The present invention includes a method of producing a crystalline metal oxide nanostructure. The method comprises providing a metal salt solution and providing a basic solution; placing a porous membrane between the metal salt solution and the basic solution, wherein metal cations of the metal salt solution and hydroxide ions of the basic solution react, thereby producing a crystalline metal oxide nanostructure.
This invention was made with Government support from the National Science Foundation under CAREER Award DMR-0348239 and the U.S. Department of Energy under Grant No. DE-AC02-98CH10886. The Government has certain rights in this invention.