Direct Growth of W18O49 Nanorods on Tungsten Oxide Films by Rapid-annealing Proces

In the present study, single-crystalline W18O49 nanorods were successfully prepared by annealing sputtered tungsten oxide films in an infrared ray (IR) system. The structural and crystallographic information of the nanorods has been investigated by field-emission scanning electron microscope (FESEM), X-ray diffractometer (XRD), and high-resolution transmission electron microscope (HRTEM). The characterizations indicate that the nanorods are single-crystalline W18O49 with monoclinic phase and have a diameter of 10~15 nm as well as ~300 nm in length. The growth model of the as-obtained nanorods can be explained by solid-solid (SS) process. The present work provides an efficient way for preparing one-dimensional nanomaterials for various applications.