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(a) TEM image of a Si nanowire grown by the metal-catalyst-free process, (b) image of the tip section of the nanowire denoted by the circle in (a) and (c) EDX spectra of the tip section collected 150 nm from the tip. The peak for Cu is from the grid for TEM. (d) Scanning TEM elemental maps of Si (red) and O (green) concentrations in the nanowire.
