Abstract

Novel loosely and tightly arranged nanosheet-assembled flower-like WO3 nanostructures were controllably synthesized via a facile hydrothermal approach. Additionally, NH3-sensing measurements were performed based on both samples. Remarkably, the loosely-arranged WO3 nanostructures, which possess an abundance of semi-closed spaces and a larger specific surface area, exhibited improved NH3-sensing properties compared to that of the tightly-arranged WO3 nanostructures. This discovery can provide guidance for improving the gas-sensing properties of nanosheet-assembled hierarchical MOx flower-like nanostructures.

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