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Carbon Deposition on Hematite (α-Fe2O3) Nanocubes by Annealing in the Air: Morphology Study with Grazing Incidence Small Angle X-ray Scattering (GISAXS)

Canadian Light Source, 44 Innovation Boulevard, Saskatoon, SK S7N 2V3, Canada
Condens. Matter 2020, 5(3), 54; https://doi.org/10.3390/condmat5030054
Received: 20 August 2020 / Revised: 10 September 2020 / Accepted: 16 September 2020 / Published: 17 September 2020
GISAXS has been used to study morphology change of α-Fe2O3 nanocubes after annealing processes. A submonolayer of the nanocubes was deposited on a Si(100) substrate. While an annealing at 400 °C in vacuum does not change a GISAXS pattern from as-prepared nanocubes submonolayer, subsequent annealing in air at the same temperature altered the GISAXS pattern significantly. SEM images showed that the air-annealed nanocubes were coated with thin layers which were identified as amorphous carbon layers based on Raman measurements. GISAXS simulations from morphologies of nanocube with 38 nm side-length and core-shell (nanocube-core and 7 nm thick carbon-shell) reproduced measured patterns from the vacuum- and the air-annealed nanocubes, respectively. The current study provides new approach for in-situ characterization of carbon deposition on a uniform shape nanoparticle through monitoring of deposited carbon thickness. View Full-Text
Keywords: nanocube; GISAXS; hematite; carbon deposition; Raman spectroscopy nanocube; GISAXS; hematite; carbon deposition; Raman spectroscopy
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Kim, C.-Y. Carbon Deposition on Hematite (α-Fe2O3) Nanocubes by Annealing in the Air: Morphology Study with Grazing Incidence Small Angle X-ray Scattering (GISAXS). Condens. Matter 2020, 5, 54.

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