Synthesis of bimetallic aluminum-iron oxide nanorice, nanocubes and nanospheres

Bimetallic oxide nanoparticles are promising materials due to their diverse physical properties. Herein, we synthesized bimetallic aluminum oxide (AlO x )-iron oxide (FeO x ) nanoparticles with different shapes and elemental compositions by tuning the low-temperature solvothermal reaction conditions...

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Bibliographic Details
Published in:New journal of chemistry 2023-07, Vol.47 (3), p.14249-1426
Main Authors: Hoque, Abdul, Huseinov, Artur, Nawarathne, Chaminda P, Alvarez, Noe T
Format: Article
Language:English
Subjects:
Aluminum
Aluminum oxide
Bimetals
Composition
Electrons
Ferric oxide
Hematite
High resolution electron microscopy
High temperature
Iron oxides
Low temperature
Nanoparticles
Nanospheres
Octanol
Photoelectrons
Physical properties
Precursors
Transitional aluminas
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:Bimetallic oxide nanoparticles are promising materials due to their diverse physical properties. Herein, we synthesized bimetallic aluminum oxide (AlO x )-iron oxide (FeO x ) nanoparticles with different shapes and elemental compositions by tuning the low-temperature solvothermal reaction conditions. Bimetallic oxide nanoparticles with three different geometries (nanorice, nanocubes, and nanospheres) were obtained by varying the ratio of aluminum oleate and iron oleate precursors in 1-octanol. The concentration of iron oleate precursor in the reaction medium played an important role for the shape evolution of bimetallic oxide nanoparticles. A detailed understanding of the synthesis process and the physicochemical properties of the synthesized nanoparticles was obtained using various techniques, including high-resolution transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). XRD analysis revealed the presence of hematite (Fe 2 O 3 ) in all nanoparticles, regardless of the shape or size. However, the Al composition of nanoparticles increased as the aluminum oleate precursor concentration was increased in the reaction medium. Furthermore, the as-synthesized bimetallic nanoparticles contained AlO x , which was transformed into γ-Al 2 O 3 and α-Al 2 O 3 following high-temperature annealing, whereas the crystallinity of Fe 2 O 3 was maintained. Synthesis of bimetallic oxide nanorice, nanocube and nanosphere particles made of AlO x -Fe 2 O 3 . The amorphous AlO x goes into phase transformation into γ-Al 2 O 3 and α-Al 2 O 3 at high-temperatures while the crystallinity of Fe 2 O 3 is maintained.
ISSN:1144-0546
1369-9261
DOI:10.1039/d3nj02090h