Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 16, Pages 3383-3390Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm402396c
Keywords
doping titanium oxide; plasmonic nanocrystals; transparent conducting oxide; metal oxide
Funding
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy (DOE) [DE-AC02-05CH11231]
- DOE Early Career Research Program Award
- U.S. National Science Foundation [CHE 1151726, DGE-0718124]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1151726] Funding Source: National Science Foundation
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We report a new colloidal synthesis of niobiumdoped TiO2 anatase nanocrystals (NCs) that allows for the preparation of similar to 10 nm NCs with control over the amount of Nb doping up to similar 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-infrared. 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 electron paramagnetic resonance 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.
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