Assembly and Photocarrier Dynamics of Heterostructured Nanocomposite Photoanodes from Multicomponent Colloidal Nanocrystals

• Published in: Nano letters Vol. 15; no. 11; pp. 7347 - 7354
• Main Authors: Loiudice, Anna, Cooper, Jason K, Hess, Lucas H, Mattox, Tracy M, Sharp, Ian D, Buonsanti, R
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 11-11-2015
• Subjects: Assembly; Charge; charge dynamics; colloidal synthesis; Dynamics; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; MATERIALS SCIENCE; Metal oxides; NANOSCIENCE AND NANOTECHNOLOGY; Nanostructure; Oxides; photoelectrochemistry; ternary oxides; Titanium dioxide; Tungsten oxides; assembly; photoelectrochemistry; ternary oxides; Colloidal synthesis; charge dynamics
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/acs.nanolett.5b03871

Multicomponent oxides and their heterostructures are rapidly emerging as promising light absorbers to drive oxidative chemistry. To fully exploit their functionality, precise tuning of their composition and structure is crucial. Here, we report a novel solution-based route to nanostructured bismuth vanadate (BiVO4) that facilitates the assembly of BiVO4/metal oxide (TiO2, WO3, and Al2O3) nanocomposites in which the morphology of the metal oxide building blocks is finely tailored. The combination of transient absorption spectroscopyspanning from picoseconds to second time scalesand photoelectrochemical measurements reveals that the achieved structural tunability is key to understanding and directing charge separation, transport, and efficiency in these complex oxide heterostructured films.