A method of making semiconducting oxide nanowire arrays on such as rutile is disclosed wherein a substrate is heated in the presence of a reaction mixture of non-polar solvent, semi-conductor metal oxide precursor source and strong acid to produce a nanowire array of a semiconducting oxide on the substrate. Dye sensitized solar cells that employ these nanowire arrays also are disclosed.
STATEMENT OF GOVERNMENT INTERESTS
 This invention was made with government support under grants DEFG02-06ER15772 and DEFG36-08601874 awarded by United States Department of Energy. The Government may have certain rights in the invention.