2013 Spring Symposium
CCP Student Poster Competition Winner
Thomas R. Gordon
Department of Chemistry
University of Pennsylvania
Philadelphia, PA 19104
thomasrgordon@gmail.com
Abstract — Control over faceting in nanocrystals (NCs) is pivotal for many applications, but most notably when investigating catalytic reactions which occur on the surfaces of nanostructures. Titanium dioxide (TiO2) is one of the most studied photocatalysts, but the dependence of its activity on morphology and phase has not yet been satisfactorily investigated, due to a lack of appropriate models. We report the nonaqueous surfactant-assisted synthesis of highly uniform TiO2 NCs with tailorable morphology in the 1–100 nm size régime. Methods are described to engineer the percentage of {001} and {101} facets in anatase and to control the morphology and phase of TiO2 nanorods. The surfactants on the surface of the NCs, which direct growth of uniform particles, may be removed through a simple ligand exchange procedure, allowing for the shape dependence of photocatalytic hydrogen evolution to be studied using monodisperse TiO2 NCs prepared without any high temperature annealing. Such highly uniform nanocrystals may act as model systems to investigate the influence of faceting on a variety of processes under operating conditions.