Abstract
Figure Persented: We report on the synthesis of multi-segment nanowire (NW) junctions of Au 1-xGe x and Ge inside the nanochannels of porous anodic aluminum oxide template. The one-dimensional heterostructures are grown with a low-temperature chemical vapor deposition process, assisted by electrodeposited Au nanowires (AuNWs). The Au-catalyzed vapor-liquid-solid growth process occurs simultaneously in multiple locations along the nanochannel, which leads to multi-segment Au 1-xGe x/Ge heterojunctions. The structures of the as-grown hybrid NWs, analyzed by using transmission electron microscopy and energy-dispersive X-ray spectroscopy elemental mapping, show clear compositional modulation with variable modulation period and controllable junction numbers. Remarkably, both GeNW and Au 1-xGe xNW segments are single crystalline with abrupt interfaces and good crystallographic coherences. The electronic and transport properties of individual NW junctions are measured by using a multi-probe scanning tunneling microscope, which confirms the semiconducting nature of Ge segments and the metallic behavior of Au 1-xGe x segments, respectively. The high yield of multiple segment NW junctions of a metal-semiconductor can facilitate the applications in nanoelectronics and optoelectronics that harness multiple functionalities of heterointerfaces.
Original language | English |
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Pages (from-to) | 831-836 |
Number of pages | 6 |
Journal | ACS Nano |
Volume | 6 |
Issue number | 1 |
DOIs | |
State | Published - Jan 24 2012 |
Keywords
- chemical vapor deposition
- electrodeposition
- germanium
- gold
- multiple segment hybrid nanowires