Abstract
We report the self-assembly of core–shell GeTe/Sb2Te3 nanowires (NWs) on Si (100), and SiO2/Si substrates by metalorganic chemical vapour deposition, coupled to the vapour–liquid–solid mechanism, catalyzed by Au nanoparticles. Scanning electron microscopy, X-ray diffraction, micro-Raman mapping, high-resolution transmission electron microscopy, and electron energy loss spectroscopy were employed to investigate the morphology, structure, and composition of the obtained core and core–shell NWs. A single crystalline GeTe core and a polycrystalline Sb2Te3 shell formed the NWs, having core and core–shell diameters in the range of 50–130 nm and an average length up to 7 µm.
Highlights
Interest in chalcogenide nanowires (NWs) continues to grow due to their potential capacity to undergo low energy crystalline-amorphous phase transition [1,2], for several applications such as memory, logic, and sensor devices [3,4,5,6,7,8,9]
The local microstructure, growth direction, and composition were studied by high-resolution transmission electron microscopy (HR-TEM)
We presented a bottom-up approach to synthesize core–shell chalcogenide
Summary
Interest in chalcogenide nanowires (NWs) continues to grow due to their potential capacity to undergo low energy crystalline-amorphous (order-disorder) phase transition [1,2], for several applications such as memory, logic, and sensor devices [3,4,5,6,7,8,9]. The reduction of the operation currents is desirable because it can realize faster amorphization of material with less power consumed and enable higher storage density, faster memory switching, and higher reliability These challenges motivated the researchers to employ bottom-up approaches to synthesize chalcogenide NWs with small diameters [14,15,16].
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