We report a facile method for synthesizing single-crystal rutile TiO 2 nanowires using atmospheric-pressure, chemical vapor deposition with Ti and TiO as precursors. The synthesis is found to depend critically on the predeposition of a layer of metallic Ti on the Ni catalysts layer. The omission of this step seems previously to have impeded the efficient synthesis of titania nanowires. Single-nanowire field-effect transistors showed the TiO2 nanowires to be n -type semiconductors with conductance activation energy of ∼58 meV.
Bibliographical noteFunding Information:
J.M.B. and M.H.K. contributed equally to this study. This work was supported by the Institute for Collaborative Biotechnologies through Grant No. DAAD19-03-D-0004 from the U.S. Army Research Office and made extensive use of the MRL Central Facilities at UCSB supported by the National Science Foundation under Award Nos. DMR-0080034 and DMR-0216466 for the HRTEM/STEM microscopy. We gratefully acknowledge the financial support from the Partnership for International Research and Education—for Electronic Chemistry and Catalysis at Interfaces—NSF Grant No. OISE-0530268.