Tungsten Oxide Thin Nanosheets Morphology

Tungsten oxide ultrathin nanosheets obtained by supercritical carbon dioxide. At the beginning of the stripping, smaller nanosheets 5-10 nm in diameter are randomly dispersed and have no significant orientation. Nanosheet lattice spacing 0.37 nm, corresponding to the (120) face of tungsten oxide.

As the reaction progresses, more nanosheets are stripped apart and the smaller nanosheets oriented to reduce their surface energy to form larger nanosheets. After the reaction reaches the final stage, the nanosheets are further two-dimensionally oriented to form two-dimensional nanosheets at 40-50 nm. This growth is called oriented growth. The constituency diffraction illustrates the layered structure of the synthesized tungsten oxide nanosheet.

It can be seen from the figure that the peeled nanosheets have less lamellae and exhibit ultrathin properties. According to the XRD diffraction pattern of tungsten oxide nanosheet and tungstic acid, it can be inferred that the XRD peaks of tungsten oxide nanosheet and tungstic acid all correspond to the orthorhombic tungsten oxide. Compared with tungstic acid, there is no significant change in the positions of the peaks of the tungsten oxide nanosheets, indicating that the tungsten oxide retains its original structure. In addition, tungsten oxide nanosheets no new peak appeared, indicating that the surfactant has been completely removed. This is also confirmed by the FTIR pattern of the tungsten oxide nanosheet. Tungsten oxide samples obtained by stripping only showed the infrared peak of tungsten oxide, and no characteristic peak of surfactant appeared. This result shows that the surfactant and the tungsten oxide nanosheet can be effectively separated at a rotational speed of 20000 rpm.

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