Abstract
The spin electronic states coupling associated with enhanced photocatalytic activity of TiO2 microstructures annealed in Ar and O2 are designed to explore its ferromagnetism. The samples annealed in Ar show 0.023 emu g−1 magnetic moments related to adsorbed S atom concentration, which is seven times larger than that of samples annealed in O2. Finally, their saturated magnetization decreases sharply as increasing annealing temperature. Spectral analysis and density function theory calculation disclose that the ferromagnetism originates from spin electronic state coupling between adsorbed S atoms and oxygen vacancies as well as magnetic moments disappearing arises from the changes of adsorbed S atom and O vacancy distribution as annealing temperature.
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