Micrograph of prepared TEM sample coated with electrode patterns. Inset SEM image shows nanowire grown on top of the membrane.
(a) TEM image of W nanowire with an average diameter of 25 nm, inset (i) shows the selective diffraction pattern. (b) Nanowire oxidized for 1 h, inset (i) shows HRTEM image for area A and inset (ii) is the EDX spectrum for area B. (c) and (d) are TEM images of nanowire after oxidation for 4 and 12 h.
(a) Tungsten core diameter and (b) tungsten oxide shell thickness as oxidation progresses.
Stress components in a convex tungsten oxide nanowire structure during oxidation.
Simulated oxide thickness assuming (a) reaction-limited oxidation, and (b) diffusion-limited oxidation compared with experimental data.
Reference values used in simulation.
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