Abstract
The van der Waals α-MoO3 is one of the most attracted two-dimensional metal oxides in opto-electronics Thermal stability is one of the key properties in device application. Here, the thermal decomposition of individual α-MoO3 nanosheet was investigated using in-situ microscope and Raman spectroscopy. It’s found that the nanosheet decomposes above 400 °C. Three decomposition behaviors, including void decomposition, edge decomposition and layer-by-layer decomposition were found. The Oa atom is the most unstable oxygen atom that causes a preferential decomposition along the [0 0 1] direction. Thermal stress accumulated in the [1 0 0] direction leads to a non-linear temperature dependent Raman shifting.
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