High Spatial Resolution Assessent of the Structure, Composition, and Electronic Properties of Nanowire Arrays
CALIFORNIA UNIV BERKELEY
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We have employed transmission electron microscopy TEM and analytical electron microscopy to perform preliminary assessment of the structure, composition and electronic properties of nanowire arrays at high spatial resolution. The two systems studied were bismuth and bismuth telluride nanowire arrays in alumina wire diameters 40nm, both of which are promising for thermoelectric applications. Imaging coupled with diffraction in the TEM was employed to determine the grain size in electrodeposited Bi2Te3 nanowires. In addition, a composition gradient was identified along the wires in a short region near the electrode by energy-dispersive x-ray spectroscopy. Electron energy loss spectroscopy combined with energy-filtered imaging in the TEM revealed the excitation energy and spatial variation of plasmons in bismuth nanowire arrays.
- Electrical and Electronic Equipment
- Solid State Physics