Carbon deposition on hematite ($α$-Fe$_2$O$_3$) nanocubes by an annealing in the air: morphology study with grazing incidence small angle X-ray scattering (GISAXS)

Chang-Yong Kim

doi:10.3390/condmat5030054

paper

Carbon deposition on hematite ( $α$ -Fe $_{2}$ O $_{3}$ ) nanocubes by an annealing in the air: morphology study with grazing incidence small angle X-ray scattering (GISAXS)

arXiv:2008.01775 · doi:10.3390/condmat5030054

Abstract

GISAXS has been used to study morphology change of $α$ -Fe $_{2}$ O $_{3}$ nanocubes after annealing processes. A submonolayer of the nanocubes was deposited on a Si(100) substrate. While an annealing at 400 $^{\circ}$ C in a vacuum does not change a GISAXS pattern from as-prepared nanocubes submonolayer, annealing in the air at the same temperature altered the GISAXS pattern significantly. SEM image 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) nicely reproduced measured patterns from the vacuum annealed 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.

15 pages, 6 figures

References in corpus (1)

Atomic Structure of Hematite ( $α$ -Fe $_{2}$ O $_{3}$ ) Nanocube Surface; Synchrotron X-ray Diffraction Study

Carbon deposition on hematite (α-Fe2​O3​) nanocubes by an annealing in the air: morphology study with grazing incidence small angle X-ray scattering (GISAXS)

Abstract

References in corpus (1)

Carbon deposition on hematite ( $α$ -Fe $_{2}$ O $_{3}$ ) nanocubes by an annealing in the air: morphology study with grazing incidence small angle X-ray scattering (GISAXS)