Nb-Doped Colloidal TiO2 Nanocrystals with Tunable Infrared Absorption

We report a new colloidal synthesis of niobium-doped TiO2 anatase nanocrystals (NCs) that allows for the prepn. of ∼10 nm NCs with control over the amt. of Nb doping up to ∼14%. The incorporation of niobium ions leads to the appearance of a tunable, broad absorption peak that ranges from the visible range to the mid-IR. This optical behavior is attributed to the substitution of Nb5+ on Ti4+ sites generating free carriers inside the conduction band of the TiO2 NCs as supported by optical and ESR spectroscopic investigations. At the same time, the incorporation of progressively more niobium ions drives an evolution of the shape of the NCs from tetragonal platelets to "peanutlike" rods.


Published in:
Chemistry of Materials, 25, 3383-3390
Year:
2013
ISSN:
0897-4756
Keywords:
Laboratories:




 Record created 2016-12-22, last modified 2018-03-17


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