Thermo-oxidative stability of SnO crystals and obtained few layer crystals by mechanical exfoliation

摘要

Stannous oxide (SnO) is prepared by a sol-gel reaction, and the intermediate product is a white gel material, Sn6O4(OH)(4), which is decomposed by a constant temperature heat treatment to form a regular black crystal, and the size reach 300 mu m approximately. TG-DSC analysis shows that under air atmospheric conditions, SnO undergoes an oxidation and thermal decomposition reactions at 350 degrees C, which to form SnO2, Sn, and Sn3O4. With the temperature increasing, the reaction will continue and the final product will be SnO2. X-ray photoelectron spectroscopy (XPS) analysis shows that SnO is sensitive to oxygen. It is placed in air for about 2 months, and 81.8% of the crystal surface is oxidized to SnO2, but the inside of the crystal remains as SnO. Few layer crystal sheets was prepared by mechanical exfoliation with a thickness of 85 nm and a surface roughness of 1.02 nm, which provides a possibility for the application of few layers of SnO crystals to transparent and flexible electronic devices.

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