Matrix phase induced boosting photoactive performance of ZnO nanowire turf‐coated Bi2O3 plate composites

A new nanocomposite consisting of ZnO nanowire turf‐coated Bi2O3 plates was synthesized using a method combining a chemical bath and hydrothermal crystal growth through sputtering ZnO seed layer‐assisted growth. Structural analysis revealed that highly crystalline, high‐density, one‐dimensional (1D)...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2021-10, Vol.104 (10), p.5432-5444
Main Authors: Liang, Yuan‐Chang, Chou, Yu‐Hsun
Format: Article
Language:English
Subjects:
Beta phase
Bismuth oxides
Bismuth trioxide
Characterization
Charge efficiency
composites
Crystal growth
Crystal structure
Crystallography
Density
Heterojunctions
Homojunctions
Hydrothermal crystal growth
microstructure
Morphology
Nanocomposites
Nanowires
oxides
Phase control
Plates
Structural analysis
synthesis
Zinc oxide
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Summary:A new nanocomposite consisting of ZnO nanowire turf‐coated Bi2O3 plates was synthesized using a method combining a chemical bath and hydrothermal crystal growth through sputtering ZnO seed layer‐assisted growth. Structural analysis revealed that highly crystalline, high‐density, one‐dimensional (1D) ZnO crystals were uniformly coated on the organized two‐dimensional (2D) Bi2O3 plates with a single β phase or dual α/β polymorphic phases. The Bi2O3–ZnO composites exhibited enhanced absorption properties in the ultraviolet and visible regions compared with pristine Bi2O3 and ZnO. Furthermore, the Bi2O3–ZnO composites exhibited higher photoactive performance than that of the pristine Bi2O3 and ZnO because of the low recombination rate of photoinduced electron−hole pairs caused by the vectorial transfer of electrons and holes between ZnO and Bi2O3 and the substantially increased surface area of the unique composite morphology. The ZnO nanowire turf‐coated Bi2O3 plates with a α/β‐Bi2O3 matrix exhibited photoelectrochemical and photocatalytic properties superior to those of the composite with a single β‐Bi2O3 matrix. The coexistence of α/β homojunction in the Bi2O3 matrix and the abundant heterojunctions between the ZnO nanowires and Bi2O3 plates substantially enhanced photoexcited charge separation efficiency. Growing high‐density 1D ZnO on 2D Bi2O3 via a combination methodology and crystallographic phase control provided a promising material design route for nanocomposite systems with high photoactivity for photoexcited device applications.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17928