Abstract
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.
Highlights
Hematite (α-Fe2 O3 ) is a strong candidate for photocatalytic applications because its band gap (2.1 eV) can give the maximum theoretical solar-to-hydrogen efficiency of ~15% and is corrosion-resistance to harsh oxidation conditions [1,2]
The current study provides new approach for in-situ characterization of carbon deposition on a uniform shape nanoparticle through monitoring of deposited carbon thickness
In a submonolayer of the nanocubes formed on a substrate, the nanocube would adsorb with its faces, not edge nor vertex, the on substrate
Summary
Hematite (α-Fe2 O3 ) is a strong candidate for photocatalytic applications because its band gap (2.1 eV) can give the maximum theoretical solar-to-hydrogen efficiency of ~15% and is corrosion-resistance to harsh oxidation conditions [1,2]. A passivation of the surface trap state through a surface layer coating enhanced photocatalytic performance [21,22]. The current study shows that it is possible to coat carbon on the hematite nanocube by chloride additive [25], carbonization of the n-butane (fire treatment) [26]. Shows that it is possible to coat carbon on the hematite nanocube by annealing in air without using any be very useful to correlate the catalytic performance to the thickness of coated carbon agent Itatwould all. 2} GISAXS faces of technique the hematite athe submonolayer film of monodispersive hematite the to nanocubes by air annealing and its effect to particle morphology. Characterize the carbon deposition on the {0112} faces of the hematite nanocubes by air annealing and its effect to particle morphology
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