Hydrothermal synthesis of flake-flower NiO architectures: Structure, growth and gas-sensing properties

Nanomaterials with hierarchical architectures consisting of two-dimensional nanostructures have attracted considerable attention for their potential applications in recent years. In current work, flake-flower NiO architectures self-assembled by aggregative nanosheets have been successfully synthesiz...

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Veröffentlicht in:Materials letters 2016-05, Vol.171, p.200-203
Hauptverfasser: Miao, Ruiyang, Zeng, Wen
Format: Artikel
Sprache:eng
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Zusammenfassung:Nanomaterials with hierarchical architectures consisting of two-dimensional nanostructures have attracted considerable attention for their potential applications in recent years. In current work, flake-flower NiO architectures self-assembled by aggregative nanosheets have been successfully synthesized via the hydrothermal route. It is notable that the NiO sensors exhibit excellent gas sensing performances owing to the open and well-defined structure as well as abundant micro reaction rooms built by two-dimensional ultrathin nanosheets, which are thinner than the thickness of electron depletion layer. Moreover, a possible growth mechanism for the interactions between PVP and Ni2+ ions in the synthesis of the precursors Ni(OH)2 and the novel morphology evolution of the NiO nanoflowers are proposed in detail. [Display omitted] •Controllable synthesis of flake-flower NiO hierarchical architectures.•NiO sensors exhibit excellent gas sensing performances.•A feasible growth mechanism has been proposal.•The novel morphology evolution of the NiO nanoflowers is presented.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2016.02.052