Mechanical bending properties of sodium titanate (Na2Ti3O7) nanowires

作者：Bo Arixin; Zhan Haifei; Bell John; Zhu Huaiyong; Gu Yuantong^*

来源：RSC Advances, 2014, 4(100): 56970-56976.

DOI：10.1039/c4ra11753k

We report on the mechanical properties of sodium titanate nanowires (Na2Ti3O7 NW) through a combination of bending experiments and theoretical analysis. Na2Ti3O7 NWs with lateral dimensions ranging from 20-700 nm were synthesized by a hydrothermal approach. A focused ion beam (FIB) was used to manipulate the selected Na2Ti3O7 NW over a hole drilled in an indium tin oxide substrate. After welding the nanowire, a series of bending tests was performed. It was observed that the Na2Ti3O7 NW exhibits a brittle behavior, and a nonlinear elastic deformation was observed before failure. By using the modified Euler-Bernoulli beam theory, such nonlinear elastic deformation is found to originate from a combination of surface effects and axial elongation (arising from the bending deformation). The effective Young%26apos;s modulus of the Na2Ti3O7 NW was found to be independent of the wire length, and ranges from 21.4 GPa to 45.5 GPa, with an average value of 33 +/- 7 GPa. The yield strength of the Na2Ti3O7 NW is measured at 2.7 +/- 0.7 GPa.

• 出版日期2014