Related Experiment Video
Updated: May 9, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Catalyst composition and impurity-dependent kinetics of nanowire heteroepitaxy
Andrew D Gamalski1, Daniel E Perea, Jinkyoung Yoo
1Department of Engineering, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
Abstract:
The mechanisms and kinetics of axial Ge-Si nanowire heteroepitaxial growth based on the tailoring of the Au catalyst composition via Ga alloying are studied by environmental transmission electron microscopy combined with systematic ex situ CVD calibrations. The morphology of the Ge-Si heterojunction, in particular, the extent of a local, asymmetric increase in nanowire diameter, is found to depend on the Ga composition of the catalyst, on the TMGa precursor exposure temperature, and on the presence of dopants. To rationalize the findings, a general nucleation-based model for nanowire heteroepitaxy is established which is anticipated to be relevant to a wide range of material systems and device-enabling heterostructures.
Related Concept Videos
Heterogeneous Catalysis
Catalysis
Catalysis

