Sensitivity of Micro-Raman Spectrum to Crystallite Size of Electrospray-Deposited and Post-Annealed Films of Iron-Oxide Nanoparticle Suspensions

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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 (X660 – X225). 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-Fe2O3) 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.

Keywords: CRYSTALLITE SIZE; ELECTROSPRAY DEPOSITION; HEMATITE; IRON OXIDE; LASER HEATING; MAGHEMITE; MICRO-RAMAN SPECTROSCOPY; NANOSTRUCTURED FILM

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209788559539

Affiliations: 1: Department of Energy, Environmental, and Chemical Engineering, Campus Box 1180, Washington University in St. Louis, St. Louis, Missouri 63130; Center for Materials Innovation, Washington University in St. Louis, St. Louis, Missouri 63130 2: Department of Earth and Planetary Sciences, Campus Box 1169, Washington University in St. Louis, St. Louis, Missouri 63130; Center for Materials Innovation, Washington University in St. Louis, St. Louis, Missouri 63130 3: Department of Energy, Environmental, and Chemical Engineering, Campus Box 1180, Washington University in St. Louis, St. Louis, Missouri 63130; Center for Materials Innovation, Washington University in St. Louis, St. Louis, Missouri 63130

Publication date: June 1, 2009

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