Determination of Mechanical Properties of Single-Crystal CdS Nanowires from Dynamic Flexural Measurements of Nanowire Mechanical Resonators

摘要

The mechanical properties of hexagonal single-crystal CdS nanowires (NWs) were determined by means of dynamic flexural measurements. CdS NWs were fashioned into freely suspended doubly clamped mechanical resonators with lengths varying from 3 to 20μm. A high-frequency response (3-8 MHz) and a high quality factor (500-600) were observed at room temperature. Based on the resonant frequency dependence on the length of the resonator, Young's modulus (~62GPa) and the internal stress (7-30 MPa) were measured. Furthermore, the CdS NW resonators under the conditions of high strain and tension presented nonlinear mechanical responses.