nl9b02685_si_002.pdf (548.72 kB)
In Situ Atomic-Scale Study on the Ultralarge Bending Behaviors of TiO2–B/Anatase Dual-Phase Nanowires
journal contribution
posted on 2019-10-17, 16:34 authored by Qiong Liu, Haifei Zhan, Huaiyong Zhu, Hongwei Liu, Ziqi Sun, John Bell, Arixin Bo, Yuantong GuIt is challenging
but important to understand the mechanical properties
of one-dimensional (1D) nanomaterials for their design and integration
into nanodevices. Generally, brittle ceramic nanowires (NWs) cannot
withstand a large bending strain. Herein, in situ bending deformation of titanium dioxide (TiO2) NWs with
a bronze/anatase dual-phase was carried out inside a transmission
electron microscopy (TEM) system. An ultralarge bending strain up
to 20.3% was observed on individual NWs. Through an in situ atomic-scale study, the large bending behavior for a dual-phase
TiO2 NW was found to be related to a continuous crystalline-structure
evolution including phase transition, small deformation twinning,
and dislocation nucleation and movements. Additionally, no amorphization
or crack occurred in the dual-phase TiO2 NW even under
an ultralarge bending strain. These results revealed that an individual
ceramic NW can undergo a large bending strain with rich defect activities.