Abstract
Exploration of the mechanisms for growth of the nanostructures is the key point to achieve nanomaterial syntheses with precisely controlled morphology and structure. Herein, we reported a new mechanism that realized the growth of solid conical cap-closing hollow tube by axial screw dislocations in the formation α-Al2O3 nanowires. A hollow tube was firstly grown by axial screw dislocations in the formation α-Al2O3 nanowires through vapor-phase synthesis. Afterwards, the hollow tube was closed up by generating a solid conical cap with axial screw dislocations based on the competition between the surface energy and the strain energy of screw dislocation controlled by the growth environment. The solid conical cap-closing hollow tube growth model based on the axial screw dislocations is expected to be a general growth mechanism for nanowires within low supersaturation. This study enriches the fundamental understanding with respective to the kinetics of nanostructured crystal growth and provides guidance to the precise structure control in nanosynthesis and manufacturing.
Highlights
The fundamental question with respective to how 1D nanomaterials grow has long fascinated scientists
Observation and investigation of the solid conical cap-closing hollow tube growth model by axial screw dislocations enrich our understanding of nanoscale crystal growth mechanisms
The morphology of the products on the as-prepared SiC-Si-Al2O3 ceramics is investigated by scanning electron microscopy (SEM)
Summary
The fundamental question with respective to how 1D nanomaterials grow has long fascinated scientists. The screw dislocation-driven growth mechanism, known as a typical bulk crystal growth model, has been demonstrated as an interpretation for 1D nanomaterial growth. A solid conical cap-closing hollow tube growth mechanism by axial screw dislocations in the formation of α-Al2O3 nanowires is observed. The proposed solid conical cap-closing hollow tube model is driven by axial screw dislocations along the nanowire length. Observation and investigation of the solid conical cap-closing hollow tube growth model by axial screw dislocations enrich our understanding of nanoscale crystal growth mechanisms. This is expected to guide precise structure design in nanosynthesis and manufacturing
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