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In this study, we reported a successful synthesis of a nanocomposite based on SnO2 nanoneedles anchored to NiO microsphere by a simple two-step hydrothermal route. The results show that the SnO2/NiO nanocomposite-based sensor exhibits more prominent performances than the pristine NiO microsphere to NO2 such as larger responses and more outstanding repeatability. The improved properties are mainly attributed to the p–n heterojunctions formed at the SnO2–NiO interface, leading to the change of potential barrier height and the enlargement of the depletion layer. Besides, the novel and unique nanostructure provides large and effective areas for the surface reaction. In addition, a plausible growth mechanism and the enhanced sensing mechanism were proposed to further discuss the special nanostructure which will benefit the exploration of high-performance sensors. [ABSTRACT FROM AUTHOR]

The two-dimensional (2D) honeycomb-like nanoplates assembled by nanosheet arrays were synthesized using one-step hydrothermal method and the growth mechanism of this nanostructure was proposed. The sensor based on as-prepared NiO exhibits superior gas-sensing properties to CO. The results verified that the hollow structure of 2D nanoplates could enhance the gas sensing performance by providing sufficient gas diffusion pathways and reaction sites in the gas-sensitive process. • The novel 2D honeycomb-like NiO nanoplates assembled by nanosheet arrays were synthesize. • The possible growth mechanism of the honeycomb-like NiO nanoplates was discussed in detail. • The effect of hollow 2D honeycomb-like nanostructure on gas-sensing properties of NiO nanoplates was discussed. Herein, we successfully prepared the Nickel oxide (NiO) nanomaterials with the structure of two-dimensional (2D) honeycomb-like nanoplates assembled by nanosheet arrays through the hydrothermal synthesis. In addition, the growth mechanism of this unusual nanostructure was proposed. Surprisingly, such NiO nanoplates exhibits superior gas-sensing properties to CO, which is mainly attributed to the hollow structure produced by the arrangement of nanosheets, contributing not only enough gases diffusion pathways but sufficient reaction sites during the gas sensing processes. [ABSTRACT FROM AUTHOR]