|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Structural Characterizations of Black TiO2 Nanoparticles Made from Amorphous Precursors
||Mengkun Tian, Masoud Mahjouri-Samani, Gyula Eres, Kai Wang, David B. Geohegan, Gerd Duscher
|On-Site Speaker (Planned)
Black Titanium dioxide (TiO2) nanoparticles (NPs) attracted tremendous interest due to the narrowed band gap (~1eV) which allows absorption of whole solar energy, in contrast to the poor absorption of sunlight in the white TiO2 NPs with large band gaps (> 3eV). We synthesized a form of black TiO2 (rutile and anatase) NPs by annealing the amorphous TiO2 (a-TiO2) NPs as precursors synthesized by pulsed laser deposition (PLD) at temperatures ranged from 673K to 973K in Ar gas. A combination of highly spatially resolved transmission electron microscopy (TEM) techniques are used for characterizations. The results show the black rutile NPs have a core-shell structure originating from accumulation of oxygen vacancies expelled toward surface due to crystallization starting from the core. The results suggested that the unique amorphous precursors are the key to form the black TiO2 NPs. These defective and nonstoichiometric TiO2 NPs have great potential application of photocatalysis.
Research supported by U.S. DOE BES-MSED, and performed in part at the CNMS, a DOE Office of Science User Facility.
||Planned: A print-only volume