Publication Date:
2014-10-02
Description:
In this paper, we studied how field emission from thermally evaporated W 18 O 49 nanowires depended on temperature. As the temperature changed from 300 K to 723 K, we found anomalous changes in emission current. Below an applied field of ∼12.5 V μ m −1 , the emission current tended to increase with rising temperature, while above 12.5 V μ m −1 the current depended less on temperature in the range of 573–723 K. Furthermore, at high temperatures, we found the Fowler-Nordheim plots of these nanowires to be nonlinear. We believe that the anomalous behavior is associated with surface states at low fields and field penetration at high fields.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics