Sensitivity of micro-raman spectrum to crystallite size of electrospray-deposited and post-annealed films of iron-oxide nanoparticle suspensions

Luis B.Modesto Lopez, Jill D. Pasteris, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

This paper demonstrates the sensitivity of the Raman spectra of electrospray-deposited iron-oxide nanoparticle films to their grain size. The grain size in the films was controlled using the temperature of annealing. The position and width of the bands at - 225, 612, 660, and 1317 δcm -1 were investigated for their sensitivity to both grain size and laser-induced heating, using 532 nm excitation. The parameter most sensitive to grain size was found to be the difference between the band position of the 660 δcm -1 LO and 225 δcm -1 TO bands (X 660 - X 225). The distance between the two bands narrowed with increasing annealing temperature of the films, suggesting that, as grain size increases, these two bands become closer. The 660 δcm -1 band position was very stable regardless of variation in laser power and, thus, laser-induced heating effects. The films were prepared by electrospray deposition of a commercial maghemite (γ-Fe 2O 3) nanoparticle suspension onto a silicon wafer followed by post-annealing in a temperature range of 600-1000 °C for 15 min in an air atmosphere.

Original languageEnglish (US)
Pages (from-to)627-635
Number of pages9
JournalApplied Spectroscopy
Volume63
Issue number6
DOIs
StatePublished - Jun 2009
Externally publishedYes

Keywords

  • Crystallite size
  • Electrospray deposition
  • Hematite
  • Iron oxide
  • Laser heating
  • Maghemite
  • Micro-Raman spectroscopy
  • Nanostructured film

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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