Atomic-Scale Investigation on the Ultra-large Bending Behaviours of Layered Sodium Titanate Nanowires

TL;DR

This study provides atomic-scale insights into the exceptional bending flexibility of layered sodium titanate nanowires, revealing defect behaviors and dislocation dynamics that underpin their mechanical resilience and potential applications.

Contribution

It offers the first atomic-scale analysis of bending properties in layered titanate nanowires, linking defect behavior to their unique mechanical flexibility.

Findings

Nanowires exhibit up to 37% bending strain.

Dislocation arrangements facilitate bending along <100>.

Weak electrostatic interactions enable high flexibility.

Abstract

Study on mechanical properties of one-dimensional layered titanate nanomaterials is crucial since they demonstrate important applications in various fields. Here, we conducted ex situ and in situ atomic-scale investigation on bending properties of a kind of ceramic layered titanate (Na2Ti2O4(OH)2) nanowires in a transmission electron microscopy. The nanowires showed flexibility along <100> direction and could obtain a maximum bending strain of nearly 37%. By analysing the defect behaviours, the unique bending properties of this ceramic material was found to correlate with a novel arrangement of dislocations, an accessible nucleation and movement along the axial direction resulting from the weak electrostatic interaction between the TiO6 layers and the low b/a ratio. These results provide pioneering and key understanding on bending behaviours of layered titanate nanowire families and potentially other one-dimensional nanomaterials with layered crystalline structures.