MOCVD Growth of GeTe/Sb2Te3 Core–Shell Nanowires

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 vapour–liquid–solid mechanism, catalyzed Au nanoparticles. Scanning electron microscopy, X-ray diffraction, micro-Raman mapping, high-resolution transmission energy loss spectroscopy were employed investigate morphology, structure, composition obtained core NWs. A single crystalline GeTe a polycrystalline Sb2Te3 shell formed NWs, having diameters in range 50–130 nm an average length up 7 µm.