Abstract
We report the synthesis of tungsten oxide (WO3) nanosheets using a simple yet efficient hydrothermal technique free of surfactantand template. The WO3 nano-sheets are self-assembled as well to form ordered one-dimensional chain nanostructure. A comprehensive microscopic characterization reveals that the nano-sheets have triangular and circular two different shape edges, dislocation and stacking faults are also observed, which should have implications for our understanding of catalytic activity of ceria. We also propose a growth mechanism for the nano-sheets. As a result of this unique morphology, this WO3 nano-sheets are found to show excellent gas-sensing properties which can use as promising sensor materials detecting ethanol with low concentration.
Highlights
Tungsten trioxide WO3 nanomaterials are extensively applied in electrochromic device, gas sensor and photocatalysts filed (Hai et al, 2016; Zhang et al, 2018)
Here,we report the WO3 nano-sheets with highly self-assembled architecture synthesized via the hydrothermal synthesis process
Two different direction edge dislocations: positive edge dislocation (Figure 1h) and negative edge dislocation (Figure 1i) are deteced by the HR-TEM, which should be critical for the properties of WO3
Summary
Tungsten trioxide WO3 nanomaterials are extensively applied in electrochromic device, gas sensor and photocatalysts filed (Hai et al, 2016; Zhang et al, 2018). The WO3 nanoparticles with avariety of morphologies (such as nanowires, nano-rods, nano-plate, nano-spheres and so on) have been syhthesized successfully via highintensity ultrasound, rapid microwave, hydrothermal synthesis and other methods (Chai et al, 2016, Hu et al, 2017a, Xu et al, 2017; Chen et al, 2018; Parthibavarman et al, 2018; Zhan et al, 2018). Among all of those applied methods, hydrothermal synthesis technique has been concerned due to the merits of simple operation, low energy consumption, the possibility for large-scale industrialization and so on. In addtion,we test the response and selectivity of the sensor fabricated from the WO3 nano-sheets
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