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(a) A typical SEM micrograph of the as-grown nanowires. (b) BF TEM electron micrograph showing morphology of a nanowire.
(a) Enlarged view of a nanowire. (b) A HRTEM micrograph and the corresponding SAD patterns shown in the inset were acquired at the region marked in (a). Single crystalline phase in both matrix and protruding branches were observed.
(a) BF electron micrograph illustrating the region for thickness dependent-chemical mapping. (b) Thickness mapping of the nanowire reveals the structure of 3D branches. Arrows indicate sub-branches stretching out from a main stem protruding out of the matrix.
EELS investigation of the nanowire. (a) valence-loss spectrum, [(b)–(d)] ELNES of Si , N , and O edges.
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