In situ TEM observation of the growth and decomposition of monoclinic W_(18)O_(49)nanowires

摘要

The growth of monoclinic W_(18)O_(49) nanowires by heat treatment of a tungsten filament at ～873 K and the decomposition of these nanowires under 200 keV electron irradiation at ～1023 K have been investigated using in situ transmission electron microscopy (TEM). In situ TEM observation of the growth confirmed the vapor—solid growth mechanism of the monoclinic W_(18)O_(49) nanowires. In situ irradiation experiments revealed the formation of metallic bcc tungsten from monoclinic W_(18)O_(49) nanowires under 200 keV electron irradiation.