Crystal Phases in Hybrid Metal-Semiconductor Nanowire Devices.
J DavidFrancesco RossellaMirko RocciD ErcolaniL SorbaF BeltramM GemmiS RoddaroPublished in: Nano letters (2017)
We investigate the metallic phases observed in hybrid metal-GaAs nanowire devices obtained by controlled thermal annealing of Ni/Au electrodes. Devices are fabricated onto a SiN membrane compatible with transmission electron microscopy studies. Energy dispersive X-ray spectroscopy allows us to show that the nanowire body includes two Ni-rich phases that thanks to an innovative use of electron diffraction tomography can be unambiguously identified as Ni3GaAs and Ni5As2 crystals. The mechanisms of Ni incorporation leading to the observed phenomenology are discussed.
Keyphrases
- electron microscopy
- room temperature
- metal organic framework
- transition metal
- high resolution
- ionic liquid
- reduced graphene oxide
- magnetic resonance imaging
- gold nanoparticles
- magnetic resonance
- computed tomography
- mass spectrometry
- single molecule
- gas chromatography mass spectrometry
- solid phase extraction
- case control
- carbon nanotubes