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Tungsten to oxygen ratio measured by EDX as a function of distance along the tip, before annealing (0 A), and after annealing at 7, 7.5, and 8 A. Error bars show the standard error, and each set has a least squared linear fit overlaid.
Tungsten to oxygen ratio measured by EDX as a function of the tip annealing current, at the end of the tip (0 nm) and at 300 and 750 nm from the tip end. Error bars show standard error.
Tip radius of curvature measured using SEM, before annealing (0 A) and after annealing for 8 s at 6, 7, 7.5, and 8 A. Error bars show the standard error.
SEM images of an aged tip (a) before annealing, and after annealing at currents of (b) 7 A, (c) 7.5 A, and (d) 8 A.
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