD/PFM 2014 [6923001] (2014 Joint IEEE International Symposium on the Applications of Ferroelectric, International Workshop on Acoustic Transduction Materials and Devices and Workshop on Piezoresponse Force Microscopy, ISAF/IWATMD/PFM 2014). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISAF.2014.6923001