Revisiting Pressure-Induced Transitions in Mesoporous Anatase TiO2
Résumé
Mesoporous materials may be considered as the negative image of a collection of nanoparticles. In both cases, the large surface area induces an increase of the system energy. Pressure-induced phase transitions are used to study the differences between mesoporous TiO 2 and a collection of TiO 2 nanoparticles. The synthesis and characterization of mesoporous TiO 2 with a nanosponge-like structure are presented and the inputs of different spectroscopic techniques (Terahertz, Brillouin and Raman) are highlighted. The results show that the phase stability of mesoporous TiO 2 under pressure is very similar to that observed in nanoparticles. 2
Domaines
Sciences de l'ingénieur [physics]
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20200520HAL.pdf (1.03 Mo)
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20190814JPCCResubSI (1).pdf (200.73 Ko)
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